python - Adding dictionaries together

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Something like this pseudo-Python would be nice:

dic0 = {'dic0': 0}
dic1 = {'dic1': 1}

ndic = dic0 + dic1
# ndic would equal {'d..." /> <script id="webpack-public-path" type="text/uri-list">https://cdn.sstatic.net/</script> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script defer src="https://cdn.sstatic.net/Js/third-party/npm/@stackoverflow/stacks/dist/js/stacks.min.js?v=90a447add688"></script> <script src="https://cdn.sstatic.net/Js/stub.en.js?v=30464efc364f"></script> <link rel="stylesheet" type="text/css" href="https://cdn.sstatic.net/Shared/stacks.css?v=bd2aba62c5a4"> <link rel="stylesheet" type="text/css" href="https://cdn.sstatic.net/Sites/stackoverflow/primary.css?v=cc49ce762956"> <script> StackExchange.ready(function () { StackExchange.using("snippets", function () { StackExchange.snippets.initSnippetRenderer(); }); StackExchange.using("postValidation", function () { StackExchange.postValidation.initOnBlurAndSubmit($('#post-form'), 2, 'answer'); }); 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22:04:11Z"> <span class="fc-black-400 mr2">Asked</span> <time itemprop="dateCreated" datetime="2011-05-14T22:04:11">13 years, 9 months ago</time> </div> <div class="flex--item ws-nowrap mr16 mb8"> <span class="fc-black-400 mr2">Modified</span> <a href="?lastactivity" class="s-link s-link__inherit" title="2023-01-10 03:17:20Z">2 years, 1 month ago</a> </div> <div class="flex--item ws-nowrap mb8" title="Viewed 178,985 times"> <span class="fc-black-400 mr2">Viewed</span> 179k times </div> </div> <div id="mainbar" role="main" aria-label="question and answers"> <div class="question js-question" data-questionid="6005066" data-position-on-page="0" data-score="138" id="question"> <style> </style> <div class="js-zone-container zone-container-main"> <div id="dfp-tlb" class="everyonelovesstackoverflow everyoneloves__top-leaderboard everyoneloves__leaderboard"></div> <div class="js-report-ad-button-container " style="width: 728px"></div> </div> <div class="post-layout "> <div class="votecell 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href="/questions/1781571/how-to-concatenate-two-dictionaries-to-create-a-new-one" dir="ltr">How to concatenate two dictionaries to create a new one? [duplicate]</a> <span class="question-originals-answer-count"> (5 answers) </span> </div> <div class="flex--item mb0 mt8">Closed <span title='2015-06-24 16:30:42Z' class='relativetime'>9 years ago</span>.</div> </div> </aside> </div> <p>I have two dictionaries and I'd like to be able to make them one:</p> <p>Something like this pseudo-Python would be nice:</p> <pre><code>dic0 = {'dic0': 0} dic1 = {'dic1': 1} ndic = dic0 + dic1 # ndic would equal {'dic0': 0, 'dic1': 1} </code></pre> </div> <div class="mt24 mb12"> <div class="post-taglist d-flex gs4 gsy fd-column"> <div class="d-flex ps-relative fw-wrap"> <ul class='ml0 list-ls-none js-post-tag-list-wrapper d-inline'><li class='d-inline mr4 js-post-tag-list-item'><a href="/questions/tagged/python" class="s-tag post-tag" title="show questions tagged 'python'" aria-label="show questions tagged 'python'" rel="tag" aria-labelledby="tag-python-tooltip-container" data-tag-menu-origin="Unknown">python</a></li><li class='d-inline mr4 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</div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">@Sam Possible problem: {'dic0':0} + {'dic0':1}. What to do?</span> <div class="d-inline-flex ai-center"> – <a href="/users/4306257/palsch" title="7,046 reputation" class="comment-user">palsch</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2016-04-08 18:58:42Z, License: CC BY-SA 3.0' class='relativetime-clean'>Apr 8, 2016 at 18:58</span> </span> </div> </div> </li> <li id="comment-61219334" class="comment js-comment " data-comment-id="61219334" data-comment-owner-id="150999" data-comment-score="3"> <div class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> <span title="number of 'useful comment' votes received" class="cool">3</span> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">@palsch {'dic0':0} + {'dic0':1} should be equivalent to d={'dic0':0}; d.update({'dic0':1}) ?</span> <div class="d-inline-flex ai-center"> – <a href="/users/150999/sam" title="1,886 reputation" class="comment-user">Sam</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2016-04-24 13:56:35Z, License: CC BY-SA 3.0' class='relativetime-clean'>Apr 24, 2016 at 13:56</span> </span> </div> </div> </li> <li id="comment-115922511" class="comment js-comment " data-comment-id="115922511" data-comment-owner-id="5388135" data-comment-score="2"> <div class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> <span title="number of 'useful comment' votes received" class="cool">2</span> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">Your syntax with the + operator is supported since Python 3.9, as per PEP 584</span> <div class="d-inline-flex ai-center"> – <a href="/users/5388135/martijnvanattekum" title="1,435 reputation" class="comment-user">MartijnVanAttekum</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2021-01-04 16:45:07Z, License: CC BY-SA 4.0' class='relativetime-clean'>Jan 4, 2021 at 16:45</span> </span> <span title="this comment was edited 1 time"> <svg aria-hidden="true" class="va-text-bottom o50 svg-icon iconPencilSm" width="14" height="14" viewBox="0 0 14 14"><path fill="#F1B600" d="m2 10.12 6.37-6.43 1.88 1.88L3.88 12H2z"/><path fill="#E87C87" d="m11.1 1.71 1.13 1.12c.2.2.2.51 0 .71L11.1 4.7 9.21 2.86l1.17-1.15c.2-.2.51-.2.71 0"/></svg> </span> </div> </div> </li> </ul> </div> <div id="comments-link-6005066" data-rep=50 data-anon=true> <a class="js-add-link comments-link disabled-link" title="Use comments to ask for more information or suggest improvements. 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class="user-action-time fl-grow1"> answered <span title='2011-05-14 22:33:38Z' class='relativetime'>May 14, 2011 at 22:33</span> </div> </div> <div class="user-gravatar32"> <a href="/users/177511/bluepnume"><div class="gravatar-wrapper-32"><img src="https://www.gravatar.com/avatar/701586486b117227002bcd1dc9af5cb1?s=64&d=identicon&r=PG" alt="bluepnume's user avatar" width="32" height="32" class="bar-sm"></div></a> </div> <div class="user-details" itemprop="author" itemscope itemtype="http://schema.org/Person"> <a href="/users/177511/bluepnume" dir="auto">bluepnume</a><span class="d-none" itemprop="name">bluepnume</span> <div class="-flair"> <span class="reputation-score" title="reputation score 17,128" dir="ltr">17.1k</span><span title="8 gold badges" aria-hidden="true"><span class="badge1"></span><span class="badgecount">8</span></span><span class="v-visible-sr">8 gold badges</span><span title="41 silver badges" aria-hidden="true"><span class="badge2"></span><span 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title="number of 'useful comment' votes received" class="warm">10</span> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">The first line fails if the keys are anything other than strings.</span> <div class="d-inline-flex ai-center"> – <a href="/users/247696/flimm" title="150,897 reputation" class="comment-user">Flimm</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2016-03-14 15:49:26Z, License: CC BY-SA 3.0' class='relativetime-clean'>Mar 14, 2016 at 15:49</span> </span> </div> </div> </li> <li id="comment-82495684" class="comment js-comment " data-comment-id="82495684" data-comment-owner-id="1449460" data-comment-score="2"> <div class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> <span title="number of 'useful comment' votes received" class="cool">2</span> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">@BerryTsakala The problem with <code>+</code> is what happens in case of conflicts ? <code>.update()</code> is properly asymmetric.</span> <div class="d-inline-flex ai-center"> – <a href="/users/1449460/nikana-reklawyks" title="3,404 reputation" class="comment-user">Nikana Reklawyks</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2017-12-12 07:33:28Z, License: CC BY-SA 3.0' class='relativetime-clean'>Dec 12, 2017 at 7:33</span> </span> </div> </div> </li> <li id="comment-109700821" class="comment js-comment " data-comment-id="109700821" data-comment-owner-id="2388257" data-comment-score="0"> <div class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">You can make it terser by replacing 1st example with <code>dic2 = {dic0, **dic1}</code></span> <div class="d-inline-flex ai-center"> – <a href="/users/2388257/hi-angel" title="5,629 reputation" class="comment-user">Hi-Angel</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2020-05-26 14:51:37Z, License: CC BY-SA 4.0' class='relativetime-clean'>May 26, 2020 at 14:51</span> </span> </div> </div> </li> <li id="comment-112749590" class="comment js-comment " data-comment-id="112749590" data-comment-owner-id="901641" data-comment-score="0"> <div class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">@NikanaReklawyks - Could either throw an exception (like <code>1/0</code> does) or just accept that it's asymmetric. Other implemented additions of non-numbers are already asymmetric - <code>[1] + [2]</code> is different from <code>[2] + [1]</code> and <code>'1' + '2'</code> is different from <code>'2' + '1'</code>.</span> <div class="d-inline-flex ai-center"> – <a href="/users/901641/artofwarfare" title="21,486 reputation" class="comment-user">ArtOfWarfare</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2020-09-06 02:30:48Z, License: CC BY-SA 4.0' class='relativetime-clean'>Sep 6, 2020 at 2:30</span> </span> </div> </div> </li> <li id="comment-113899071" class="comment js-comment " data-comment-id="113899071" data-comment-owner-id="474819" data-comment-score="8"> <div class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> <span title="number of 'useful comment' votes received" class="warm">8</span> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">@BerryTsakala you got your wish with python 3.9 :) But the operator is <code>|</code>, not <code>+</code>. <a href="https://docs.python.org/3/whatsnew/3.9.html" rel="nofollow noreferrer">docs.python.org/3/whatsnew/3.9.html</a></span> <div class="d-inline-flex ai-center"> – <a href="/users/474819/nate-glenn" title="6,744 reputation" class="comment-user">Nate Glenn</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2020-10-18 12:07:04Z, License: CC BY-SA 4.0' class='relativetime-clean'>Oct 18, 2020 at 12:07</span> </span> </div> </div> </li> </ul> </div> <div id="comments-link-6005217" data-rep=50 data-anon=true> <a class="js-add-link comments-link disabled-link" title="Use comments to ask for more information or suggest improvements. 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This is also the case for the other examples listed here.</p> <hr /> <p>Or create a new dict by adding both items.</p> <pre><code>ndic = dict(tuple(dic0.items()) + tuple(dic1.items())) </code></pre> <hr /> <p>If modifying <code>dic0</code> is OK:</p> <pre><code>dic0.update(dic1) </code></pre> <hr /> <p>If modifying <code>dic0</code> is <strong>NOT</strong> OK:</p> <pre><code>ndic = dic0.copy() ndic.update(dic1) </code></pre> <hr /> <p>If all the keys in one dict are ensured to be strings (<code>dic1</code> in this case, of course args can be swapped)</p> <pre><code>ndic = dict(dic0, **dic1) </code></pre> <hr /> <p>In some cases it may be handy to use dict comprehensions (Python 2.7 or newer),<br>Especially if you want to filter out or transform some keys/values at the same time.</p> <pre><code>ndic = {k: v for d in (dic0, dic1) for k, v in d.items()} </code></pre> </div> <div class="mt24"> <div class="d-flex fw-wrap ai-start jc-end gs8 gsy"> <time itemprop="dateCreated" 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data-gps-track="post.click({ item: 4, priv: 0, post_type: 2 })">edited <span title='2023-01-10 03:14:15Z' class='relativetime'>Jan 10, 2023 at 3:14</span></a> </div> </div> <div class="user-gravatar32"> </div> <div class="user-details"> <div class="-flair"> </div> </div> </div> </div> <div class="post-signature flex--item fl0"> <div class="user-info "> <div class="d-flex "> <div class="user-action-time fl-grow1"> answered <span title='2013-12-27 03:29:35Z' class='relativetime'>Dec 27, 2013 at 3:29</span> </div> </div> <div class="user-gravatar32"> <a href="/users/432509/ideasman42"><div class="gravatar-wrapper-32"><img src="https://i.sstatic.net/PsT5q.png?s=64" alt="ideasman42's user avatar" width="32" height="32" class="bar-sm"></div></a> </div> <div class="user-details" itemprop="author" itemscope itemtype="http://schema.org/Person"> <a href="/users/432509/ideasman42" dir="auto">ideasman42</a><span class="d-none" itemprop="name">ideasman42</span> <div class="-flair"> <span 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<div class="user-action-time fl-grow1"> answered <span title='2011-05-14 22:14:14Z' class='relativetime'>May 14, 2011 at 22:14</span> </div> </div> <div class="user-gravatar32"> <a href="/users/684799/vijay"><div class="gravatar-wrapper-32"><img src="https://www.gravatar.com/avatar/b2e52f5a4a2820829c9d5dc7d82b0feb?s=64&d=identicon&r=PG" alt="Vijay's user avatar" width="32" height="32" class="bar-sm"></div></a> </div> <div class="user-details" itemprop="author" itemscope itemtype="http://schema.org/Person"> <a href="/users/684799/vijay" dir="auto">Vijay</a><span class="d-none" itemprop="name">Vijay</span> <div class="-flair"> <span class="reputation-score" title="reputation score " dir="ltr">944</span><span title="7 silver badges" aria-hidden="true"><span class="badge2"></span><span class="badgecount">7</span></span><span class="v-visible-sr">7 silver badges</span><span title="14 bronze badges" aria-hidden="true"><span class="badge3"></span><span class="badgecount">14</span></span><span class="v-visible-sr">14 bronze badges</span> </div> </div> </div> </div> </div> </div> </div> <span class="d-none" itemprop="commentCount">3</span> <div class="post-layout--right js-post-comments-component"> <div id="comments-6005122" class="comments js-comments-container bt bc-black-200 mt12 " data-post-id="6005122" data-min-length="15"> <ul class="comments-list js-comments-list" data-remaining-comments-count="0" data-canpost="false" data-cansee="true" data-comments-unavailable="false" data-addlink-disabled="true"> <li id="comment-50676184" class="comment js-comment " data-comment-id="50676184" data-comment-owner-id="487464" data-comment-score="2"> <div class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> <span title="number of 'useful comment' votes received" class="cool">2</span> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">Note that the equivalent syntax for this in Python 3.x is <code>ndic = list(dict(dic0.items()) + list(dic1.items()))</code> since <code>.items()</code> not longer returns a list, but a (iterable)view</span> <div class="d-inline-flex ai-center"> – <a href="/users/487464/bryce-guinta" title="3,732 reputation" class="comment-user">Bryce Guinta</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2015-07-10 16:54:05Z, License: CC BY-SA 3.0' class='relativetime-clean'>Jul 10, 2015 at 16:54</span> </span> <span title="this comment was edited 2 times"> <svg aria-hidden="true" class="va-text-bottom o50 svg-icon iconPencilSm" width="14" height="14" viewBox="0 0 14 14"><path fill="#F1B600" d="m2 10.12 6.37-6.43 1.88 1.88L3.88 12H2z"/><path fill="#E87C87" d="m11.1 1.71 1.13 1.12c.2.2.2.51 0 .71L11.1 4.7 9.21 2.86l1.17-1.15c.2-.2.51-.2.71 0"/></svg> </span> </div> </div> </li> <li id="comment-64263739" class="comment js-comment " data-comment-id="64263739" data-comment-owner-id="113632" data-comment-score="3"> <div class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> <span title="number of 'useful comment' votes received" class="cool">3</span> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">@BryceGuinta I assume you meant <code>ndic = dict(list(dic0.items()) + list(dic1.items()))</code></span> <div class="d-inline-flex ai-center"> – <a href="/users/113632/dimo414" title="48,824 reputation" class="comment-user">dimo414</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2016-07-18 04:44:16Z, License: CC BY-SA 3.0' class='relativetime-clean'>Jul 18, 2016 at 4:44</span> </span> </div> </div> </li> <li id="comment-64678217" class="comment js-comment " data-comment-id="64678217" data-comment-owner-id="487464" data-comment-score="1"> <div class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> <span title="number of 'useful comment' votes received" class="cool">1</span> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">@dimo414 Yes, my bad. I can't change it now however. I use <a href="https://docs.python.org/3/library/collections.html#collections.ChainMap" rel="nofollow noreferrer">ChainMap</a> from <code>collections</code> to achieve this functionality now via <code>dict(ChainMap(dic1, dic0))</code>. However I have had to grab the source code from <a href="https://pypi.python.org/pypi/chainmap/1.0.2" rel="nofollow noreferrer">the chainmap pypi package</a> for Python2.7. Notice how I switched the order of the dicts. In the Vijay's example the rightmost keys' values overwrite the leftmost while ChainMap gets it right and the leftmost keys' values have precedence over the right.</span> <div class="d-inline-flex ai-center"> – <a href="/users/487464/bryce-guinta" title="3,732 reputation" class="comment-user">Bryce Guinta</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2016-07-28 22:33:50Z, License: CC BY-SA 3.0' class='relativetime-clean'>Jul 28, 2016 at 22:33</span> </span> <span title="this comment was edited 2 times"> <svg aria-hidden="true" class="va-text-bottom o50 svg-icon iconPencilSm" width="14" height="14" viewBox="0 0 14 14"><path fill="#F1B600" d="m2 10.12 6.37-6.43 1.88 1.88L3.88 12H2z"/><path fill="#E87C87" d="m11.1 1.71 1.13 1.12c.2.2.2.51 0 .71L11.1 4.7 9.21 2.86l1.17-1.15c.2-.2.51-.2.71 0"/></svg> </span> </div> </div> </li> </ul> </div> <div id="comments-link-6005122" data-rep=50 data-anon=true> <a class="js-add-link comments-link disabled-link" title="Use comments to ask for more information or suggest improvements. 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<div class="mt24"> <div class="d-flex fw-wrap ai-start jc-end gs8 gsy"> <time itemprop="dateCreated" datetime="2011-05-14T22:10:59"></time> <div class="flex--item mr16" style="flex: 1 1 100px;"> <div class="js-post-menu pt2" data-post-id="6005101" data-post-type-id="2"> <div class="d-flex gs8 s-anchors s-anchors__muted fw-wrap"> <div class="flex--item"> <a href="/a/6005101" rel="nofollow" itemprop="url" class="js-share-link js-gps-track" title="Short permalink to this answer" data-gps-track="post.click({ item: 2, priv: 0, post_type: 2 })" data-controller="se-share-sheet" data-se-share-sheet-title="Share a link to this answer" data-se-share-sheet-subtitle="" data-se-share-sheet-post-type="answer" data-se-share-sheet-social="facebook twitter devto" data-se-share-sheet-location="2" data-se-share-sheet-license-url="https%3a%2f%2fcreativecommons.org%2flicenses%2fby-sa%2f3.0%2f" data-se-share-sheet-license-name="CC BY-SA 3.0" data-s-popover-placement="bottom-start">Share</a> </div> <div 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answered <span title='2011-05-14 22:10:59Z' class='relativetime'>May 14, 2011 at 22:10</span> </div> </div> <div class="user-gravatar32"> <a href="/users/151019/mmmmmm"><div class="gravatar-wrapper-32"><img src="https://www.gravatar.com/avatar/ab97924548209ed725801c0a08c40d1e?s=64&d=identicon&r=PG" alt="mmmmmm's user avatar" width="32" height="32" class="bar-sm"></div></a> </div> <div class="user-details" itemprop="author" itemscope itemtype="http://schema.org/Person"> <a href="/users/151019/mmmmmm" dir="auto">mmmmmm</a><span class="d-none" itemprop="name">mmmmmm</span> <div class="-flair"> <span class="reputation-score" title="reputation score 32,701" dir="ltr">32.7k</span><span title="28 gold badges" aria-hidden="true"><span class="badge1"></span><span class="badgecount">28</span></span><span class="v-visible-sr">28 gold badges</span><span title="91 silver badges" aria-hidden="true"><span class="badge2"></span><span class="badgecount">91</span></span><span class="v-visible-sr">91 silver badges</span><span title="122 bronze badges" aria-hidden="true"><span class="badge3"></span><span class="badgecount">122</span></span><span class="v-visible-sr">122 bronze badges</span> </div> </div> </div> </div> </div> </div> </div> <span class="d-none" itemprop="commentCount">1</span> <div class="post-layout--right js-post-comments-component"> <div id="comments-6005101" class="comments js-comments-container bt bc-black-200 mt12 " data-post-id="6005101" data-min-length="15"> <ul class="comments-list js-comments-list" data-remaining-comments-count="0" data-canpost="false" data-cansee="true" data-comments-unavailable="false" data-addlink-disabled="true"> <li id="comment-6938151" class="comment js-comment " data-comment-id="6938151" data-comment-owner-id="39153" data-comment-score="8"> <div class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> <span title="number of 'useful comment' votes received" class="warm">8</span> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">Nice, although it modifies dic0. I'm not sure if that is acceptable to the original poster.</span> <div class="d-inline-flex ai-center"> – <a href="/users/39153/mseery" title="1,444 reputation" class="comment-user">mseery</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2011-05-14 22:35:02Z, License: CC BY-SA 3.0' class='relativetime-clean'>May 14, 2011 at 22:35</span> </span> </div> </div> </li> </ul> </div> <div id="comments-link-6005101" data-rep=50 data-anon=true> <a class="js-add-link comments-link disabled-link" title="Use comments to ask for more information or suggest improvements. 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data-ks-title="timeline" data-controller="s-tooltip" data-s-tooltip-placement="right" title="Show activity on this post." aria-label="Timeline"><svg aria-hidden="true" class="mln2 mr0 svg-icon iconHistory" width="19" height="18" viewBox="0 0 19 18"><path d="M3 9a8 8 0 1 1 3.73 6.77L8.2 14.3A6 6 0 1 0 5 9l3.01-.01-4 4-4-4zm7-4h1.01L11 9.36l3.22 2.1-.6.93L10 10z"/></svg></a> </div> </div> <div class="answercell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <pre><code>dic0.update(dic1) </code></pre> <p>Note this doesn't actually return the combined dictionary, it just mutates <code>dic0</code>.</p> </div> <div class="mt24"> <div class="d-flex fw-wrap ai-start jc-end gs8 gsy"> <time itemprop="dateCreated" datetime="2011-05-14T22:11:12"></time> <div class="flex--item mr16" style="flex: 1 1 100px;"> <div class="js-post-menu pt2" data-post-id="6005104" data-post-type-id="2"> <div class="d-flex gs8 s-anchors s-anchors__muted fw-wrap"> <div class="flex--item"> <a 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So, the code would be:</p> <pre><code>dic0 = {'dic0': 0} dic1 = {'dic1': 1} dic2 = dict(dic0.items() + dic1.items()) </code></pre> <p>I tested this in IDLE and it works fine. However, the previous question on this topic states that this method is slow and chews up memory. There are several other ways recommended there, so please see that if memory usage is important.</p> </div> <div class="mt24"> <div class="d-flex fw-wrap ai-start jc-end gs8 gsy"> <time itemprop="dateCreated" datetime="2011-05-14T22:15:43"></time> <div class="flex--item mr16" style="flex: 1 1 100px;"> <div class="js-post-menu pt2" data-post-id="6005129" data-post-type-id="2"> <div class="d-flex gs8 s-anchors s-anchors__muted fw-wrap"> <div class="flex--item"> <a href="/a/6005129" rel="nofollow" itemprop="url" class="js-share-link js-gps-track" title="Short permalink to this answer" data-gps-track="post.click({ item: 2, priv: 0, post_type: 2 })" data-controller="se-share-sheet" data-se-share-sheet-title="Share a link to this answer" data-se-share-sheet-subtitle="" data-se-share-sheet-post-type="answer" data-se-share-sheet-social="facebook twitter devto" data-se-share-sheet-location="2" data-se-share-sheet-license-url="https%3a%2f%2fcreativecommons.org%2flicenses%2fby-sa%2f4.0%2f" 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class="js-comment-actions comment-actions"> <div class="comment-score js-comment-score js-comment-edit-hide"> <span title="number of 'useful comment' votes received" class="cool">3</span> </div> </div> <div class="comment-text js-comment-text-and-form"> <div class="comment-body js-comment-edit-hide"> <span class="comment-copy">FYI, this creates a list of tuples, you'd need to run <code>dict(dic0.items() + dic1.items())</code></span> <div class="d-inline-flex ai-center"> – <a href="/users/177511/bluepnume" title="17,128 reputation" class="comment-user">bluepnume</a> </div> <span class="comment-date" dir="ltr"> <span class="v-visible-sr">Commented</span> <span title='2011-05-14 22:30:49Z, License: CC BY-SA 3.0' class='relativetime-clean'>May 14, 2011 at 22:30</span> </span> <span title="this comment was edited 1 time"> <svg aria-hidden="true" class="va-text-bottom o50 svg-icon iconPencilSm" width="14" height="14" viewBox="0 0 14 14"><path fill="#F1B600" d="m2 10.12 6.37-6.43 1.88 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