adding two string in python

# initializing string  
test_string = "GFG"
  
# initializing add_string 
add_string = " is best"
  
# printing original string  
print("The original string : " + str(test_string)) 
  
# printing original add string  
print("The add string : " + str(add_string)) 
  
# Using += operator 
# adding one string to another  
test_string += add_string