Guarantees that the user input respects the specified built-in type.

safe_input.py

def input_float(msg):
    while True:
        try:
            return float(input(msg))
        except ValueError:
            print("The input value is not a float.")


def input_int(msg):
    while True:
        try:
            return int(input(msg))
        except ValueError:
            print("The input value is not an integer.")