Python Program to Check if a String is Palindrome or Not - GeeksforGeeks

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Python Program to Check if a String is Palindrome or Not

Last Updated : 28 Oct, 2025

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Given a string, the task is to check whether it is a palindrome. A palindrome is a string that reads the same forward and backward. For example, "madam" is a palindrome, while "hello" is not.
Using Two Pointer Technique
This method compares characters from both ends moving toward the center. It is the most efficient because it checks only half of the string without creating extra copies.
Python s = "malayalam" i, j = 0, len(s) - 1 is_palindrome = True while i < j: if s[i] != s[j]: is_palindrome = False break i += 1 j -= 1 if is_palindrome: print("Yes") else: print("No")

Output
Yes
Explanation:
while loop compares characters from both ends towards the center as long as i < j .
if no mismatch is found, the pointers move inward for the next comparison
After the loop, it prints "Yes" if is_palindrome is True, otherwise "No".
Using all() with Generator Expression
This method checks if all mirrored characters are equal using a generator expression. The string is a palindrome if all comparisons pass.
Python s = "malayalam" if all(s[i] == s[-i-1] for i in range(len(s)//2)): print("Yes") else: print("No")

Output
Yes
Explanation:
range(len(s)//2) generates indices for the first half of the string.
s[-i-1] accesses characters from the end of the string.
s[i] == s[-i-1] checks equality for mirrored positions.
all() returns True only if every comparison is True.
Using Slicing
This method reverses the string using slicing (s[::-1]) and compares it with the original string. If both match, the string is a palindrome.
Python s = "malayalam" if s == s[::-1]: print("Yes") else: print("No")

Output
Yes
Explanation: It compares the string s with its reverse s[::-1]. If they are equal, it prints "Yes" otherwise, it prints "No".
Using reversed() + join()
This method creates a reversed version of the string using reversed() and join(), then compares it with the original string. If they match, it is a palindrome.
Python s = "geeks" rev = ''.join(reversed(s)) if s == rev: print("Yes") else: print("No")

Output
No
Explanation: It creates a reversed version of the string with ''.join(reversed(s)) and compares it with the original string. If they are equal, it prints "Yes" otherwise, it prints "No".

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