validate integer input python code example

Example 1: how to say that an input needs to be a number python

try:
   val = int(userInput)
except ValueError:
   print("That's not an int!")

Example 2: how to check if a input is an integer 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.")