how to check input in 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 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

Example 3: 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")

Example 4: python check if input is a number

user_input = input("Enter something:")

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