Question

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Python – How to check if input is a number (given that input always returns strings)

I need to check a input and send a error message if it’s not numerical. How would i do this the best way? Cant seem to find any other posts about it thou i’m shure someone must have asked this question before.

Answer 1

 if not value.isdigit():
     raise ValueError("Input must be numeric")

@TokenMacGuy’s solution is better if you’re getting your input from raw_input(), but otherwise this works.

If you want to loop until you get proper input rather than raise an error, try this:

value = input("Input: ")
while not value.isdigit():
    input("Input must be numeric, please reenter: ")