{"id":17665,"date":"2022-10-26T12:50:38","date_gmt":"2022-10-26T07:20:38","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-why-do-keys-and-items-methods-return-different-boolean-values-for-same-key-python-3-6-closed\/"},"modified":"2022-10-26T12:50:38","modified_gmt":"2022-10-26T07:20:38","slug":"solved-why-do-keys-and-items-methods-return-different-boolean-values-for-same-key-python-3-6-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-do-keys-and-items-methods-return-different-boolean-values-for-same-key-python-3-6-closed\/","title":{"rendered":"[Solved] Why do keys() and items() methods return different Boolean values for same key? (Python 3.6) [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-45233341\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"45233341\" data-parentid=\"45233283\" data-score=\"0\" data-position-on-page=\"2\" data-highest-scored=\"0\" data-question-has-accepted-highest-score=\"0\" itemprop=\"suggestedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p><code>items()<\/code> contains <strong>tuples<\/strong>, key-value pairs:<\/p>\n<pre><code>&gt;&gt;&gt; spam.items()\ndict_items([('name', 'Zophie'), ('age', 7)])\n<\/code><\/pre>\n<p>Your key is not such a tuple. It may be <em>contained<\/em> in one of the tuples, but <code>in<\/code> does not test for containment recursively.<\/p>\n<p>Either test for the correct key-value tuple:<\/p>\n<pre><code>&gt;&gt;&gt; ('name', 'Zophie') in spam.items()\nTrue\n<\/code><\/pre>\n<p>or if you can&#8217;t get access to just the <code>keys()<\/code> dictionary view, use the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.python.org\/3\/library\/functions.html#any\"><code>any()<\/code> function<\/a> to test each pair individually (iteration is halted early when a match is found):<\/p>\n<pre><code>&gt;&gt;&gt; any('name' in pair for pair in spam.items())\nTrue\n<\/code><\/pre>\n<p>or<\/p>\n<pre><code>&gt;&gt;&gt; any(key == 'name' for key, value in spam.items())\nTrue\n<\/code><\/pre>\n<p>On a separate note, if all you are doing is testing for a key, then just use <code>key in dictionary<\/code>. There is <em>no need<\/em> to create a separate dictionary view over the keys for that case; it&#8217;s just a waste of Python cycles and memory as containment testing against the dictionary achieves the exact same result.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Why do keys() and items() methods return different Boolean values for same key? (Python 3.6) [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] items() contains tuples, key-value pairs: &gt;&gt;&gt; spam.items() dict_items([(&#8216;name&#8217;, &#8216;Zophie&#8217;), (&#8216;age&#8217;, 7)]) Your key is not such a tuple. It may be contained in one of the tuples, but in does not test for containment recursively. Either test for the correct key-value tuple: &gt;&gt;&gt; (&#8216;name&#8217;, &#8216;Zophie&#8217;) in spam.items() True or if you can&#8217;t get access &#8230; <a title=\"[Solved] Why do keys() and items() methods return different Boolean values for same key? (Python 3.6) [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-why-do-keys-and-items-methods-return-different-boolean-values-for-same-key-python-3-6-closed\/\" aria-label=\"More on [Solved] Why do keys() and items() methods return different Boolean values for same key? (Python 3.6) [closed]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[834,4365,1255,349],"class_list":["post-17665","post","type-post","status-publish","format-standard","hentry","category-solved","tag-dictionary","tag-items","tag-key","tag-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Why do keys() and items() methods return different Boolean values for same key? 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