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Apr 25, 2014 · You can make the input statement a while True loop so it repeatedly asks for the users input and then break that loop if the user enters the response you would like. And you can use try and except blocks to handle invalid responses. while True: var = True. try: age = int(input("Please enter your age: "))
Jul 19, 2015 · Explanation. You are searching for the regular expression ^.*$, which is esentially every line. ^ marks the beginning of a line, .* includes any character any number of times and $ marks the end of the line. Thus, this regular expression finds all content on every line.
Jan 8, 2015 · To validate the user entry and ensure that is a number it is possible to. try: value=int (input ("Type a number:")) except ValueError: print ("This is not a whole number.") See how we can use this approach to define our own function (called ) to ask for a number.
Jan 28, 2020 · If you still want to go on to a new line at the end of the loop, you must include a print function that does advance to the next line, once, after the loop. Try this variation, endSpace2.py def listOnOneLine ( items ): for item in items : print ( item , end = ' ' ) print () listOnOneLine ([ 'apple' , 'banana' , 'pear' ]) print ( 'This is ...
Jul 3, 2021 · To read specific lines from a text file, Please follow these steps: Open file in Read Mode. To open a file pass file path and access mode r to the open() function. The access mode specifies the operation you wanted to perform on the file, such as reading or writing. For example, fp= open(r'File_Path', 'r') to read a file.
Jun 9, 2016 · If I use cat -n text.txt to automatically number the lines, how do I then use the command to show only certain numbered lines.
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Jan 14, 2015 · I need a regular expression for a password field. The requirement is: The password Must be 8 to 20 characters in length Must contain at least one letter and one number and a special character fro...