Fix Python – How to check if string input is a number?


Asked By – Trufa

How do I check if a user’s string input is a number (e.g. -1, 0, 1, etc.)?

user_input = input("Enter something:")

if type(user_input) == int:
    print("Is a number")
    print("Not a number")

The above won’t work since input always returns a string.

Now we will see solution for issue: How to check if string input is a number?


Simply try converting it to an int and then bailing out if it doesn’t work.

    val = int(userInput)
except ValueError:
    print("That's not an int!")

See Handling Exceptions in the official tutorial.

This question is answered By – Daniel DiPaolo

This answer is collected from stackoverflow and reviewed by FixPython community admins, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0