how to detect user 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: pythn programme for adding user unputs

# Store input numbers
num1 = input('Enter first number: ')
num2 = input('Enter second number: ')

# Add two numbers
sum = float(num1) + float(num2)

# Display the sum
print('The sum of {0} and {1} is {2}'.format(num1, num2, sum))