The answer for Functions - Excercise 1 is

def addition(a,b):
return a + b
print('This code performs additional operation')
var1 = int(input('Enter the first number to add .. '))
var2 = int(input('Enter the second number to add ..'))
ad = addition(var1,var2)
print('The addition of %s and %s is %s' % (var1,var2,ad))