{"id":3494,"date":"2021-04-23T12:55:19","date_gmt":"2021-04-23T07:25:19","guid":{"rendered":"https:\/\/python-programs.com\/?p=3494"},"modified":"2021-11-22T18:39:21","modified_gmt":"2021-11-22T13:09:21","slug":"python-programming-looping-techniques","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-programming-looping-techniques\/","title":{"rendered":"Python Programming \u2013 Looping Techniques"},"content":{"rendered":"<p>In this Page, We are Providing Python Programming \u2013 Looping Techniques. Students can visit for more Detail and Explanation of <a href=\"https:\/\/python-programs.com\/python-handwritten-notes\/\">Python Handwritten Notes<\/a>\u00a0Pdf.<\/p>\n<h2>Python Programming \u2013 Looping Techniques<\/h2>\n<p><strong>Looping techniques<\/strong><\/p>\n<p>The list can also be used in iteration operation, for example:<\/p>\n<pre>&gt;&gt;&gt; for a in [ 4 , 6 , 9 , 2 ] : print a\r\n4\r\n6\r\n9\r\n2\r\n&gt;&gt;&gt; for a in [ 4 , 6 , 9 , 2 ] : print a ,\r\n. . .\r\n4 6 9 2<\/pre>\n<p>When looping through a sequence, the position index and corresponding value can be retrieved at the same time using the enumerate ( ) function.<\/p>\n<pre>&gt;&gt;&gt; for i ,v in enumerate ( [ ' tic ' , ' tac ' , ' toe ' ] ) :\r\n. . . print i, v\r\n0 tic\r\n1 tac\r\n2 toe<\/pre>\n<p>To loop over two or more sequences at the same time, the entries can be paired with the zip () function.<\/p>\n<pre>&gt;&gt;&gt; questions= [ ' namer , ' quest ' , ' favorite color ' ]\r\n&gt;&gt;&gt; answers= [ ' lancelot ' , ' the holy grailblue ' ] \r\n&gt;&gt;&gt; for q,a in zip ( questions , answers ) :\r\n. . .   print 'What is your { 0 } ? It is { 1 }.'. format ( q , a) \r\nWhat is your name ? It is lancelot.\r\nWhat is your quest? It is the holy grail.\r\nWhat is your favorite color? It is blue.<\/pre>\n<p>While iterating a mutable sequence, if there is a need to change the sequence (for example to duplicate certain items), it is recommended to make a copy of the sequence before starting iteration. Looping over a sequence does not implicitly make a copy. The slice notation makes this especially convenient.<\/p>\n<pre>&gt;&gt;&gt; words= [ ' cat ' , ' window ' , ' defenestrate ' ]\r\n&gt;&gt;&gt; for w in words [ : ] :\r\n. . . if len ( w )&gt;6:\r\n. . . words. insert ( 0 , w )\r\n&gt;&gt;&gt; words\r\n[ ' defenestrate ' , ' cat ' , ' window ' , ' defenestrate ' ]<\/pre>\n<p><strong>Nested list<\/strong><\/p>\n<p>It is possible to nest lists (create list containing other lists), for example:<\/p>\n<pre>&gt;&gt;&gt; q= [ 2 , 3 ]\r\n&gt;&gt;&gt; p= [ 1 , q , 4 ]\r\n&gt;&gt;&gt; len ( p )\r\n3\r\n&gt;&gt;&gt; p [ 1 ]\r\n[ 2 , 3 ]\r\n&gt;&gt;&gt; p [ 1 ] [ 0 ]\r\n2\r\n&gt;&gt;&gt; p [ 1 ] . append ( ' xtra ' )\r\n&gt;&gt;&gt; p\r\n[ 1 , [ 2 , 3 , ' xtra ' ] , 4 ]\r\n&gt;&gt;&gt; q\r\n[ 2 , 3 , ' xtra ' ]<\/pre>\n<p>Note that in the last example, p [ 1 ] and q refer to the same object, which can be cross-checked using the id ( ) built-in function.<\/p>\n<pre>&gt;&gt;&gt; id ( q )\r\n104386192\r\n&gt;&gt;&gt; id (p [1] )\r\n104386192<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>In this Page, We are Providing Python Programming \u2013 Looping Techniques. 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Python Programming \u2013 Looping Techniques Looping techniques The list can also be used in iteration operation, for example: &gt;&gt;&gt; for a in [ 4 , 6 , 9 , 2 ] : &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-programming-looping-techniques\/\"> <span class=\"screen-reader-text\">Python Programming \u2013 Looping Techniques<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python Programming \u2013 Looping Techniques - Python Programs<\/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:\/\/python-programs.com\/python-programming-looping-techniques\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python Programming \u2013 Looping Techniques - Python Programs\" \/>\n<meta property=\"og:description\" content=\"In this Page, We are Providing Python Programming \u2013 Looping Techniques. 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