Python | Custom Consecutive Character Pairing

Last Updated : 22 Apr, 2020

Sometimes, while working with Python Strings, we can have problem in which we need to perform the pairing of consecutive strings with deliminator. This can have application in many domains. Lets discuss certain ways in which this task can be performed.

Method #1 : Using join() + list comprehension
The combination of above functions can be used to perform this task. In this, we perform the task of joining the characters using join() and perform the compilation using list comprehension.

# Python3 code to demonstrate working of 
# Custom Consecutive Character Pairing
# Using join() + list comprehension
import string
  
# initializing string
test_str = 'geeksforgeeks'
  
# printing original string
print("The original string is : " + test_str)
  
# initializing Delim
delim = '_'
  
# Custom Consecutive Character Pairing
# Using join() + list comprehension
res = [delim.join(test_str[idx : idx + 2]) for idx in range(len(test_str) - 1)]
  
# printing result 
print("The List of joined Characters : " + str(res)) 

Output :

The original string is : geeksforgeeks
The List of joined Characters : ['g_e', 'e_e', 'e_k', 'k_s', 's_f', 'f_o', 'o_r', 'r_g', 'g_e', 'e_e', 'e_k', 'k_s']

Method #2 : Using windowed() + loop
This is one of the method to solve this problem. In this task of forming pairs is done using windowed(). You need to install more_itertools module externally for its execution.

# Python3 code to demonstrate working of 
# Custom Consecutive Character Pairing
# Using windowed() + loop
import more_itertools
  
# initializing string
test_str = 'geeksforgeeks'
  
# printing original string
print("The original string is : " + test_str)
  
# initializing Delim
delim = '_'
  
# Custom Consecutive Character Pairing
# Using windowed() + loop
res = []
for ele in more_itertools.windowed(test_str, 2):
    res.append(ele[0] + delim + ele[1])
  
# printing result 
print("The List of joined Characters : " + str(res)) 

Output :

The original string is : geeksforgeeks
The List of joined Characters : ['g_e', 'e_e', 'e_k', 'k_s', 's_f', 'f_o', 'o_r', 'r_g', 'g_e', 'e_e', 'e_k', 'k_s']

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