Python Language Tutorial => Function to prompt user for a number

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Example

def input_number(msg, err_msg=None):
    while True:
        try:
            return float(raw_input(msg))
        except ValueError:
            if err_msg is not None:
                print(err_msg)


def input_number(msg, err_msg=None):
    while True:
        try:
            return float(input(msg))
        except ValueError:
            if err_msg is not None:
                print(err_msg)

And to use it:

user_number = input_number("input a number: ", "that's not a number!")

Or, if you do not want an "error message":

user_number = input_number("input a number: ")

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Python Language

Python Language Basic Input and Output Function to prompt user for a number

Example

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