{"id":10330,"date":"2022-09-23T09:38:52","date_gmt":"2022-09-23T04:08:52","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-confusing-python-cannot-convert-string-to-float\/"},"modified":"2022-09-23T09:38:52","modified_gmt":"2022-09-23T04:08:52","slug":"solved-confusing-python-cannot-convert-string-to-float","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-confusing-python-cannot-convert-string-to-float\/","title":{"rendered":"[Solved] Confusing python &#8211; Cannot convert string to float"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-19736891\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"19736891\" data-parentid=\"19736589\" data-score=\"4\" 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>The problem is exactly what the Traceback log says: <code>Could not convert string to float<\/code><\/p>\n<ul>\n<li>If you have a string with only numbers, python&#8217;s smart enough to do what you&#8217;re trying and converts the string to a float.<\/li>\n<li>If you have a string with non-numerical characters, the conversion will fail and give you the error that you were having.<\/li>\n<\/ul>\n<p>The way most people would approach this problem is with a <code>try\/except<\/code> (see <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/docs.python.org\/3\/tutorial\/errors.html\">here<\/a>), or using the <code>isdigit()<\/code> function (see <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.tutorialspoint.com\/python\/string_isdigit.htm\">here<\/a>).<\/p>\n<p><strong>Try\/Except<\/strong><\/p>\n<pre><code>try:\n    miles = float(input(\"How many miles can you walk?: \"))\nexcept:\n    print(\"Please type in a number!\")\n<\/code><\/pre>\n<p><strong>Isdigit()<\/strong><\/p>\n<pre><code>miles = input(\"How many miles can you walk?: \")\nif not miles.isdigit():\n    print(\"Please type a number!\")\n<\/code><\/pre>\n<p>Note that the latter will still return false if there are decimal points in the string<\/p>\n<h2>EDIT<\/h2>\n<p>Okay, I won&#8217;t be able to get back to you for a while, so I&#8217;ll post the answer just in case.<\/p>\n<pre><code>while True:\n    try:\n        miles = float(input(\"How many miles can you walk?: \"))\n        break\n    except:\n        print(\"Please type in a number!\")\n\n#All of the ifs and stuff\n<\/code><\/pre>\n<p>The code&#8217;s really simple:<\/p>\n<ul>\n<li>It will keep trying to convert the input to a float, looping back to the beginning if it fails.<\/li>\n<li>When eventually it succeeds, it&#8217;ll break from the loop and go to the code you put lower down.<\/li>\n<\/ul>\n<\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">4<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Confusing python &#8211; Cannot convert string to float <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] The problem is exactly what the Traceback log says: Could not convert string to float If you have a string with only numbers, python&#8217;s smart enough to do what you&#8217;re trying and converts the string to a float. If you have a string with non-numerical characters, the conversion will fail and give you the &#8230; <a title=\"[Solved] Confusing python &#8211; Cannot convert string to float\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-confusing-python-cannot-convert-string-to-float\/\" aria-label=\"More on [Solved] Confusing python &#8211; Cannot convert string to float\">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":[412,349],"class_list":["post-10330","post","type-post","status-publish","format-standard","hentry","category-solved","tag-error-handling","tag-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Confusing python - Cannot convert string to float - 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-confusing-python-cannot-convert-string-to-float\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Confusing python - Cannot convert string to float - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The problem is exactly what the Traceback log says: Could not convert string to float If you have a string with only numbers, python&#8217;s smart enough to do what you&#8217;re trying and converts the string to a float. 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