Python – Consecutive Repetition of Characters
Sometimes, while working with character lists we can have a problem in which we need to perform consecutive repetition of characters. This can have application in many domains. Lets discuss certain ways in which this task can be performed.
Method #1 : Using list comprehension
This is one of the way in which this task can be performed. In this, we perform a brute force way to perform but in a one-liner for by multiplying each character by magnitude.
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# Python3 code to demonstrate working of # Consecutive Repetition of Characters# Using list comprehension # initializing listtest_list = ['g', 'f', 'g', 'i', 's', 'b', 'e', 's', 't'] # printing original listprint("The original list is : " + str(test_list)) # initializing K K = 3 # Consecutive Repetition of Characters# Using list comprehensionres = [sub for ele in test_list for sub in [ele] * K] # printing result print("The list after Consecutive Repetition is : " + str(res)) |
The original list is : [‘g’, ‘f’, ‘g’, ‘i’, ‘s’, ‘b’, ‘e’, ‘s’, ‘t’]
The list after Consecutive Repetition is : [‘g’, ‘g’, ‘g’, ‘f’, ‘f’, ‘f’, ‘g’, ‘g’, ‘g’, ‘i’, ‘i’, ‘i’, ‘s’, ‘s’, ‘s’, ‘b’, ‘b’, ‘b’, ‘e’, ‘e’, ‘e’, ‘s’, ‘s’, ‘s’, ‘t’, ‘t’, ‘t’]
Method #2 : Using chain() + repeat()
The combination of above functions can be used to solve this problem. In this, we perform the task of repeating using repeat() and the result construction using chain().
# Python3 code to demonstrate working of # Consecutive Repetition of Characters# Using chain() + repeat()from itertools import chain, repeat # initializing listtest_list = ['g', 'f', 'g', 'i', 's', 'b', 'e', 's', 't'] # printing original listprint("The original list is : " + str(test_list)) # initializing K K = 3 # Consecutive Repetition of Characters# Using chain() + repeat()res = list(chain.from_iterable(repeat(chr, K) for chr in test_list)) # printing result print("The list after Consecutive Repetition is : " + str(res)) |
The original list is : [‘g’, ‘f’, ‘g’, ‘i’, ‘s’, ‘b’, ‘e’, ‘s’, ‘t’]
The list after Consecutive Repetition is : [‘g’, ‘g’, ‘g’, ‘f’, ‘f’, ‘f’, ‘g’, ‘g’, ‘g’, ‘i’, ‘i’, ‘i’, ‘s’, ‘s’, ‘s’, ‘b’, ‘b’, ‘b’, ‘e’, ‘e’, ‘e’, ‘s’, ‘s’, ‘s’, ‘t’, ‘t’, ‘t’]
