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Python | Consecutive element swapping in String

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  • Last Updated : 29 Nov, 2019

Sometimes, while working with strings, we can have a problem in which we may require to perform swapping of consecutive elements in string. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using join() + zip() + generator expression
The combination of above functions can be used to solve this problem. In this, we perform the task of joining consecutive characters using zip() and generator expression is used to provide the swap logic.




# Python3 code to demonstrate working of
# Consecutive element swapping in String
# using join() + zip() + generator expression
  
# initializing string 
test_str = "gfgisbesty"
  
# printing original string 
print("The original string is : " + test_str)
  
# Consecutive element swapping in String
# using join() + zip() + generator expression
res = ''.join([char[1] + char[0] for char in zip(test_str[::2], test_str[1::2])])
  
# printing result
print("String after Consecutive Swapping : " + str(res))

Output :

The original string is : gfgisbesty
String after Consecutive Swapping : fgigbsseyt

 

Method #2 : Using regex expression
This task can also be performed using regular expression using correctly framed regex.




# Python3 code to demonstrate working of
# Consecutive element swapping in String
# using regular expression
import re 
  
# initializing string 
test_str = "gfgisbesty"
  
# printing original string 
print("The original string is : " + test_str)
  
# Consecutive element swapping in String
# using regular expression
res = re.sub(r'(.)(.)', r'\2\1', test_str)
  
# printing result
print("String after Consecutive Swapping : " + str(res))

Output :

The original string is : gfgisbesty
String after Consecutive Swapping : fgigbsseyt

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