write an addition function which perform addition over 2 strings in python code example

Example 1: sum of 2 numbers in python

a = int(input("Enter first number:"))
b = int(input("Enter second number:"))
sum = a+b
print(sum)

Example 2: how to add 2 variables in python

var1 = 5
var2 = 5

result = var1 + var2