{"id":23506,"date":"2022-11-26T11:57:27","date_gmt":"2022-11-26T06:27:27","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-understand-python-syntax-reduce-lambda\/"},"modified":"2022-11-26T11:57:27","modified_gmt":"2022-11-26T06:27:27","slug":"solved-understand-python-syntax-reduce-lambda","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-understand-python-syntax-reduce-lambda\/","title":{"rendered":"[Solved] Understand python syntax reduce lambda"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-49937440\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"49937440\" data-parentid=\"49937293\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" 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>set(y) | x<\/code> is the union of <code>set(y)<\/code> and <code>x<\/code>.<\/p>\n<p>The <code>set()<\/code> at the end is the initial value for <code>reduce()<\/code>, the first value of <code>x<\/code> that will be used so that the function can get going. The first value in <code>structures<\/code> will be the first value of <code>y<\/code>.<\/p>\n<p>If you left out the initial value, i.e. something like:<\/p>\n<pre><code>charset = list(reduce(lambda x, y: set(y) | set(x), structures))\n<\/code><\/pre>\n<p>then if <code>structures<\/code> is empty this will raise:<\/p>\n<pre><code>TypeError: reduce() of empty sequence with no initial value\n<\/code><\/pre>\n<p>and if <code>structures<\/code> has length one then <code>reduce<\/code> will just return the one element, not converted to a set.<\/p>\n<p>In general <code>|<\/code> is the bitwise OR operator but sets override several operators for their own meaning. For future reference the character is called a pipe, so for example searching for &#8220;python set pipe&#8221; yields some answers.<\/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 Understand python syntax reduce lambda <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] set(y) | x is the union of set(y) and x. The set() at the end is the initial value for reduce(), the first value of x that will be used so that the function can get going. The first value in structures will be the first value of y. If you left out the &#8230; <a title=\"[Solved] Understand python syntax reduce lambda\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-understand-python-syntax-reduce-lambda\/\" aria-label=\"More on [Solved] Understand python syntax reduce lambda\">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":[349],"class_list":["post-23506","post","type-post","status-publish","format-standard","hentry","category-solved","tag-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Understand python syntax reduce lambda - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-understand-python-syntax-reduce-lambda\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Understand python syntax reduce lambda - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] set(y) | x is the union of set(y) and x. The set() at the end is the initial value for reduce(), the first value of x that will be used so that the function can get going. The first value in structures will be the first value of y. If you left out the ... 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