In this article we have a given Matrix, extract rows which are of even lengths.
Input : test_list = [[“gfg”, “is”, “best”], [“best”, “good”, “geek”], [“is”, “better”], [“for”, “cs”]]
Output : [[‘best’, ‘good’, ‘geek’], [‘is’, ‘better’]]
Explanation : All strings are of even length.
Input : test_list = [[“gfg”, “is”, “best”], [“best”, “good”, “geeks”], [“is”, “better”], [“for”, “cs”]]
Output : [[‘is’, ‘better’]]
Explanation : All strings are of even length.
Method #1 : Using all() + list comprehension + len()
In this, we check for all the strings in each row, its length, and check if length is even, if all strings in row have even length, then its added to result list.
Python3
# Python3 code to demonstrate working of # Extract rows with Even length strings# Using all() + list comprehension + len() # initializing listtest_list = [["gfg", "is", "best"], ["best", "good", "geek"], ["is", "better"], ["for", "cs"]] # printing original listprint("The original list is : " + str(test_list)) # checking for all elements in rowres = [row for row in test_list if all(len(ele) % 2 == 0 for ele in row)] # printing result print("Rows with even length : " + str(res)) |
The original list is : [[‘gfg’, ‘is’, ‘best’], [‘best’, ‘good’, ‘geek’], [‘is’, ‘better’], [‘for’, ‘cs’]]
Rows with even length : [[‘best’, ‘good’, ‘geek’], [‘is’, ‘better’]]
Method #2 : Using filter() + lambda + len()
In this, we perform task of filtering using filter() + lambda, len() as in above method, performs the task of getting length of each string.
Python3
# Python3 code to demonstrate working of # Extract rows with Even length strings# Using filter() + lambda + len() # initializing listtest_list = [["gfg", "is", "best"], ["best", "good", "geek"], ["is", "better"], ["for", "cs"]] # printing original listprint("The original list is : " + str(test_list)) # checking for all elements in row# filtering done using filter() and lambda res = list(filter(lambda row : all(len(ele) % 2 == 0 for ele in row), test_list)) # printing result print("Rows with even length : " + str(res)) |
The original list is : [[‘gfg’, ‘is’, ‘best’], [‘best’, ‘good’, ‘geek’], [‘is’, ‘better’], [‘for’, ‘cs’]]
Rows with even length : [[‘best’, ‘good’, ‘geek’], [‘is’, ‘better’]]
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