But even the RE were several times faster, Id only use it if this were a bottleneck. I much prefer writing in Python. Series. Idiom 137 Check if string contains only digits.The method isdigit() checks whether the string consists of digits only. 3. not preceded or I remembered that Python has a function to do that. How do you check if a string contains ONLY numbers - python.It supports str, and Unicode, and will work in Python 3 and Python 2. Python has a handy built-in function, str.isdigit, that lets you check if a string is a digit. Obj-C. PHP. Python. Ruby. Or search : Idiom 137 Check if string contains only digits. Youll want to use the isdigit method on your str object: If len(isbn) 10 and isbn.isdigit(): From the isdigit documentation: Str.
isdigit(). Return true if all characters in the string are digits and there is at least one character, false otherwise.s"1234" try: numint(s) print "S contains only digits" except: print "S doesnt contain digits ONLY". I want to check if a password contains special characters. I have googled for a few examples but cant find that addresses my problem.Privacy: Your email address will only be used for sending these notifications. If the string contains only digit returns True otherwise False.isdecimal () method checks whether the string contains only decimal characters. This method exists only in unicode object. In Python, how do you check if a string contains only certain characters? I need to check a string containing only az, 09, and. (period) and noMy goal is to accept four-digit numbers , and four strings . ( "string must not contain numbers or special characters") If an invalid entry is given, the