Problem: Write a program in python to check whether a string is a palindrome string or not.


Input:  mom
Output: Palindrome

Input:  Malayalam
Output: Palindrome

Input:  Pencil
Output: Not Palindrome

To check palindrome string in Python, we need to follow the following steps:

  1. Input a string (str).
  2. Reverse the string (rev).
  3. Check if str == rev.
  4. If YES, then the string is palindrome else not.

Before reversing the string we have to be sure that all the letters in the given string are in the same case (lowercase or uppercase) because if not then Mom would result in ‘Not Palindrome’.

Therefore we use the built-in lower() function to first convert the string into the lowercase then reverse it and finally compare it with the original string.

Here is the implementation of the steps in Python:

str = input("Enter a string: ")

#convert string to lowercase
str = str.lower()

#reverse the string
rev = str[::-1]

if rev == str:
    print("Not Palindrome")

Output 1:

Enter a string: mom

Output 2:

Enter a string: pencil                                                                                                        
Not Palindrome

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