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data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="feedback-dialog-title"> Provide feedback </h1> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="feedback-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 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<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" data-view-component="true" class="Overlay Overlay-whenNarrow 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KB","deleteTooltip":"You must be signed in to make or propose changes","editTooltip":"You must be signed in to make or propose changes","ghDesktopPath":"https://desktop.github.com","isGitLfs":false,"onBranch":true,"shortPath":"2bb3924","siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Fpython%2Fpeps%2Fblob%2Fmain%2Fpeps%2Fpep-0753.rst","isCSV":false,"isRichtext":true,"toc":[{"level":2,"text":"Abstract","anchor":"abstract","htmlText":"Abstract"},{"level":2,"text":"Rationale and Motivation","anchor":"rationale-and-motivation","htmlText":"Rationale and Motivation"},{"level":2,"text":"Specification","anchor":"specification","htmlText":"Specification"},{"level":3,"text":"Metadata producers","anchor":"metadata-producers","htmlText":"Metadata producers"},{"level":3,"text":"Package indices","anchor":"package-indices","htmlText":"Package indices"},{"level":2,"text":"Conventions for Project-URL labels","anchor":"conventions-for-project-url-labels","htmlText":"Conventions for Project-URL labels"},{"level":3,"text":"Label normalization","anchor":"label-normalization","htmlText":"Label normalization"},{"level":3,"text":"Well-known labels","anchor":"well-known-labels","htmlText":"Well-known labels"},{"level":2,"text":"Backwards Compatibility","anchor":"backwards-compatibility","htmlText":"Backwards Compatibility"},{"level":3,"text":"Limited Impact","anchor":"limited-impact","htmlText":"Limited Impact"},{"level":2,"text":"Future Considerations","anchor":"future-considerations","htmlText":"Future Considerations"},{"level":2,"text":"Security Implications","anchor":"security-implications","htmlText":"Security Implications"},{"level":2,"text":"How To Teach This","anchor":"how-to-teach-this","htmlText":"How To Teach This"},{"level":2,"text":"Appendix A: Label normalization examples","anchor":"appendix-a-label-normalization-examples","htmlText":"Appendix A: Label normalization examples"},{"level":2,"text":"Copyright","anchor":"copyright","htmlText":"Copyright"}],"lineInfo":{"truncatedLoc":"409","truncatedSloc":"307"},"mode":"file"},"image":false,"isCodeownersFile":null,"isPlain":false,"isValidLegacyIssueTemplate":false,"issueTemplate":null,"discussionTemplate":null,"language":"reStructuredText","languageID":419,"large":false,"planSupportInfo":{"repoIsFork":null,"repoOwnedByCurrentUser":null,"requestFullPath":"/python/peps/blob/main/peps/pep-0753.rst","showFreeOrgGatedFeatureMessage":null,"showPlanSupportBanner":null,"upgradeDataAttributes":null,"upgradePath":null},"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_dockerfile","releasePath":"/python/peps/releases/new?marketplace=true","showPublishActionBanner":false},"rawBlobUrl":"https://github.com/python/peps/raw/refs/heads/main/peps/pep-0753.rst","renderImageOrRaw":false,"richText":"\u003carticle class=\"markdown-body entry-content container-lg\" itemprop=\"text\"\u003e\u003cp dir=\"auto\"\u003ePEP: 753\nTitle: Uniform project URLs in core metadata\nAuthor: William Woodruff \u0026lt;\u003ca href=\"mailto:william@yossarian.net\"\u003ewilliam@yossarian.net\u003c/a\u003e\u0026gt;,\u003c/p\u003e\n\u003cblockquote\u003e\nFacundo Tuesca \u0026lt;\u003ca href=\"mailto:facundo.tuesca@trailofbits.com\"\u003efacundo.tuesca@trailofbits.com\u003c/a\u003e\u0026gt;\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eSponsor: Barry Warsaw \u0026lt;barry at python.org\u0026gt;\nPEP-Delegate: Paul Moore \u0026lt;p.f.moore at gmail.com\u0026gt;\nDiscussions-To: \u003ca href=\"https://discuss.python.org/t/pep-753-uniform-urls-in-core-metadata/62792\" rel=\"nofollow\"\u003ehttps://discuss.python.org/t/pep-753-uniform-urls-in-core-metadata/62792\u003c/a\u003e\nStatus: Accepted\nType: Standards Track\nTopic: Packaging\nCreated: 29-Aug-2024\nPost-History: \u003ca href=\"https://discuss.python.org/t/core-metadata-should-home-page-and-download-url-be-deprecated/62037\" rel=\"nofollow\"\u003e26-Aug-2024\u003c/a\u003e,\u003c/p\u003e\n\u003cblockquote\u003e\n\u003ca href=\"https://discuss.python.org/t/pep-753-uniform-urls-in-core-metadata/62792\" rel=\"nofollow\"\u003e03-Sep-2024\u003c/a\u003e\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eResolution: \u003ca href=\"https://discuss.python.org/t/62792/30\" rel=\"nofollow\"\u003e10-Oct-2024\u003c/a\u003e\u003c/p\u003e\n\u003cpre\u003e.. canonical-pypa-spec:: :ref:`packaging:well-known-project-urls`\n\n\u003c/pre\u003e\n\u003ca name=\"user-content-abstract\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAbstract\u003c/h2\u003e\u003ca id=\"user-content-abstract\" class=\"anchor\" aria-label=\"Permalink: Abstract\" href=\"#abstract\"\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\"\u003eThis PEP recommends two discrete changes to the processing of core metadata by\nindices (such as PyPI) and other core metadata consumers:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eDeprecation of the \u003ccode\u003eHome-page\u003c/code\u003e and \u003ccode\u003eDownload-URL\u003c/code\u003e fields in favor of\ntheir \u003ccode\u003eProject-URL\u003c/code\u003e equivalents;\u003c/li\u003e\n\u003cli\u003eA set of \u003ca href=\"#id1\"\u003e\u003cspan id=\"user-content-id2\"\u003e:ref:`conventions \u0026lt;conventions-for-labels\u0026gt;`\u003c/span\u003e\u003c/a\u003e for normalizing and\nassigning semantics to \u003ccode\u003eProject-URL\u003c/code\u003e labels during consumer-side metadata\nprocessing.\u003c/li\u003e\n\u003c/ul\u003e\n\u003ca name=\"user-content-rationale-and-motivation\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRationale and Motivation\u003c/h2\u003e\u003ca id=\"user-content-rationale-and-motivation\" class=\"anchor\" aria-label=\"Permalink: Rationale and Motivation\" href=\"#rationale-and-motivation\"\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\"\u003ePython's standard \u003ca href=\"#id3\"\u003e\u003cspan id=\"user-content-id4\"\u003e:ref:`core metadata \u0026lt;packaging:core-metadata\u0026gt;`\u003c/span\u003e\u003c/a\u003e has gone\nthrough many years of revisions, with various standardized milestone versions.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThese revisions of the core metadata have introduced various mechanisms\nfor expressing a package's relationship to external resources, via URLs:\u003c/p\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003e\u003cp dir=\"auto\"\u003eMetadata 1.0 introduced \u003ccode\u003eHome-page\u003c/code\u003e, a single-use field containing\na URL to the distribution's home page.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-eml-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Home-page: https://example.com/sampleproject\"\u003e\u003cpre\u003e\u003cspan class=\"pl-v\"\u003eHome-page\u003c/span\u003e: https://example.com/sampleproject\u003c/pre\u003e\u003c/div\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003cp dir=\"auto\"\u003eMetadata 1.1 introduced \u003ccode\u003eDownload-URL\u003c/code\u003e, a complementary single-use field\ncontaining a URL suitable for downloading the current distribution.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-eml-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Download-URL: https://example.com/sampleproject/sampleproject-1.2.3.tar.gz\"\u003e\u003cpre\u003e\u003cspan class=\"pl-v\"\u003eDownload-URL\u003c/span\u003e: https://example.com/sampleproject/sampleproject-1.2.3.tar.gz\u003c/pre\u003e\u003c/div\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003cp dir=\"auto\"\u003eMetadata 1.2 introduced \u003ccode\u003eProject-URL\u003c/code\u003e, a \u003cstrong\u003emultiple-use\u003c/strong\u003e field containing\na label-and-URL pair. Each label is free text conveying the URL's semantics.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-eml-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Project-URL: Homepage, https://example.com/sampleproject\nProject-URL: Download, https://example.com/sampleproject/sampleproject-1.2.3.tar.gz\nProject-URL: Documentation, https://example.com/sampleproject/docs\"\u003e\u003cpre\u003e\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: Homepage, https://example.com/sampleproject\n\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: Download, https://example.com/sampleproject/sampleproject-1.2.3.tar.gz\n\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: Documentation, https://example.com/sampleproject/docs\u003c/pre\u003e\u003c/div\u003e\n\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp dir=\"auto\"\u003eMetadata 2.1, 2.2, and 2.3 leave the behavior of these fields as originally\nspecified.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBecause \u003ccode\u003eProject-URL\u003c/code\u003e allows free text labels and is multiple-use, informal\nconventions have arisen for representing the values of\n\u003ccode\u003eHome-page\u003c/code\u003e and \u003ccode\u003eDownload-URL\u003c/code\u003e within \u003ccode\u003eProject-URL\u003c/code\u003e instead.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThese conventions have seen significant adoption, with \u003ca href=\"http://www.python.org/dev/peps/pep-0621\" rel=\"nofollow\"\u003ePEP 621\u003c/a\u003e explicitly\nchoosing to provide only a \u003ccode\u003eproject.urls\u003c/code\u003e table rather than a\n\u003ccode\u003eproject.home-page\u003c/code\u003e field. From \u003ca href=\"http://www.python.org/dev/peps/pep-0621\" rel=\"nofollow\"\u003ePEP 621\u003c/a\u003e's rejected ideas:\u003c/p\u003e\n\u003cblockquote\u003e\nWhile the core metadata supports it, having a single field for a project's\nURL while also supporting a full table seemed redundant and confusing.\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThis PEP exists to formalize the informal conventions that have arisen, as well\nas explicitly document \u003ccode\u003eHome-page\u003c/code\u003e and \u003ccode\u003eDownload-URL\u003c/code\u003e as deprecated in\nfavor of equivalent \u003ccode\u003eProject-URL\u003c/code\u003e representations.\u003c/p\u003e\n\u003ca name=\"user-content-specification\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSpecification\u003c/h2\u003e\u003ca id=\"user-content-specification\" class=\"anchor\" aria-label=\"Permalink: Specification\" href=\"#specification\"\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\"\u003eThis PEP proposes that \u003ccode\u003eHome-page\u003c/code\u003e and \u003ccode\u003eDownload-URL\u003c/code\u003e be considered\n\u003cstrong\u003edeprecated\u003c/strong\u003e. This deprecation has implications for both package metadata\nproducers (e.g. build backends and packaging tools) and package indices\n(e.g. PyPI).\u003c/p\u003e\n\u003ca name=\"user-content-id5\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMetadata producers\u003c/h3\u003e\u003ca id=\"user-content-metadata-producers\" class=\"anchor\" aria-label=\"Permalink: Metadata producers\" href=\"#metadata-producers\"\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\"\u003eThis PEP stipulates the following for metadata producers:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eWhen generating metadata 1.2 or later, producers \u003cstrong\u003eSHOULD\u003c/strong\u003e emit only\n\u003ccode\u003eProject-URL\u003c/code\u003e, and \u003cstrong\u003eSHOULD NOT\u003c/strong\u003e emit \u003ccode\u003eHome-page\u003c/code\u003e or \u003ccode\u003eDownload-URL\u003c/code\u003e\nfields.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThese stipulations do not change the optionality of URL fields in core metadata.\nIn other words, producers \u003cstrong\u003eMAY\u003c/strong\u003e choose to omit \u003ccode\u003eProject-URL\u003c/code\u003e entirely\nat their discretion.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis PEP does \u003cstrong\u003enot\u003c/strong\u003e propose the outright removal of support for \u003ccode\u003eHome-page\u003c/code\u003e\nor \u003ccode\u003eDownload-URL\u003c/code\u003e. However, see \u003ca href=\"#id6\"\u003e\u003cspan id=\"user-content-id7\"\u003e:ref:`future-considerations`\u003c/span\u003e\u003c/a\u003e for\nthoughts on how a new (as of yet unspecified) major core metadata version\ncould complete the deprecation cycle via removal of these deprecated fields.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSimilarly, this PEP does \u003cstrong\u003enot\u003c/strong\u003e propose that metadata producers emit\n\u003ca href=\"#id8\"\u003e\u003cspan id=\"user-content-id9\"\u003e:ref:`normalized labels \u0026lt;label-normalization\u0026gt;`\u003c/span\u003e\u003c/a\u003e. Label normalization is performed\nsolely on the processing and consumption side (i.e. within indices and other\nconsumers of distribution metadata).\u003c/p\u003e\n\u003ca name=\"user-content-id10\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePackage indices\u003c/h3\u003e\u003ca id=\"user-content-package-indices\" class=\"anchor\" aria-label=\"Permalink: Package indices\" href=\"#package-indices\"\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\"\u003eThis PEP stipulates the following for package indices:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eWhen interpreting a distribution's metadata of version 1.2 or later\n(e.g. for rendering on a web page), the index \u003cstrong\u003eMUST\u003c/strong\u003e prefer\n\u003ccode\u003eProject-URL\u003c/code\u003e fields as a source of URLs over \u003ccode\u003eHome-page\u003c/code\u003e and\n\u003ccode\u003eDownload-URL\u003c/code\u003e, even if the latter are explicitly provided.\u003c/li\u003e\n\u003cli\u003eIf a distribution's metadata contains only the \u003ccode\u003eHome-page\u003c/code\u003e and\n\u003ccode\u003eDownload-URL\u003c/code\u003e fields, the index \u003cstrong\u003eMAY\u003c/strong\u003e choose to ignore those fields\nand behave as though no URLs were provided in the metadata. In this case,\nthe index \u003cstrong\u003eSHOULD\u003c/strong\u003e present an appropriate warning or notification to\nthe uploading party.\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThe mechanism for presenting this warning or notification is not\nspecified, since it will vary by index. By way of example, an index may\nchoose to present a warning in the HTTP response to an upload request, or\nsend an email or other notification to the maintainer(s) of the project.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eIf a distribution's metadata contains both sets of fields, the index \u003cstrong\u003eMAY\u003c/strong\u003e\nchoose to reject the distribution outright. However, this is\n\u003cstrong\u003eNOT RECOMMENDED\u003c/strong\u003e until a future unspecified major metadata version\nformally removes support for \u003ccode\u003eHome-page\u003c/code\u003e and \u003ccode\u003eDownload-URL\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eAny changes to the interpretation of metadata of version 1.2 or later that\nresult in previously recognized URLs no longer being recognized\n\u003cstrong\u003eSHOULD NOT\u003c/strong\u003e be retroactively applied to previously uploaded packages.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThese stipulations do not change the optionality of URL processing by indices.\nIn other words, an index that does not process URLs within uploaded\ndistributions may continue to ignore all URL fields entirely.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSimilarly, these stipulations do \u003cstrong\u003enot\u003c/strong\u003e imply that the index should\npersist any normalizations that it performs to a distribution's metadata.\nIn other words, this PEP stipulates label normalization for the purpose\nof user presentation, not for the purpose of modifying an uploaded distribution\nor its \"sidecar\" \u003ca href=\"http://www.python.org/dev/peps/pep-0658\" rel=\"nofollow\"\u003ePEP 658\u003c/a\u003e metadata file.\u003c/p\u003e\n\u003ca name=\"user-content-conventions-for-project-url-labels\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eConventions for \u003ccode\u003eProject-URL\u003c/code\u003e labels\u003c/h2\u003e\u003ca id=\"user-content-conventions-for-project-url-labels\" class=\"anchor\" aria-label=\"Permalink: Conventions for Project-URL labels\" href=\"#conventions-for-project-url-labels\"\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\"\u003eThe deprecations proposed above require a formalization of the currently\ninformal relationship between \u003ccode\u003eHome-page\u003c/code\u003e, \u003ccode\u003eDownload-URL\u003c/code\u003e, and their\n\u003ccode\u003eProject-URL\u003c/code\u003e equivalents.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis formalization has two parts:\u003c/p\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003eA set of rules for normalizing \u003ccode\u003eProject-URL\u003c/code\u003e labels during index-side\nprocessing;\u003c/li\u003e\n\u003cli\u003eA set of \"well-known\" normalized label values that indices may specialize\nURL presentation for.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ca name=\"user-content-id11\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLabel normalization\u003c/h3\u003e\u003ca id=\"user-content-label-normalization\" class=\"anchor\" aria-label=\"Permalink: Label normalization\" href=\"#label-normalization\"\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\"\u003eThe core metadata specification stipulates that \u003ccode\u003eProject-URL\u003c/code\u003e labels are\nfree text, limited to 32 characters.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis PEP proposes adding the concept of a \"normalized\" label to the core\nmetadata specification. Label normalization is defined via the following\nPython function:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-python notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import string\ndef normalize_label(label: str) -\u0026gt; str:\n chars_to_remove = string.punctuation + string.whitespace\n removal_map = str.maketrans(\u0026quot;\u0026quot;, \u0026quot;\u0026quot;, chars_to_remove)\n return label.translate(removal_map).lower()\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003estring\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003edef\u003c/span\u003e \u003cspan class=\"pl-en\"\u003enormalize_label\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003elabel\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003estr\u003c/span\u003e) \u003cspan class=\"pl-c1\"\u003e-\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003estr\u003c/span\u003e:\n \u003cspan class=\"pl-s1\"\u003echars_to_remove\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003estring\u003c/span\u003e.\u003cspan class=\"pl-s1\"\u003epunctuation\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e+\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003estring\u003c/span\u003e.\u003cspan class=\"pl-s1\"\u003ewhitespace\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eremoval_map\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003estr\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003emaketrans\u003c/span\u003e(\u003cspan class=\"pl-s\"\u003e\"\"\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003echars_to_remove\u003c/span\u003e)\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003elabel\u003c/span\u003e.\u003cspan class=\"pl-en\"\u003etranslate\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eremoval_map\u003c/span\u003e).\u003cspan class=\"pl-en\"\u003elower\u003c/span\u003e()\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn plain language: a label is \u003cem\u003enormalized\u003c/em\u003e by deleting all ASCII punctuation and\nwhitespace, and then converting the result to lowercase.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe following table shows examples of labels before (raw) and after\nnormalization:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\n\n\n\n\u003cthead valign=\"bottom\"\u003e\n\u003ctr\u003e\u003cth\u003eRaw\u003c/th\u003e\n\u003cth\u003eNormalized\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody valign=\"top\"\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003eHomepage\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003ehomepage\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003eHome-page\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003ehomepage\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003eHome page\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003ehomepage\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003eChange_Log\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003echangelog\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003eWhat's New?\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003ewhatsnew\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eWhen processing distribution metadata, package indices \u003cstrong\u003eSHOULD\u003c/strong\u003e perform\nlabel normalization to determine if a given label is\n\u003ca href=\"#id12\"\u003e\u003cspan id=\"user-content-id13\"\u003e:ref:`well known \u0026lt;well-known\u0026gt;`\u003c/span\u003e\u003c/a\u003e for subsequent special processing.\nLabels that are not well-known \u003cstrong\u003eMUST\u003c/strong\u003e be processed in their un-normalized\nform.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNormalization does \u003cstrong\u003enot\u003c/strong\u003e change pre-existing semantics around duplicated\n\u003ccode\u003eProject-URL\u003c/code\u003e labels. In other words, normalization may result in duplicate\nlabels in the project's metadata, but only in the same manner that was already permitted\n(since the \u003ca href=\"#id14\"\u003e\u003cspan id=\"user-content-id15\"\u003e:ref:`core metadata specification \u0026lt;packaging:core-metadata\u0026gt;`\u003c/span\u003e\u003c/a\u003e does\nnot stipulate that labels are unique).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eExcerpted examples of normalized metadata fields are provided in\n\u003ca href=\"#id16\"\u003e\u003cspan id=\"user-content-id17\"\u003e:ref:`Appendix A \u0026lt;appendix-a\u0026gt;`\u003c/span\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003ca name=\"user-content-well-known-labels\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWell-known labels\u003c/h3\u003e\u003ca id=\"user-content-well-known-labels\" class=\"anchor\" aria-label=\"Permalink: Well-known labels\" href=\"#well-known-labels\"\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\"\u003eIn addition to the normalization rules above, this PEP proposes a\nfixed (but extensible) set of \"well-known\" \u003ccode\u003eProject-URL\u003c/code\u003e labels,\nas well as aliases and human-readable equivalents.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe following table lists these labels, in normalized form:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\n\n\n\n\n\u003cthead valign=\"bottom\"\u003e\n\u003ctr\u003e\u003cth\u003eLabel (Human-readable equivalent)\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003cth\u003eAliases\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody valign=\"top\"\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003ehomepage\u003c/code\u003e (Homepage)\u003c/td\u003e\n\u003ctd\u003eThe project's home page\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003e(none)\u003c/em\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003esource\u003c/code\u003e (Source Code)\u003c/td\u003e\n\u003ctd\u003eThe project's hosted source code or repository\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003erepository\u003c/code\u003e, \u003ccode\u003esourcecode\u003c/code\u003e, \u003ccode\u003egithub\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003edownload\u003c/code\u003e (Download)\u003c/td\u003e\n\u003ctd\u003eA download URL for the current distribution, equivalent to \u003ccode\u003eDownload-URL\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003e(none)\u003c/em\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003echangelog\u003c/code\u003e (Changelog)\u003c/td\u003e\n\u003ctd\u003eThe project's comprehensive changelog\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003echanges\u003c/code\u003e, \u003ccode\u003ewhatsnew\u003c/code\u003e, \u003ccode\u003ehistory\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003ereleasenotes\u003c/code\u003e (Release Notes)\u003c/td\u003e\n\u003ctd\u003eThe project's curated release notes\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003e(none)\u003c/em\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003edocumentation\u003c/code\u003e (Documentation)\u003c/td\u003e\n\u003ctd\u003eThe project's online documentation\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003edocs\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003eissues\u003c/code\u003e (Issue Tracker)\u003c/td\u003e\n\u003ctd\u003eThe project's bug tracker\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003ebugs\u003c/code\u003e, \u003ccode\u003eissue\u003c/code\u003e, \u003ccode\u003etracker\u003c/code\u003e, \u003ccode\u003eissuetracker\u003c/code\u003e, \u003ccode\u003ebugtracker\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003ccode\u003efunding\u003c/code\u003e (Funding)\u003c/td\u003e\n\u003ctd\u003eFunding Information\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003esponsor\u003c/code\u003e, \u003ccode\u003edonate\u003c/code\u003e, \u003ccode\u003edonation\u003c/code\u003e\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eIndices \u003cstrong\u003eMAY\u003c/strong\u003e choose to use the human-readable equivalents suggested above\nin their UI elements, if appropriate. Alternatively, indices \u003cstrong\u003eMAY\u003c/strong\u003e choose\ntheir own appropriate human-readable equivalents for UI elements.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePackagers and metadata producers \u003cstrong\u003eMAY\u003c/strong\u003e choose to use any label that normalizes\nto these labels (or their aliases) to communicate specific URL intents to\npackage indices and downstreams.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSimilarly, indices \u003cstrong\u003eMAY\u003c/strong\u003e choose to specialize their rendering or presentation\nof URLs with these labels, e.g. by presenting an appropriate icon or tooltip\nfor each label.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIndices \u003cstrong\u003eMAY\u003c/strong\u003e also specialize the rendering or presentation of additional\nlabels or URLs, including (but not limited to), labels that start with a\nwell-known label, and URLs that refer to a known service provider domain (e.g.\nfor documentation hosting or issue tracking).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis PEP recognizes that the list of well-known labels is unlikely to remain\nstatic, and that subsequent additions to it should not require the overhead\nassociated with a formal PEP process or new metadata version. As such,\nthis PEP proposes that the list above become a \"living\" list within\nthe \u003ca href=\"#id18\"\u003e\u003cspan id=\"user-content-id19\"\u003e:ref:`PyPA specifications \u0026lt;packaging:packaging-specifications\u0026gt;`\u003c/span\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003ca name=\"user-content-backwards-compatibility\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBackwards Compatibility\u003c/h2\u003e\u003ca id=\"user-content-backwards-compatibility\" class=\"anchor\" aria-label=\"Permalink: Backwards Compatibility\" href=\"#backwards-compatibility\"\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\u003ca name=\"user-content-limited-impact\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLimited Impact\u003c/h3\u003e\u003ca id=\"user-content-limited-impact\" class=\"anchor\" aria-label=\"Permalink: Limited Impact\" href=\"#limited-impact\"\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\"\u003eThis PEP is expected to have little to no impact on existing packaging tooling\nor package indices:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ePackaging tooling: no changes to the correctness or well-formedness\nof the core metadata. This PEP proposes deprecations as well as behavioral\nrefinements, but all currently (and historically) produced metadata will\ncontinue to be valid per the rules of its respective version.\u003c/li\u003e\n\u003cli\u003ePackage indices: indices will continue to expect well-formed core metadata,\nwith no behavioral changes. Indices \u003cstrong\u003eMAY\u003c/strong\u003e choose to emit warnings or\nnotifications on the presence of now-deprecated fields,\n\u003ca href=\"#id20\"\u003e\u003cspan id=\"user-content-id21\"\u003e:ref:`per above \u0026lt;package-indices\u0026gt;`\u003c/span\u003e\u003c/a\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003ca name=\"user-content-id22\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFuture Considerations\u003c/h2\u003e\u003ca id=\"user-content-future-considerations\" class=\"anchor\" aria-label=\"Permalink: Future Considerations\" href=\"#future-considerations\"\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\"\u003eThis PEP does not stipulate or require any future metadata changes.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHowever, per \u003ca href=\"#id23\"\u003e\u003cspan id=\"user-content-id24\"\u003e:ref:`metadata-producers`\u003c/span\u003e\u003c/a\u003e and \u003ca href=\"#id25\"\u003e\u003cspan id=\"user-content-id26\"\u003e:ref:`conventions-for-labels`\u003c/span\u003e\u003c/a\u003e,\nwe identify the following potential future goals for a new major release of\nthe core metadata standards:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eOutright removal of support for \u003ccode\u003eHome-page\u003c/code\u003e and \u003ccode\u003eDownload-URL\u003c/code\u003e in the\nnext major core metadata version. If removed, package indices and consumers\n\u003cstrong\u003eMUST\u003c/strong\u003e reject metadata containing these fields when said metadata is of\nthe new major version.\u003c/li\u003e\n\u003cli\u003eEnforcement of label normalization. If enforced, package producers\n\u003cstrong\u003eMUST\u003c/strong\u003e emit only normalized \u003ccode\u003eProject-URL\u003c/code\u003e labels when generating\ndistribution metadata, and package indices and consumers \u003cstrong\u003eMUST\u003c/strong\u003e reject\ndistributions containing non-normalized labels. Note: requiring\nnormalization merely restricts labels to lowercase text, and excludes\nwhitespace and punctuation. It does NOT restrict project URLs solely to\nthe use of \"well-known\" labels.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThese potential changes would be backwards incompatible, hence their\ninclusion only in this section. Acceptance of this PEP does NOT commit\nany future metadata revision to actually making these changes.\u003c/p\u003e\n\u003ca name=\"user-content-security-implications\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSecurity Implications\u003c/h2\u003e\u003ca id=\"user-content-security-implications\" class=\"anchor\" aria-label=\"Permalink: Security Implications\" href=\"#security-implications\"\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\"\u003eThis PEP does not identify any positive or negative security implications\nassociated with deprecating \u003ccode\u003eHome-page\u003c/code\u003e and \u003ccode\u003eDownload-URL\u003c/code\u003e or with\nlabel normalization.\u003c/p\u003e\n\u003ca name=\"user-content-how-to-teach-this\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHow To Teach This\u003c/h2\u003e\u003ca id=\"user-content-how-to-teach-this\" class=\"anchor\" aria-label=\"Permalink: How To Teach This\" href=\"#how-to-teach-this\"\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\"\u003eThe changes in this PEP should be transparent to the majority of the packaging\necosystem's userbase; the primary beneficiaries of this PEP's changes are\npackaging tooling authors and index maintainers, who will be able to reduce the\nnumber of unique URL fields produced and checked.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA small number of package maintainers may observe new warnings or notifications\nfrom their index of choice, should the index choose to ignore \u003ccode\u003eHome-page\u003c/code\u003e\nand \u003ccode\u003eDownload-URL\u003c/code\u003e as suggested. Similarly, a small number of package\nmaintainers may observe that their index of choice no longer renders\ntheir URLs, if only present in the deprecated fields. However, no package\nmaintainers should observe rejected package uploads or other breaking\nchanges to packaging workflows due to this PEP's proposed changes.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAnybody who observes warnings or changes to the presentation of\nURLs on indices can be taught about this PEP's behavior via official\npackaging resources, such as the\n\u003ca href=\"#id27\"\u003e\u003cspan id=\"user-content-id28\"\u003e:ref:`Python Packaging User Guide \u0026lt;packaging\u0026gt;`\u003c/span\u003e\u003c/a\u003e\nand \u003ca href=\"https://docs.pypi.org/\" rel=\"nofollow\"\u003ePyPI's user documentation\u003c/a\u003e, the latter of which\nalready contains an informal description of PyPI's URL handling behavior.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf this PEP is accepted, the authors of this PEP will coordinate to update\nand cross-link the resources mentioned above.\u003c/p\u003e\n\u003ca name=\"user-content-appendix-a-label-normalization-examples\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAppendix A: Label normalization examples\u003c/h2\u003e\u003ca id=\"user-content-appendix-a-label-normalization-examples\" class=\"anchor\" aria-label=\"Permalink: Appendix A: Label normalization examples\" href=\"#appendix-a-label-normalization-examples\"\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\"\u003eThis appendix provides an illustrative excerpt of a distribution's\nmetadata, before and after index-side processing:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBefore:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-eml-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Project-URL: Home-page, https://example.com\nProject-URL: Homepage, https://another.example.com\nProject-URL: Source, https://github.com/example/example\nProject-URL: GitHub, https://github.com/example/example\nProject-URL: Another Service, https://custom.example.com\"\u003e\u003cpre\u003e\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: Home-page, https://example.com\n\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: Homepage, https://another.example.com\n\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: Source, https://github.com/example/example\n\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: GitHub, https://github.com/example/example\n\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: Another Service, https://custom.example.com\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAfter:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-eml-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Project-URL: homepage, https://example.com\nProject-URL: homepage, https://another.example.com\nProject-URL: source, https://github.com/example/example\nProject-URL: github, https://github.com/example/example\nProject-URL: Another Service, https://custom.example.com\"\u003e\u003cpre\u003e\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: homepage, https://example.com\n\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: homepage, https://another.example.com\n\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: source, https://github.com/example/example\n\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: github, https://github.com/example/example\n\u003cspan class=\"pl-v\"\u003eProject-URL\u003c/span\u003e: Another Service, https://custom.example.com\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn particular, observe:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eNormalized duplicates are preserved (both \u003ccode\u003eHome-page\u003c/code\u003e and \u003ccode\u003eHomepage\u003c/code\u003e\nbecome \u003ccode\u003ehomepage\u003c/code\u003e);\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eSource\u003c/code\u003e and \u003ccode\u003eGitHub\u003c/code\u003e are both normalized into their respective forms,\nbut \u003ccode\u003egithub\u003c/code\u003e is \u003cstrong\u003enot\u003c/strong\u003e transformed into \u003ccode\u003esource\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eAnother Service\u003c/code\u003e is \u003cstrong\u003enot\u003c/strong\u003e normalized, since its normal form\n(\u003ccode\u003eanotherservice\u003c/code\u003e) is not a \u003ca href=\"#id29\"\u003e\u003cspan id=\"user-content-id30\"\u003e:ref:`well-known label \u0026lt;well-known\u0026gt;`\u003c/span\u003e\u003c/a\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003ca name=\"user-content-copyright\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCopyright\u003c/h2\u003e\u003ca id=\"user-content-copyright\" class=\"anchor\" aria-label=\"Permalink: Copyright\" href=\"#copyright\"\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\"\u003eThis document is placed in the public domain or under the\nCC0-1.0-Universal license, whichever is more 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