{"id":3832,"date":"2017-10-04T02:13:41","date_gmt":"2017-10-04T02:13:41","guid":{"rendered":"http:\/\/www.jquery-az.com\/?p=3832"},"modified":"2023-04-05T14:44:47","modified_gmt":"2023-04-05T14:44:47","slug":"python-input-vs-raw_input-function-python-3-input-vs-raw_input-functions-getting-keyboard-prompt-values","status":"publish","type":"post","link":"https:\/\/www.jquery-az.com\/python-input-vs-raw_input-function-python-3-input-vs-raw_input-functions-getting-keyboard-prompt-values\/","title":{"rendered":"Python input vs raw_input function"},"content":{"rendered":"<p>In your Python programs, you may need to take the user input from the users for performing certain actions. For example, asking a user to enter their names, age, Zip code etc.<\/p>\n<p>The Python 3 input function enables us to take the user input from the keyboard. As a line of code containing the input function executes, the user will be prompted to enter the required information.<\/p>\n<p><em>The input method takes the input (generally what the user types), and returns it back as a string.<\/em><\/p>\n<p><strong>The Syntax:<\/strong><\/p>\n<blockquote><p>input([prompt])<\/p><\/blockquote>\n<p>The prompt is an optional parameter. If this is given, it is written to the standard output without a trailing newline.<\/p>\n<p>I will show you examples of using the Python input function with leap years, square roots and other in the later part of this tutorial, first, let me explain the difference between the Python raw_input and input functions.<\/p>\n<h3><strong>The difference between input and raw_input<\/strong><\/h3>\n<ul>\n<li>The raw_input function was built in Python 2. It is deprecated in version 3.<\/li>\n<li>The raw_input worked the same way as input() function in Python 3 works. Alternatively, you can say the raw_input is renamed to input function Python version 3.<\/li>\n<li>In Python 2, the input() function was used to first take the raw_input() and then performing an eval() in it i.e. <strong>eval(raw_input(prompt))<\/strong> was equivalent to <strong>input(prompt)<\/strong>.<\/li>\n<li>In Python 3, the purpose of input() in Python 2 is removed and the same result can be achieved by using the eval(input()).<\/li>\n<\/ul>\n<p>Now, let us see a few examples of using the input Python function.<\/p>\n<h3><strong>An example of checking the leap year using Python input function<\/strong><\/h3>\n<p>As you run the following program, the user will be asked to enter a year. As you enter the year and press the enter key, the entered value of the year will be calculated to check whether it is a leap year or not and the result will be displayed on the\u00a0screen. Have a look:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#A Demo of telling leap year with input function\r\n\r\ntry:\r\n\r\n\u00a0\u00a0\u00a0 a_Year = float(input(\"Enter a Year? \"))\r\n\r\n\r\n\r\nexcept ValueError:\r\n\r\n\r\n\r\n\u00a0\u00a0\u00a0 print (\"Must enter digits!\")\r\n\r\n\r\n\r\nelse:\r\n\r\n\u00a0\u00a0\u00a0 Leap_Year = a_Year%4 == 0\r\n\r\n\u00a0\u00a0\u00a0 if Leap_Year:\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 print (\"This is a leap year\")\r\n\r\n\u00a0\u00a0\u00a0 else:\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 print (\"This is not a leap year\")<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-3833 size-full\" src=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.1-Python-input.png\" alt=\"Python input\" width=\"374\" height=\"202\" srcset=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.1-Python-input.png 374w, https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.1-Python-input-300x162.png 300w\" sizes=\"(max-width: 374px) 100vw, 374px\" \/><\/p>\n<h3><strong>An example of calculating the square root by user input<\/strong><\/h3>\n<p>In this example, <a href=\"\/3-examples-python-square-root-sqrt-function\/\">the square root of the given number is calculated<\/a> and displayed after a user enters a valid number.<\/p>\n<p>As returned value by input Python method is a string, so this is first converted to a float and then sqrt() function is used to calculate the square root of the given number. The <a href=\"\/3-examples-python-square-root-sqrt-function\/\">sqrt()<\/a> function is the part of math module, so it is also imported.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">import math\r\n\r\ntry:\r\n\r\n\r\n\u00a0\u00a0\u00a0 sqrt_num = float(input(\"Please Enter a number for calculating the square root? \"))\r\n\r\nexcept ValueError:\r\n\r\n\u00a0\u00a0\u00a0 print (\"Only numbers are allowed - No strings or other characters!\")\r\n\r\nelse:\r\n\r\n\u00a0\u00a0\u00a0 print (\"The Square root of\",sqrt_num ,\"=\" ,math.sqrt(sqrt_num))<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-3834\" src=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.2-Python-input-sqrt.png\" alt=\"input sqrt\" width=\"609\" height=\"202\" srcset=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.2-Python-input-sqrt.png 609w, https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.2-Python-input-sqrt-300x100.png 300w\" sizes=\"(max-width: 609px) 100vw, 609px\" \/><\/p>\n<p>You can see, the code is placed inside the try-except block, so if a user accidentally enters a wrong value like a string, the program will not crash. Instead, a descriptive message is displayed, notifying the user about the mistake.<\/p>\n<h3><strong>A demo of multiple input functions<\/strong><\/h3>\n<p>As you run this simple program, it will ask the name, age and favorite color by the user. Upon entering all information, the program will display the information:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">Y_name = input(\"What is your name? \")\r\n\r\n\r\n\r\nY_age = input(\"What is your age? \")\r\n\r\n\r\n\r\nY_color = input (\"What is your favorite color?\")\r\n\r\n\r\n\r\nprint (\"Welcome, %s.\" % Y_name)\r\n\r\n\r\n\r\nprint (\"Your age is %s\" % Y_age)\r\n\r\n\r\n\r\nprint (\"Your favorite color is %s\" % Y_color)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-3835\" src=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.3-Python-input-multiple.png\" alt=\"input multiple\" width=\"402\" height=\"202\" srcset=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.3-Python-input-multiple.png 402w, https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.3-Python-input-multiple-300x151.png 300w\" sizes=\"(max-width: 402px) 100vw, 402px\" \/><\/p>\n<h3><strong>An example of using eval function with input <\/strong><\/h3>\n<p>In the following example, the square of a given number is calculated and displayed by using the input function with eval(). I am just showing the very simple use of eval() function while it is a big topic and require its own chapter.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#The input with eval function example\r\n\r\n\r\n\r\na_num = eval(input('Give a number to be squared? '))\r\n\r\nb_squ = a_num*a_num\r\n\r\nprint (\"The square of the\",a_num ,\"is\" , b_squ)<\/pre>\n<p><strong>Result:<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-3836\" src=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.4-Python-input-eval.png\" alt=\"input eval\" width=\"420\" height=\"202\" srcset=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.4-Python-input-eval.png 420w, https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/28.4-Python-input-eval-300x144.png 300w\" sizes=\"(max-width: 420px) 100vw, 420px\" \/><\/p>\n<p>You may place an error handler like the above examples to avoid calculating a non-numeric value.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Python 3 input function enables us to take the user input from the keyboard. As a line of code containing the input function executes, the user will be prompted to enter the required information.<\/p>\n","protected":false},"author":1,"featured_media":3833,"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 3 input VS raw_input functions for getting keyboard prompt values<\/title>\n<meta name=\"description\" content=\"The Python 3 input function enables us to take the user input from the keyboard. 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