Python – Test if list is Palindrome
Given a List, check if its palindrome.
Input : test_list = [4, 5, 4]
Output : True
Explanation : List is same from front and rear.Input : test_list = [4, 5, 5]
Output : True
Explanation : List is not same from front and rear.
Method #1: Using list slicing
In this, we extract first and reversed 2nd half of list, and then compare for equality, if found equal, then we conclude its palindrome.
Python3
# Python3 code to demonstrate working of # Test if list is Palindrome# Using list slicing # initializing listtest_list = [1, 4, 5, 4, 1] # printing original listprint("The original list is : " + str(test_list)) # Reversing the listreverse = test_list[::-1] # checking if palindromeres = test_list == reverse # printing result print("Is list Palindrome : " + str(res)) |
The original list is : [1, 4, 5, 4, 1] Is list Palindrome : True
Method #2 : Using reversed()
In this, we simply reverse the list and check if both original list and reversed list is similar.
Python3
# Python3 code to demonstrate working of # Test if list is Palindrome# Using reversed() # initializing listtest_list = [1, 4, 5, 4, 1] # printing original listprint("The original list is : " + str(test_list)) # reversing listrev_list = list(reversed(test_list)) # checking for Palindromeres = rev_list == test_list # printing result print("Is list Palindrome : " + str(res)) |
The original list is : [1, 4, 5, 4, 1] Is list Palindrome : True
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