how to check input is 4 numbers python code example

Example 1: how to know if a input is a interger in python

whatever = input("Pick an integer > ")
    try:
        whatever_as_an_integer = int(whatever)
        print("That was an integer.")

    except ValueError:
        print("That is not an integer.")

Example 2: python check if input is a number

user_input = input("Enter something:")

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

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