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Python | Extract K sized strings

  • Last Updated : 13 Dec, 2021

Sometimes, while working with huge amount of data, we can have a problem in which we need to extract just specific sized strings. This kind of problem can occur during validation cases across many domains. Let’s discuss certain ways to handle this in Python strings list.
Method #1 : Using list comprehension + len() 
The combination of above functionalities can be used to perform this task. In this, we iterate for all the strings and return only K sized strings checked using len().
 

Python3




# Python3 code to demonstrate working of
# Extract K sized strings
# using list comprehension + len()
 
# initialize list
test_list = ['gfg', 'is', 'best', 'for', 'geeks']
 
# printing original list
print("The original list : " + str(test_list))
 
# initialize K
K = 3
 
# Extract K sized strings
# using list comprehension + len()
res = [ele for ele in test_list if len(ele) == K]
 
# printing result
print("The K sized strings are : " + str(res))
Output : 
The original list : ['gfg', 'is', 'best', 'for', 'geeks']
The K sized strings are : ['gfg', 'for']

 

 
Method #2 : Using filter() + lambda 
The combination of above functionalities can be used to perform this task. In this, we extract the elements using filter() and logic is compiled in a lambda function.
 

Python3




# Python3 code to demonstrate working of
# Extract K sized strings
# using filter() + lambda
 
# initialize list
test_list = ['gfg', 'is', 'best', 'for', 'geeks']
 
# printing original list
print("The original list : " + str(test_list))
 
# initialize K
K = 3
 
# Extract K sized strings
# using filter() + lambda
res = list(filter(lambda ele: len(ele) == K, test_list))
 
# printing result
print("The K sized strings are : " + str(res))
Output : 
The original list : ['gfg', 'is', 'best', 'for', 'geeks']
The K sized strings are : ['gfg', 'for']

 


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