python merge strings

df["period"] = df["Year"].astype(str) + df["quarter"]

# 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 

# 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 

print “{0} {1} is {2} years old.” format(fname, lname, age)

my_list = ['a', 'b', 'c', 'd']
my_string = ','.join(my_list)
# Output = 'a,b,c,d'

>>> 'a' + 'b' + 'c'
'abc'

>>> orig_string = 'Hello'
>>> orig_string + ', world'
'Hello, world'
>>> orig_string
'Hello'
>>> full_sentence = orig_string + ', world'
>>> full_sentence
'Hello, world'