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can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="code-search-feedback-form" data-action="click:qbsearch-input#submitFeedback" type="submit" data-view-component="true" class="btn-primary btn"> Submit feedback </button> </div> </dialog></dialog-helper> <custom-scopes data-target="qbsearch-input.customScopesManager"> <dialog-helper> <dialog data-target="custom-scopes.customScopesModalDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="custom-scopes-dialog" aria-modal="true" aria-labelledby="custom-scopes-dialog-title" aria-describedby="custom-scopes-dialog-description" 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track?","anchor":"which-cpython-branches-would-el-python-track","htmlText":"Which CPython branches would EL Python track?"},{"level":1,"text":"Who would have merge permissions for EL Python branches?","anchor":"who-would-have-merge-permissions-for-el-python-branches","htmlText":"Who would have merge permissions for EL Python branches?"},{"level":1,"text":"How would EL Python versions be identified?","anchor":"how-would-el-python-versions-be-identified","htmlText":"How would EL Python versions be identified?"},{"level":1,"text":"What does \"no mandatory file regeneration\" mean?","anchor":"what-does-no-mandatory-file-regeneration-mean","htmlText":"What does \"no mandatory file regeneration\" mean?"},{"level":1,"text":"How would EL Python be expected to affect the testing matrix for community Python projects?","anchor":"how-would-el-python-be-expected-to-affect-the-testing-matrix-for-community-python-projects","htmlText":"How would EL Python be expected to affect the testing matrix for community Python projects?"},{"level":1,"text":"What is the proposed relationship with CPython?","anchor":"what-is-the-proposed-relationship-with-cpython","htmlText":"What is the proposed relationship with CPython?"},{"level":1,"text":"How else would EL Python differ from CPython?","anchor":"how-else-would-el-python-differ-from-cpython","htmlText":"How else would EL Python differ from CPython?"},{"level":1,"text":"What is the proposed relationship with the PSF?","anchor":"what-is-the-proposed-relationship-with-the-psf","htmlText":"What is the proposed relationship with the PSF?"},{"level":1,"text":"What Code of Conduct would the project use?","anchor":"what-code-of-conduct-would-the-project-use","htmlText":"What Code of Conduct would the project use?"},{"level":1,"text":"How would the CoC be enforced?","anchor":"how-would-the-coc-be-enforced","htmlText":"How would the CoC be enforced?"},{"level":1,"text":"What are the alternatives to pursuing the EL Python idea?","anchor":"what-are-the-alternatives-to-pursuing-the-el-python-idea","htmlText":"What are the alternatives to pursuing the EL Python idea?"},{"level":1,"text":"What about Python 2?","anchor":"what-about-python-2","htmlText":"What about Python 2?"}],"lineInfo":{"truncatedLoc":"318","truncatedSloc":"242"},"mode":"file"},"image":false,"isCodeownersFile":null,"isPlain":false,"isValidLegacyIssueTemplate":false,"issueTemplate":null,"discussionTemplate":null,"language":"Markdown","languageID":222,"large":false,"planSupportInfo":{"repoIsFork":null,"repoOwnedByCurrentUser":null,"requestFullPath":"/elpython/elpython-meta/blob/master/README.md","showFreeOrgGatedFeatureMessage":null,"showPlanSupportBanner":null,"upgradeDataAttributes":null,"upgradePath":null},"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_dockerfile","releasePath":"/elpython/elpython-meta/releases/new?marketplace=true","showPublishActionBanner":false},"rawBlobUrl":"https://github.com/elpython/elpython-meta/raw/refs/heads/master/README.md","renderImageOrRaw":false,"richText":"\u003carticle class=\"markdown-body entry-content container-lg\" itemprop=\"text\"\u003e\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat is EL Python?\u003c/h1\u003e\u003ca id=\"user-content-what-is-el-python\" class=\"anchor\" aria-label=\"Permalink: What is EL Python?\" href=\"#what-is-el-python\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eRight now, EL Python is just an idea in a README in a GitHub repo.\nWhether it will ever become more than that remains to be seen :)\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat is the idea?\u003c/h1\u003e\u003ca id=\"user-content-what-is-the-idea\" class=\"anchor\" aria-label=\"Permalink: What is the idea?\" href=\"#what-is-the-idea\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eEL Python would be a CPython 3.x variant tailored for Enterprise Lifecycles. It would exist as a venue for\npaid developers working for commercial redistributors and other organisations to collaborate on:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003emaintenance branches with even stricter backwards compatibility requirements than regular CPython\nmaintenance branches\u003c/li\u003e\n\u003cli\u003elong-lived maintenance branches that permit feature and performance improvement backports from\nlater CPython feature releases\u003c/li\u003e\n\u003cli\u003efeatures of interest to enterprise Python users where it isn't clear yet if the associated maintenance\nburdens will be low enough for the CPython community project to reasonably accept\u003c/li\u003e\n\u003cli\u003eprovisional availability of new features that have been accepted for a future CPython feature release,\nbut not yet published by the upstream project\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eBy defining EL Python as a separate project from CPython, we'd be able to make it clear that we\n\u003cem\u003edon't\u003c/em\u003e consider it reasonable to ask volunteer community contributors to invest their personal time\nin meeting the needs of large enterprise organisations, but we \u003cem\u003edo\u003c/em\u003e consider it reasonable for\ncommercial Python redistributors and other organisations using Python to invest in providing a\nCPython variant that promises:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003enear zero churn-related compatibility breaks in maintenance releases\u003c/li\u003e\n\u003cli\u003ethe availability of selected new features from later language versions without requiring\nchanges to file installation layouts, mandatory rebuilds of extension modules or\nregeneration of \u003ccode\u003epyc\u003c/code\u003e files\u003c/li\u003e\n\u003cli\u003esupport for complex interpreter level features that are clearly beneficial for production\ninfrastructure in large enterprise organisations, but may be of more questionable value in the\ncontext of smaller organisations, educational use cases, or research \u0026amp; development activities\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow would this idea be pursued?\u003c/h1\u003e\u003ca id=\"user-content-how-would-this-idea-be-pursued\" class=\"anchor\" aria-label=\"Permalink: How would this idea be pursued?\" href=\"#how-would-this-idea-be-pursued\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf this idea ends up being pursued further, then this README would be redrafted in the form of\na Python Enhancement Proposal and submitted to python-dev for consideration.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eActually taking that step would be conditional on credible commitments of full-time developer\nsupport from interested commercial Python redistributors and other organisations :)\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow often would new EL Python releases happen?\u003c/h1\u003e\u003ca id=\"user-content-how-often-would-new-el-python-releases-happen\" class=\"anchor\" aria-label=\"Permalink: How often would new EL Python releases happen?\" href=\"#how-often-would-new-el-python-releases-happen\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eEL Python releases would be made on a six-monthly cadence, with the releases deliberately\ntimed to align with the development schedules of the Fedora and Ubuntu Linux distributions.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eTypical Ubuntu release dates: April, October\u003c/li\u003e\n\u003cli\u003eTypical Ubuntu feature freeze dates: February, August\u003c/li\u003e\n\u003cli\u003eTypical Fedora release dates: May, October\u003c/li\u003e\n\u003cli\u003eTypical Fedora feature freeze dates: March, September\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eGiven those dates, the target dates for EL Python releases would be the final week of January\nand the final week of July each year.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhich CPython branches would EL Python track?\u003c/h1\u003e\u003ca id=\"user-content-which-cpython-branches-would-el-python-track\" class=\"anchor\" aria-label=\"Permalink: Which CPython branches would EL Python track?\" href=\"#which-cpython-branches-would-el-python-track\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBy default, there would be an EL Python maintenance branch for each CPython maintenance\nbranch. These branches would all include a core set of patches that:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eadded the EL Python version and variant information\u003c/li\u003e\n\u003cli\u003eadded any EL-Python-only features that had not yet been approved for inclusion in\nthe CPython reference implementation (the ideal size of this patch set is for it to\nbe empty, but it may be non-empty due to features that offer clear value to enterprise\nusers, where python-dev is nevertheless collectively skeptical as to the value for\nbroader audiences)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eEach branch would also include a set of approved backports from later CPython maintenance and feature releases.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn addition, at the EL Python maintainers' discretion, some EL Python maintenance branches\nmay be defined as LTS branches, which would live on beyond the mainstream EOL of the\ncorresponding CPython branches.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWho would have merge permissions for EL Python branches?\u003c/h1\u003e\u003ca id=\"user-content-who-would-have-merge-permissions-for-el-python-branches\" class=\"anchor\" aria-label=\"Permalink: Who would have merge permissions for EL Python branches?\" href=\"#who-would-have-merge-permissions-for-el-python-branches\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAt least initially, EL Python merge permissions would be restricted to staff working\nfor commercial redistributors and other organisations formally participating in the\nEL Python effort (where the exact nature of \"formal participation\" would be defined\nin collaboration with the Python Software Foundation).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis is due to the fact that the proposed differences in maintenance policies between\nEL Python and CPython are driven almost entirely by commercial and enterprise support\nrequirements, which gives EL Python a strongly business-driven character that isn't the\ncase for the more egalitarian, community-driven, CPython project.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt's expected that this restriction would eventually be dropped - it's just a\nsimplfying community management assumption to start out with.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow would EL Python versions be identified?\u003c/h1\u003e\u003ca id=\"user-content-how-would-el-python-versions-be-identified\" class=\"anchor\" aria-label=\"Permalink: How would EL Python versions be identified?\" href=\"#how-would-el-python-versions-be-identified\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt is proposed that EL Python versions be identified through a combination of semantic versioning\nand calendar versioning:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eSemVer (X.Y.Z) for the base CPython version (e.g. 3.6.2)\u003c/li\u003e\n\u003cli\u003eCalVer plus a patch release serial number (YY.MM.N) for EL Python releases (e.g. 18.01.0)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThis information will be reported as:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003esys.version_info\u003c/code\u003e -\u0026gt; \u003ccode\u003esys.version_info(major=3, minor=6, micro=2, releaselevel='final', serial=0)\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esys.hex_version\u003c/code\u003e -\u0026gt; \u003ccode\u003e0x30602f0\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esys.implementation.version\u003c/code\u003e -\u0026gt; \u003ccode\u003esys.version_info(major=18, minor=1, micro=0, releaselevel='final', serial=0)\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esys.implementation.hexversion\u003c/code\u003e -\u0026gt; \u003ccode\u003e0x120100f0\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esys.version\u003c/code\u003e -\u0026gt; \u003ccode\u003e3.6.2.18.01.0 (... other build details ...)\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eTo maximise backwards compatibility (and to ensure that otherwise CPython specific test cases\nare run), \u003ccode\u003esys.implementation.name\u003c/code\u003e will be reported as \u003ccode\u003e\"cpython\"\u003c/code\u003e in EL Python\nbranches, and the default CPython \u003ccode\u003esys.implementation.cache_tag\u003c/code\u003e will also be re-used.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eEven if no other markers were added, this would be sufficient to allow CPython and EL Python\nbuilds to be fairly reliably distinguished based on:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"impl = sys.implementation\nif impl.name == 'cpython':\n if impl.version == sys.version_info:\n print(\u0026quot;CPython\u0026quot;)\n else:\n print(\u0026quot;EL Python\u0026quot;)\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eimpl = sys.implementation\nif impl.name == 'cpython':\n if impl.version == sys.version_info:\n print(\"CPython\")\n else:\n print(\"EL Python\")\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHowever, as a more robust marker that also allows for identification of other CPython\nvariants, an additional implementation-specific field, \u003ccode\u003evariant\u003c/code\u003e would be added:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003esys.implementation.variant\u003c/code\u003e -\u0026gt; \u003ccode\u003eelpython\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThis would be proposed as a new standard \u003ccode\u003esys.implementation\u003c/code\u003e field for Python\n3.9+ (defaulting to \u003ccode\u003ereference\u003c/code\u003e for reference implementations, such as CPython\nitself for the \u003ccode\u003esys.implementation.name == 'cpython'\u003c/code\u003e case).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eRedistributors would be encouraged to always set it appropriately to help\nidentify their particular builds (using the \u003ccode\u003eelpython-\u003c/code\u003e prefix for EL Python\nrebuilds).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat does \"no mandatory file regeneration\" mean?\u003c/h1\u003e\u003ca id=\"user-content-what-does-no-mandatory-file-regeneration-mean\" class=\"anchor\" aria-label=\"Permalink: What does \u0026quot;no mandatory file regeneration\u0026quot; mean?\" href=\"#what-does-no-mandatory-file-regeneration-mean\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMigrating to a new CPython feature release necessarily means doing the following:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ereinstalling all components installed into \u003ccode\u003esite-packages\u003c/code\u003e to account for the new directory name\u003c/li\u003e\n\u003cli\u003eregenerating all pyc files to use the new compatibility tag and (typically) magic number\u003c/li\u003e\n\u003cli\u003erebuilding any extension modules that targeted the regular CPython C API, rather than the limited\nAPI that offers greater assurances of ABI stability across feature releases\u003c/li\u003e\n\u003cli\u003eregenerating all version-specific wheel files using the new version compatibility tag\u003c/li\u003e\n\u003cli\u003erefreshing all virtual environments to account for the change in the path of \u003ccode\u003esite-packages\u003c/code\u003e,\nany changes to the standard library layout, and for the changes to \u003ccode\u003epyc\u003c/code\u003e file and extension module\nnaming schemes\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThese updates are required even if the affected software is otherwise entirely compatible with both\nruntime versions at a source code level.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \"no mandatory rebuilds or file regeneration\" requirement means that:\u003c/p\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003eAny EL Python branch will \u003cem\u003ealways\u003c/em\u003e support the filesystem layout of the corresponding CPython\nX.Y.Z release\u003c/li\u003e\n\u003cli\u003eAny EL Python branch will \u003cem\u003ealways\u003c/em\u003e support loading \u003ccode\u003epyc\u003c/code\u003e files and extension modules named with\nthe compatibility tags for the corresponding CPython X.Y.Z release\u003c/li\u003e\n\u003cli\u003eAny EL Python branch will \u003cem\u003ealways\u003c/em\u003e support installing wheel files using the compatibility tags\nfor the corresponding CPython X.Y.Z release\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp dir=\"auto\"\u003eFeatures and fixes will thus only be considered as potential backport candidates from CPython to\nEL Python if either:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ethe original change didn't require an update to the filesystem layout or any of the file\ncompatibility tags; or\u003c/li\u003e\n\u003cli\u003ean alternate (potentially harder to maintain) implementation is available that doesn't require\nan update to the filesystem layout or any of the file compatibility tags; or\u003c/li\u003e\n\u003cli\u003ethe feature is deemed valuable enough to justify the complexity of enhancing EL Python itself\nto support new, EL Python specific, file compatibility tags, without losing support for the\ncorresponding CPython X.Y.Z compatibility tags\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow would EL Python be expected to affect the testing matrix for community Python projects?\u003c/h1\u003e\u003ca id=\"user-content-how-would-el-python-be-expected-to-affect-the-testing-matrix-for-community-python-projects\" class=\"anchor\" aria-label=\"Permalink: How would EL Python be expected to affect the testing matrix for community Python projects?\" href=\"#how-would-el-python-be-expected-to-affect-the-testing-matrix-for-community-python-projects\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAny software tested against a given CPython X.Y.Z release would be expected to work unmodified on the\ncorresponding EL Python branch. Software tested against a later CPython X.Y.Z+ release would normally\nbe expected to work against the corresponding EL Python release, as long as it was not impacted by\nany bugs that had been fixed in CPython, but the fix hadn't been backported due to backwards\ncompatibility concerns that were deemed acceptable for CPython, but not for EL Python.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis means that for projects which already promptly drop support for older CPython versions when\nnew feature releases become available, or when a given maintenance branch is no longer receiving\nsecurity updates, EL Python should have no impact on the typical testing matrix (and this is\nconsidered a desirable outcome).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhere EL Python may potentially become an interesting testing target for Python community projects\nis in the following cases:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ewhen a given CPython maintenance branch is no longer receiving security updates, some projects\nmay choose to start testing against the corresponding EL Python branch instead of completely\ndropping support for that version (assuming that an EL Python branch exists for that version\nwith a longer lifecycle than the regular CPython one - as noted above, that will only be the\ncase for selected branches)\u003c/li\u003e\n\u003cli\u003ewhen a project wants or needs to adopt a feature from a later CPython release, and that feature\nhas been backported to EL Python, some projects may choose to switch to only supporting the\nEL Python variant of that older release, and not the regular CPython release\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThe goal of this approach is that the existence of EL Python should never \u003cem\u003eincrease\u003c/em\u003e the testing\nburden for any community project - if EL Python is added to a testing matrix, it should typically\nbe accompanied by the \u003cem\u003eremoval\u003c/em\u003e of the corresponding CPython branch (either because that branch is\nno longer receiving security updates, or because it lacks a feature the project is now relying on).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBy contrast, both previous proposals for making new CPython features available to end users without\nwaiting for the next CPython feature release had the side effect of potentially significantly\nexpanding build \u0026amp; test matrices for community projects (see the deferred\n\u003ca href=\"https://www.python.org/dev/peps/pep-0407/\" rel=\"nofollow\"\u003ePEP 407\u003c/a\u003e and the withdrawn\n\u003ca href=\"https://www.python.org/dev/peps/pep-0413/\" rel=\"nofollow\"\u003ePEP 413\u003c/a\u003e for details)\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat is the proposed relationship with CPython?\u003c/h1\u003e\u003ca id=\"user-content-what-is-the-proposed-relationship-with-cpython\" class=\"anchor\" aria-label=\"Permalink: What is the proposed relationship with CPython?\" href=\"#what-is-the-proposed-relationship-with-cpython\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cem\u003eAll\u003c/em\u003e functional changes to EL Python should either appear in CPython first, or else be covered by a\ndraft PEP or feature request that has been submitted for consideration for a future version of CPython,\nand \u003cem\u003epython-dev\u003c/em\u003e has made the determination that it is suitable for inclusion as an EL Python feature,\npending further consideration as a potential mainline CPython feature.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo ensure the absence of churn-related compatibility breaks in EL Python maintenance releases,\nEL Python may also end up including opt-in behaviour toggles that don't appear in regular CPython\nfeature releases (see PEP 493 for some examples of this kind of toggle related to backporting\nthe PEP 476 change to always verify HTTPS certificates by default).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo allow for transparent upgrades from a regular CPython build to EL Python, the directory paths\nused in EL Python would necessarily be fully compatible with those used by CPython (e.g. the \u003ccode\u003e/usr/lib\u003c/code\u003e\nand \u003ccode\u003e/usr/lib\u003c/code\u003e subdirectories would still be called \u003ccode\u003epythonX.Y\u003c/code\u003e). However, EL Python may also\nadd additional EL Python specific directories that a regular CPython build will ignore.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow else would EL Python differ from CPython?\u003c/h1\u003e\u003ca id=\"user-content-how-else-would-el-python-differ-from-cpython\" class=\"anchor\" aria-label=\"Permalink: How else would EL Python differ from CPython?\" href=\"#how-else-would-el-python-differ-from-cpython\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOne big difference would be that EL Python would be a source-only project: it would \u003cem\u003enot\u003c/em\u003e provide\nany prebuilt binary installers for any platform. Instead, the expectation would be that\nredistributors and end users would take the project and produce their own binaries in the formats\nof interest to them.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn addition, while EL Python would transparently consume pyc files, extension modules and wheel\nfiles built for CPython, and would default to emitting CPython compatible versions of such\nfiles, a mechanism would need to be provided for publishers to indicate when their\nartifacts were EL Python specific (e.g. when they're depending on a feature backported from\na later CPython release).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat is the proposed relationship with the PSF?\u003c/h1\u003e\u003ca id=\"user-content-what-is-the-proposed-relationship-with-the-psf\" class=\"anchor\" aria-label=\"Permalink: What is the proposed relationship with the PSF?\" href=\"#what-is-the-proposed-relationship-with-the-psf\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe'd like EL Python to be a PSF backed project, just like CPython, and contributors to EL Python\nwould be required to sign the CPython CLA before their contributions can be accepted.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe'd also expect any formal participation agreements to be worked out in collaboration with\nthe PSF, rather than directly between participating organisations.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat Code of Conduct would the project use?\u003c/h1\u003e\u003ca id=\"user-content-what-code-of-conduct-would-the-project-use\" class=\"anchor\" aria-label=\"Permalink: What Code of Conduct would the project use?\" href=\"#what-code-of-conduct-would-the-project-use\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eEL Python would operate under the Contributor Covenant: \u003ca href=\"https://www.contributor-covenant.org/\" rel=\"nofollow\"\u003ehttps://www.contributor-covenant.org/\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow would the CoC be enforced?\u003c/h1\u003e\u003ca id=\"user-content-how-would-the-coc-be-enforced\" class=\"anchor\" aria-label=\"Permalink: How would the CoC be enforced?\" href=\"#how-would-the-coc-be-enforced\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eInitially, by the folks with merge privileges, with their respective employers and the PSF\nBoard available as potential paths of escalation for any CoC concerns relating to the project\nmaintainers themselves. EL Python would also respect any existing org-wide bans from PSF\nprovided communication channels.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eEventually, as the PSF defines clearer processes for reporting of CoC concerns for the\nprojects it oversees, EL Python would explicitly opt in to being covered by that process.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat are the alternatives to pursuing the EL Python idea?\u003c/h1\u003e\u003ca id=\"user-content-what-are-the-alternatives-to-pursuing-the-el-python-idea\" class=\"anchor\" aria-label=\"Permalink: What are the alternatives to pursuing the EL Python idea?\" href=\"#what-are-the-alternatives-to-pursuing-the-el-python-idea\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHistorically, redistributors (most notably Red Hat, as part of Red Hat Enterprise Linux) have\noffered long term commercial support for CPython simply by choosing a particular CPython X.Y.Z\nrelease, and then offering that specific version for an extended period of time, focusing\nmainly on security fixes, backports of requested bug fixes, and occasionally backports of\nsmaller features (e.g. backporting \u003ccode\u003ecollections.OrderedDict\u003c/code\u003e from Python 2.7 to Python 2.6\nin RHEL \u0026amp; CentOS 6).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAn example of this approach can be seen by looking at the patch set for Python 2.7 in CentOS 7,\nwhich relies on selective backports atop 2.7.5 rather than rebasing outright to upstream\nmaintenance releases: \u003ca href=\"https://git.centos.org/rpms/python/blob/c7/f/SOURCES\" rel=\"nofollow\"\u003ehttps://git.centos.org/rpms/python/blob/c7/f/SOURCES\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eUnfortunately, while this approach does address the key concern of providing a stable,\nlong-lived foundation for enterprise developers to build on, many other aspects of the\nrelated developer experience are considered highly undesirable:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eenterprise developers targeting these long term support releases miss out on even fully\nbackwards compatible enhancements added in later CPython feature releases, reducing\nthe incentive for their employers to contribute to CPython maintenance \u0026amp; feature\ndevelopment (whether directly or indirectly via a commercial redistributor)\u003c/li\u003e\n\u003cli\u003eenhancements to the language, reference implementation and standard library often take\nyears to see truly broad adoption, as libraries and frameworks maintaining compatibility\nwith these older CPython releases are also often unable to adopt them, even if the project\nmaintainers themselves are regularly upgrading to newer CPython releases. (See\n\u003ca href=\"https://alexgaynor.net/2015/mar/30/red-hat-open-source-community/\" rel=\"nofollow\"\u003ethis 2015 post\u003c/a\u003e from\nAlex Gaynor, and\n\u003ca href=\"http://www.curiousefficiency.org/posts/2015/04/stop-supporting-python26.html\" rel=\"nofollow\"\u003ethis reply\u003c/a\u003e\nfrom Nick Coghlan for further discussion of that problem)\u003c/li\u003e\n\u003cli\u003ethe developers \u003cem\u003emaintaining\u003c/em\u003e these long term support branches are currently working in\norganisation specific silos, making it difficult to ensure cross-platform consistency in\nthe resulting Python developer experience\u003c/li\u003e\n\u003cli\u003eeven when selected features \u003cem\u003eare\u003c/em\u003e backported to these existing LTS releases, this isn't\ncommunicated in a clear and consistent way, so Python developers may not be aware they\ncan rely on those features being present on the platforms they care about\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThe EL Python concept arose from asking the question of how we might effectively address\nthe established commercial demand for a long term support variant of CPython in a way that:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003edoesn't result in an inherently poor developer experience when targeting long-term support\nversions (especially later in their lifecycle)\u003c/li\u003e\n\u003cli\u003emakes long term support versions (almost) as easy to develop and test against as regular\nCPython releases\u003c/li\u003e\n\u003cli\u003ereduces the risk of fragmenting the Python developer experience across different competing\nlong term support vendors\u003c/li\u003e\n\u003cli\u003emakes it clear that offering long term support is considered the domain of professional\nsoftware developers that are getting paid to meet that obligation, rather than something\nthat can reasonably be expected of community volunteers\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eIt is based in large part on the three tiered concept of \"development\", \"stable\", and\n\"long term\" kernels in the Linux kernel development process:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003edevelopment kernels -\u0026gt; CPython development branch\u003c/li\u003e\n\u003cli\u003estable kernels -\u0026gt; CPython maintenance branches, short term EL Python maintenance branches\u003c/li\u003e\n\u003cli\u003elong term kernels -\u0026gt; long term EL Python maintenance branches\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat about Python 2?\u003c/h1\u003e\u003ca id=\"user-content-what-about-python-2\" class=\"anchor\" aria-label=\"Permalink: What about Python 2?\" href=\"#what-about-python-2\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhile EL Python itself is being proposed as a Python 3 only project, the \u003ccode\u003etauthon\u003c/code\u003e project is\nalready pursuing a similar concept for Python 2.7: \u003ca href=\"https://github.com/naftaliharris/tauthon\"\u003ehttps://github.com/naftaliharris/tauthon\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cem\u003eIf\u003c/em\u003e EL Python were to ever gain a Python 2.7 branch, it would only be in the form of a post-2020\nsecurity-fix branch (including network security stack upgrades), rather than the kind of feature\nbackport branch being proposed for 3.x releases.\u003c/p\u003e\n\u003c/article\u003e","renderedFileInfo":null,"shortPath":null,"symbolsEnabled":true,"tabSize":8,"topBannersInfo":{"overridingGlobalFundingFile":false,"globalPreferredFundingPath":null,"showInvalidCitationWarning":false,"citationHelpUrl":"https://docs.github.com/github/creating-cloning-and-archiving-repositories/creating-a-repository-on-github/about-citation-files","actionsOnboardingTip":null},"truncated":false,"viewable":true,"workflowRedirectUrl":null,"symbols":{"timed_out":false,"not_analyzed":false,"symbols":[{"name":"What is EL Python?","kind":"section_1","ident_start":2,"ident_end":20,"extent_start":0,"extent_end":155,"fully_qualified_name":"What is EL 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style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path></svg></button></div></div></div></div><div></div></div><div class="Box-sc-g0xbh4-0 hGyMdv"><section aria-labelledby="file-name-id-wide file-name-id-mobile" class="Box-sc-g0xbh4-0 fGqKFv"><div class="Box-sc-g0xbh4-0 eoaCFS js-snippet-clipboard-copy-unpositioned undefined" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">What is EL Python?</h1><a id="user-content-what-is-el-python" class="anchor" aria-label="Permalink: What is EL Python?" href="#what-is-el-python"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Right now, EL Python is just an idea in a README in a GitHub repo. Whether it will ever become more than that remains to be seen :)</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">What is the idea?</h1><a id="user-content-what-is-the-idea" class="anchor" aria-label="Permalink: What is the idea?" href="#what-is-the-idea"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">EL Python would be a CPython 3.x variant tailored for Enterprise Lifecycles. It would exist as a venue for paid developers working for commercial redistributors and other organisations to collaborate on:</p> <ul dir="auto"> <li>maintenance branches with even stricter backwards compatibility requirements than regular CPython maintenance branches</li> <li>long-lived maintenance branches that permit feature and performance improvement backports from later CPython feature releases</li> <li>features of interest to enterprise Python users where it isn't clear yet if the associated maintenance burdens will be low enough for the CPython community project to reasonably accept</li> <li>provisional availability of new features that have been accepted for a future CPython feature release, but not yet published by the upstream project</li> </ul> <p dir="auto">By defining EL Python as a separate project from CPython, we'd be able to make it clear that we <em>don't</em> consider it reasonable to ask volunteer community contributors to invest their personal time in meeting the needs of large enterprise organisations, but we <em>do</em> consider it reasonable for commercial Python redistributors and other organisations using Python to invest in providing a CPython variant that promises:</p> <ul dir="auto"> <li>near zero churn-related compatibility breaks in maintenance releases</li> <li>the availability of selected new features from later language versions without requiring changes to file installation layouts, mandatory rebuilds of extension modules or regeneration of <code>pyc</code> files</li> <li>support for complex interpreter level features that are clearly beneficial for production infrastructure in large enterprise organisations, but may be of more questionable value in the context of smaller organisations, educational use cases, or research & development activities</li> </ul> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">How would this idea be pursued?</h1><a id="user-content-how-would-this-idea-be-pursued" class="anchor" aria-label="Permalink: How would this idea be pursued?" href="#how-would-this-idea-be-pursued"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If this idea ends up being pursued further, then this README would be redrafted in the form of a Python Enhancement Proposal and submitted to python-dev for consideration.</p> <p dir="auto">Actually taking that step would be conditional on credible commitments of full-time developer support from interested commercial Python redistributors and other organisations :)</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">How often would new EL Python releases happen?</h1><a id="user-content-how-often-would-new-el-python-releases-happen" class="anchor" aria-label="Permalink: How often would new EL Python releases happen?" href="#how-often-would-new-el-python-releases-happen"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">EL Python releases would be made on a six-monthly cadence, with the releases deliberately timed to align with the development schedules of the Fedora and Ubuntu Linux distributions.</p> <ul dir="auto"> <li>Typical Ubuntu release dates: April, October</li> <li>Typical Ubuntu feature freeze dates: February, August</li> <li>Typical Fedora release dates: May, October</li> <li>Typical Fedora feature freeze dates: March, September</li> </ul> <p dir="auto">Given those dates, the target dates for EL Python releases would be the final week of January and the final week of July each year.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Which CPython branches would EL Python track?</h1><a id="user-content-which-cpython-branches-would-el-python-track" class="anchor" aria-label="Permalink: Which CPython branches would EL Python track?" href="#which-cpython-branches-would-el-python-track"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">By default, there would be an EL Python maintenance branch for each CPython maintenance branch. These branches would all include a core set of patches that:</p> <ul dir="auto"> <li>added the EL Python version and variant information</li> <li>added any EL-Python-only features that had not yet been approved for inclusion in the CPython reference implementation (the ideal size of this patch set is for it to be empty, but it may be non-empty due to features that offer clear value to enterprise users, where python-dev is nevertheless collectively skeptical as to the value for broader audiences)</li> </ul> <p dir="auto">Each branch would also include a set of approved backports from later CPython maintenance and feature releases.</p> <p dir="auto">In addition, at the EL Python maintainers' discretion, some EL Python maintenance branches may be defined as LTS branches, which would live on beyond the mainstream EOL of the corresponding CPython branches.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Who would have merge permissions for EL Python branches?</h1><a id="user-content-who-would-have-merge-permissions-for-el-python-branches" class="anchor" aria-label="Permalink: Who would have merge permissions for EL Python branches?" href="#who-would-have-merge-permissions-for-el-python-branches"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">At least initially, EL Python merge permissions would be restricted to staff working for commercial redistributors and other organisations formally participating in the EL Python effort (where the exact nature of "formal participation" would be defined in collaboration with the Python Software Foundation).</p> <p dir="auto">This is due to the fact that the proposed differences in maintenance policies between EL Python and CPython are driven almost entirely by commercial and enterprise support requirements, which gives EL Python a strongly business-driven character that isn't the case for the more egalitarian, community-driven, CPython project.</p> <p dir="auto">It's expected that this restriction would eventually be dropped - it's just a simplfying community management assumption to start out with.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">How would EL Python versions be identified?</h1><a id="user-content-how-would-el-python-versions-be-identified" class="anchor" aria-label="Permalink: How would EL Python versions be identified?" href="#how-would-el-python-versions-be-identified"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It is proposed that EL Python versions be identified through a combination of semantic versioning and calendar versioning:</p> <ul dir="auto"> <li>SemVer (X.Y.Z) for the base CPython version (e.g. 3.6.2)</li> <li>CalVer plus a patch release serial number (YY.MM.N) for EL Python releases (e.g. 18.01.0)</li> </ul> <p dir="auto">This information will be reported as:</p> <ul dir="auto"> <li><code>sys.version_info</code> -> <code>sys.version_info(major=3, minor=6, micro=2, releaselevel='final', serial=0)</code></li> <li><code>sys.hex_version</code> -> <code>0x30602f0</code></li> <li><code>sys.implementation.version</code> -> <code>sys.version_info(major=18, minor=1, micro=0, releaselevel='final', serial=0)</code></li> <li><code>sys.implementation.hexversion</code> -> <code>0x120100f0</code></li> <li><code>sys.version</code> -> <code>3.6.2.18.01.0 (... other build details ...)</code></li> </ul> <p dir="auto">To maximise backwards compatibility (and to ensure that otherwise CPython specific test cases are run), <code>sys.implementation.name</code> will be reported as <code>"cpython"</code> in EL Python branches, and the default CPython <code>sys.implementation.cache_tag</code> will also be re-used.</p> <p dir="auto">Even if no other markers were added, this would be sufficient to allow CPython and EL Python builds to be fairly reliably distinguished based on:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="impl = sys.implementation if impl.name == 'cpython': if impl.version == sys.version_info: print("CPython") else: print("EL Python")"><pre class="notranslate"><code>impl = sys.implementation if impl.name == 'cpython': if impl.version == sys.version_info: print("CPython") else: print("EL Python") </code></pre></div> <p dir="auto">However, as a more robust marker that also allows for identification of other CPython variants, an additional implementation-specific field, <code>variant</code> would be added:</p> <ul dir="auto"> <li><code>sys.implementation.variant</code> -> <code>elpython</code></li> </ul> <p dir="auto">This would be proposed as a new standard <code>sys.implementation</code> field for Python 3.9+ (defaulting to <code>reference</code> for reference implementations, such as CPython itself for the <code>sys.implementation.name == 'cpython'</code> case).</p> <p dir="auto">Redistributors would be encouraged to always set it appropriately to help identify their particular builds (using the <code>elpython-</code> prefix for EL Python rebuilds).</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">What does "no mandatory file regeneration" mean?</h1><a id="user-content-what-does-no-mandatory-file-regeneration-mean" class="anchor" aria-label="Permalink: What does "no mandatory file regeneration" mean?" href="#what-does-no-mandatory-file-regeneration-mean"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Migrating to a new CPython feature release necessarily means doing the following:</p> <ul dir="auto"> <li>reinstalling all components installed into <code>site-packages</code> to account for the new directory name</li> <li>regenerating all pyc files to use the new compatibility tag and (typically) magic number</li> <li>rebuilding any extension modules that targeted the regular CPython C API, rather than the limited API that offers greater assurances of ABI stability across feature releases</li> <li>regenerating all version-specific wheel files using the new version compatibility tag</li> <li>refreshing all virtual environments to account for the change in the path of <code>site-packages</code>, any changes to the standard library layout, and for the changes to <code>pyc</code> file and extension module naming schemes</li> </ul> <p dir="auto">These updates are required even if the affected software is otherwise entirely compatible with both runtime versions at a source code level.</p> <p dir="auto">The "no mandatory rebuilds or file regeneration" requirement means that:</p> <ol dir="auto"> <li>Any EL Python branch will <em>always</em> support the filesystem layout of the corresponding CPython X.Y.Z release</li> <li>Any EL Python branch will <em>always</em> support loading <code>pyc</code> files and extension modules named with the compatibility tags for the corresponding CPython X.Y.Z release</li> <li>Any EL Python branch will <em>always</em> support installing wheel files using the compatibility tags for the corresponding CPython X.Y.Z release</li> </ol> <p dir="auto">Features and fixes will thus only be considered as potential backport candidates from CPython to EL Python if either:</p> <ul dir="auto"> <li>the original change didn't require an update to the filesystem layout or any of the file compatibility tags; or</li> <li>an alternate (potentially harder to maintain) implementation is available that doesn't require an update to the filesystem layout or any of the file compatibility tags; or</li> <li>the feature is deemed valuable enough to justify the complexity of enhancing EL Python itself to support new, EL Python specific, file compatibility tags, without losing support for the corresponding CPython X.Y.Z compatibility tags</li> </ul> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">How would EL Python be expected to affect the testing matrix for community Python projects?</h1><a id="user-content-how-would-el-python-be-expected-to-affect-the-testing-matrix-for-community-python-projects" class="anchor" aria-label="Permalink: How would EL Python be expected to affect the testing matrix for community Python projects?" href="#how-would-el-python-be-expected-to-affect-the-testing-matrix-for-community-python-projects"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Any software tested against a given CPython X.Y.Z release would be expected to work unmodified on the corresponding EL Python branch. Software tested against a later CPython X.Y.Z+ release would normally be expected to work against the corresponding EL Python release, as long as it was not impacted by any bugs that had been fixed in CPython, but the fix hadn't been backported due to backwards compatibility concerns that were deemed acceptable for CPython, but not for EL Python.</p> <p dir="auto">This means that for projects which already promptly drop support for older CPython versions when new feature releases become available, or when a given maintenance branch is no longer receiving security updates, EL Python should have no impact on the typical testing matrix (and this is considered a desirable outcome).</p> <p dir="auto">Where EL Python may potentially become an interesting testing target for Python community projects is in the following cases:</p> <ul dir="auto"> <li>when a given CPython maintenance branch is no longer receiving security updates, some projects may choose to start testing against the corresponding EL Python branch instead of completely dropping support for that version (assuming that an EL Python branch exists for that version with a longer lifecycle than the regular CPython one - as noted above, that will only be the case for selected branches)</li> <li>when a project wants or needs to adopt a feature from a later CPython release, and that feature has been backported to EL Python, some projects may choose to switch to only supporting the EL Python variant of that older release, and not the regular CPython release</li> </ul> <p dir="auto">The goal of this approach is that the existence of EL Python should never <em>increase</em> the testing burden for any community project - if EL Python is added to a testing matrix, it should typically be accompanied by the <em>removal</em> of the corresponding CPython branch (either because that branch is no longer receiving security updates, or because it lacks a feature the project is now relying on).</p> <p dir="auto">By contrast, both previous proposals for making new CPython features available to end users without waiting for the next CPython feature release had the side effect of potentially significantly expanding build & test matrices for community projects (see the deferred <a href="https://www.python.org/dev/peps/pep-0407/" rel="nofollow">PEP 407</a> and the withdrawn <a href="https://www.python.org/dev/peps/pep-0413/" rel="nofollow">PEP 413</a> for details)</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">What is the proposed relationship with CPython?</h1><a id="user-content-what-is-the-proposed-relationship-with-cpython" class="anchor" aria-label="Permalink: What is the proposed relationship with CPython?" href="#what-is-the-proposed-relationship-with-cpython"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><em>All</em> functional changes to EL Python should either appear in CPython first, or else be covered by a draft PEP or feature request that has been submitted for consideration for a future version of CPython, and <em>python-dev</em> has made the determination that it is suitable for inclusion as an EL Python feature, pending further consideration as a potential mainline CPython feature.</p> <p dir="auto">To ensure the absence of churn-related compatibility breaks in EL Python maintenance releases, EL Python may also end up including opt-in behaviour toggles that don't appear in regular CPython feature releases (see PEP 493 for some examples of this kind of toggle related to backporting the PEP 476 change to always verify HTTPS certificates by default).</p> <p dir="auto">To allow for transparent upgrades from a regular CPython build to EL Python, the directory paths used in EL Python would necessarily be fully compatible with those used by CPython (e.g. the <code>/usr/lib</code> and <code>/usr/lib</code> subdirectories would still be called <code>pythonX.Y</code>). However, EL Python may also add additional EL Python specific directories that a regular CPython build will ignore.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">How else would EL Python differ from CPython?</h1><a id="user-content-how-else-would-el-python-differ-from-cpython" class="anchor" aria-label="Permalink: How else would EL Python differ from CPython?" href="#how-else-would-el-python-differ-from-cpython"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">One big difference would be that EL Python would be a source-only project: it would <em>not</em> provide any prebuilt binary installers for any platform. Instead, the expectation would be that redistributors and end users would take the project and produce their own binaries in the formats of interest to them.</p> <p dir="auto">In addition, while EL Python would transparently consume pyc files, extension modules and wheel files built for CPython, and would default to emitting CPython compatible versions of such files, a mechanism would need to be provided for publishers to indicate when their artifacts were EL Python specific (e.g. when they're depending on a feature backported from a later CPython release).</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">What is the proposed relationship with the PSF?</h1><a id="user-content-what-is-the-proposed-relationship-with-the-psf" class="anchor" aria-label="Permalink: What is the proposed relationship with the PSF?" href="#what-is-the-proposed-relationship-with-the-psf"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">We'd like EL Python to be a PSF backed project, just like CPython, and contributors to EL Python would be required to sign the CPython CLA before their contributions can be accepted.</p> <p dir="auto">We'd also expect any formal participation agreements to be worked out in collaboration with the PSF, rather than directly between participating organisations.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">What Code of Conduct would the project use?</h1><a id="user-content-what-code-of-conduct-would-the-project-use" class="anchor" aria-label="Permalink: What Code of Conduct would the project use?" href="#what-code-of-conduct-would-the-project-use"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">EL Python would operate under the Contributor Covenant: <a href="https://www.contributor-covenant.org/" rel="nofollow">https://www.contributor-covenant.org/</a></p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">How would the CoC be enforced?</h1><a id="user-content-how-would-the-coc-be-enforced" class="anchor" aria-label="Permalink: How would the CoC be enforced?" href="#how-would-the-coc-be-enforced"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Initially, by the folks with merge privileges, with their respective employers and the PSF Board available as potential paths of escalation for any CoC concerns relating to the project maintainers themselves. EL Python would also respect any existing org-wide bans from PSF provided communication channels.</p> <p dir="auto">Eventually, as the PSF defines clearer processes for reporting of CoC concerns for the projects it oversees, EL Python would explicitly opt in to being covered by that process.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">What are the alternatives to pursuing the EL Python idea?</h1><a id="user-content-what-are-the-alternatives-to-pursuing-the-el-python-idea" class="anchor" aria-label="Permalink: What are the alternatives to pursuing the EL Python idea?" href="#what-are-the-alternatives-to-pursuing-the-el-python-idea"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Historically, redistributors (most notably Red Hat, as part of Red Hat Enterprise Linux) have offered long term commercial support for CPython simply by choosing a particular CPython X.Y.Z release, and then offering that specific version for an extended period of time, focusing mainly on security fixes, backports of requested bug fixes, and occasionally backports of smaller features (e.g. backporting <code>collections.OrderedDict</code> from Python 2.7 to Python 2.6 in RHEL & CentOS 6).</p> <p dir="auto">An example of this approach can be seen by looking at the patch set for Python 2.7 in CentOS 7, which relies on selective backports atop 2.7.5 rather than rebasing outright to upstream maintenance releases: <a href="https://git.centos.org/rpms/python/blob/c7/f/SOURCES" rel="nofollow">https://git.centos.org/rpms/python/blob/c7/f/SOURCES</a></p> <p dir="auto">Unfortunately, while this approach does address the key concern of providing a stable, long-lived foundation for enterprise developers to build on, many other aspects of the related developer experience are considered highly undesirable:</p> <ul dir="auto"> <li>enterprise developers targeting these long term support releases miss out on even fully backwards compatible enhancements added in later CPython feature releases, reducing the incentive for their employers to contribute to CPython maintenance & feature development (whether directly or indirectly via a commercial redistributor)</li> <li>enhancements to the language, reference implementation and standard library often take years to see truly broad adoption, as libraries and frameworks maintaining compatibility with these older CPython releases are also often unable to adopt them, even if the project maintainers themselves are regularly upgrading to newer CPython releases. (See <a href="https://alexgaynor.net/2015/mar/30/red-hat-open-source-community/" rel="nofollow">this 2015 post</a> from Alex Gaynor, and <a href="http://www.curiousefficiency.org/posts/2015/04/stop-supporting-python26.html" rel="nofollow">this reply</a> from Nick Coghlan for further discussion of that problem)</li> <li>the developers <em>maintaining</em> these long term support branches are currently working in organisation specific silos, making it difficult to ensure cross-platform consistency in the resulting Python developer experience</li> <li>even when selected features <em>are</em> backported to these existing LTS releases, this isn't communicated in a clear and consistent way, so Python developers may not be aware they can rely on those features being present on the platforms they care about</li> </ul> <p dir="auto">The EL Python concept arose from asking the question of how we might effectively address the established commercial demand for a long term support variant of CPython in a way that:</p> <ul dir="auto"> <li>doesn't result in an inherently poor developer experience when targeting long-term support versions (especially later in their lifecycle)</li> <li>makes long term support versions (almost) as easy to develop and test against as regular CPython releases</li> <li>reduces the risk of fragmenting the Python developer experience across different competing long term support vendors</li> <li>makes it clear that offering long term support is considered the domain of professional software developers that are getting paid to meet that obligation, rather than something that can reasonably be expected of community volunteers</li> </ul> <p dir="auto">It is based in large part on the three tiered concept of "development", "stable", and "long term" kernels in the Linux kernel development process:</p> <ul dir="auto"> <li>development kernels -> CPython development branch</li> <li>stable kernels -> CPython maintenance branches, short term EL Python maintenance branches</li> <li>long term kernels -> long term EL Python maintenance branches</li> </ul> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">What about Python 2?</h1><a id="user-content-what-about-python-2" class="anchor" aria-label="Permalink: What about Python 2?" href="#what-about-python-2"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">While EL Python itself is being proposed as a Python 3 only project, the <code>tauthon</code> project is already pursuing a similar concept for Python 2.7: <a href="https://github.com/naftaliharris/tauthon">https://github.com/naftaliharris/tauthon</a></p> <p dir="auto"><em>If</em> EL Python were to ever gain a Python 2.7 branch, it would only be in the form of a post-2020 security-fix branch (including network security stack upgrades), rather than the kind of feature backport branch being proposed for 3.x releases.</p> </article></div><button hidden=""></button></section></div></div></div>   </div></div></div><div class="Box-sc-g0xbh4-0"></div></div></div></div></div><div id="find-result-marks-container" class="Box-sc-g0xbh4-0 cCoXib"></div><button hidden="" data-testid="" data-hotkey-scope="read-only-cursor-text-area"></button><button hidden=""></button></div>   <script type="application/json" 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