how to join from 2 strings code example

Example 1: how to concat join 2 strings in python

str1 = “Hello”
str2 = “World”
str1 + str2

Example 2: python join string with common string

def merge(s1, s2):
    i = 0
    while not s2.startswith(s1[i:]):
        i += 1
    return s1[:i] + s2