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Python | Replace backword in string

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Method # 1: Using split () + join ()
This is one way we can accomplish this task. In this, we break the elements apart and then return the last value and add a new element using join ().

# Python3 code to demonstrate how it works
# Replace the trailing word in the line
# using split () + join ()

 
# initialization string

test_str = " GFG is good "

  
# print original line

print ( "The original string is:" + test_str)

  
# initialize string replacement

rep_str = "best"

 
# Replace the backword in the line
# using split () + join ()

res =   "" . join (test_str.split ( ’’ ) [: - 1 ] + [rep_str ])

 
# print result

print ( "The String after performing replace:" + res)

Output:

 The original string is: GFG is good The String after performing replace: GFG is best 

Method # 2: Using rfind () + join ()
A combination of these functions can also be used to accomplish this task. In this we perform the task of extracting the last word of a string using rfind () and join () is used to perform the replacement.

# Python3 code to demonstrate how it works
# Replace the backword in the line
# using rfind () + join ()

 
# initialization string

test_str = " GFG is good "

  
# print original line

print ( "The original string is:" + test_str)

  
# initialize string replacement

rep_str = "best"

 
# Replace the backword in the line
# using rfind () + join ()

res = test_str [: test_str.rfind ( ’ ’ )] + ’ ’ + rep_str

 
# print result

print ( "The String after performing replace:" + res)

 

Output:

 The original string is: GFG is good The String after replace: GFG is best performing 

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