Testing whether a Python string contains an integer

If you want to check whether a Python string contains a integer, you can try casting to an int with int() and catching the ValueError if it’s not an integer. Alternatively, you can use the str.isdigit() method. It will “return true if all characters in the string are digits and there is at least one character, false otherwise.” However, isdigit will only work for positive integers (and for those in base-10 or lower).

Thanks to Jeremy Kahn for reminding me that isdigit only detects positive integers.