how to verify a numbre 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: is int python

isinstance(n, int) # n = 9, Returns True / n = 5.5, Returns False