{"id":6524,"date":"2018-11-12T04:25:16","date_gmt":"2018-11-12T04:25:16","guid":{"rendered":"https:\/\/www.jquery-az.com\/?p=6524"},"modified":"2022-10-09T18:16:10","modified_gmt":"2022-10-09T18:16:10","slug":"python-float","status":"publish","type":"post","link":"https:\/\/www.jquery-az.com\/python-float\/","title":{"rendered":"What is float function in Python?"},"content":{"rendered":"<p>The Python float function converts a given value into the float. The float function takes an argument that can be a number or string with the decimal point. For example:<\/p>\n<blockquote><p>flt_num = float(10)<\/p>\n<p>flt_str = float(\u201c10.5\u201d)<\/p><\/blockquote>\n<h3><strong>Syntax of using float function<\/strong><\/h3>\n<blockquote><p>class float([x])<\/p><\/blockquote>\n<p>Where <strong>x<\/strong>\u00a0argument rules are as follows:<\/p>\n<ul>\n<li>If x is a string then it should be a decimal number.<\/li>\n<li>For a string, you may optionally use a <strong>\u2018+\u2019<\/strong> or <strong>\u2018\u2013\u2018 <\/strong>sign. Using the \u2018+\u2019 sign does not affect the result.<\/li>\n<li>If x is a string and contains leading or trailing spaces, these are removed.<\/li>\n<li>A string representing NaN (not-a-number) may also be used.<\/li>\n<li>An int or float number can be used as an argument. In that case, the floating point number with the same value is returned.<\/li>\n<\/ul>\n<h3><strong>An example of converting a string to float<\/strong><\/h3>\n<p>In the example below, we have a decimal number as a string that is used as an argument in the float Python function. The code and result are shown below:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Python float demos\r\n\r\n\r\n\r\nflt_x = float(\"43.59\")\r\n\r\nprint(\"The returned float number:\" ,flt_x)<\/pre>\n<p><strong>The result:<\/strong><\/p>\n<blockquote><p>The returned float number: 43.59<\/p><\/blockquote>\n<h3><strong>Using leading and trailing spaces in string example<\/strong><\/h3>\n<p>Now,\u00a0 I used leading and trailing spaces with a decimal number in the string. As mentioned earlier, the spaces should be removed by float function. See the code and output below:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Python float demos\r\n\r\nstr_num = \"\u00a0\u00a0 55.48\u00a0\u00a0 \"\r\n\r\nflt_spaces = float(str_num)\r\n\r\n\r\n\r\nprint(\"Original string:\" ,str_num)\r\n\r\nprint(\"After float function:\" ,flt_spaces)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-6525\" src=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2018\/11\/68.1-Python-float.png\" alt=\"Python float\" width=\"278\" height=\"104\" \/><\/p>\n<p>You see, the original string shows spaces while as I displayed the value after using float function, the spaces in left and right are removed.<\/p>\n<h3><strong>The example of using int and float <\/strong><\/h3>\n<p>This example shows the returned values after using an int and floating numbers in the float function.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">int_num = 35\r\n\r\nflt_num = 61.89\r\n\r\n\r\nprint(\"Int after float function:\" ,float(int_num))\r\n\r\nprint(\"Float number after:\" ,float(flt_num))<\/pre>\n<p><strong>The output:<\/strong><\/p>\n<blockquote><p>Int after float function: 35.0<\/p>\n<p>Float number after: 61.89<\/p><\/blockquote>\n<h3><strong>An example of checking if a value is NaN<\/strong><\/h3>\n<p>The example below uses math module and checks if the value is NaN by float function:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">import math\r\n\r\nprint (math.isnan(float('NaN')))\r\n\r\n\r\nprint (math.isnan(25.0))<\/pre>\n<p><strong>The result:<\/strong><\/p>\n<blockquote><p>True<\/p>\n<p>False<\/p><\/blockquote>\n<h3><strong>What if an alphabet is used in float function?<\/strong><\/h3>\n<p>A <strong>ValueError<\/strong> will be generated if alphabets are given in the float function. Have a look at an example below:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">str_flt = \"test\"\r\n\r\nprint (float(str_flt))<\/pre>\n<p><strong>The output:<\/strong><\/p>\n<blockquote><p>ValueError: could not convert string to float: &#8216;test&#8217;<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>The Python float function converts a given value into float. The float function takes an argument that can be a number or string with decimal point. <\/p>\n","protected":false},"author":1,"featured_media":6525,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[17],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python Float [5 Examples to Learn it]<\/title>\n<meta name=\"description\" content=\"The Python float function converts a given value into float. 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