how to check an input in 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: how to do an if input = python

start_over = 1

question = input("Do you wish to try again? y/n: ")
if question == "y":
    start_over -= 1
else:
    raise SystemExit