In this article, you will learn how to check whether a string is palindrome or not using python programming language. Enroll for our Python course and learn everything with help of professional instructors.
If you say a string is a palindrome, it means the string has the same meaning even after reversing the string. There are several string palindromes which you can use to check whether their meaning changes after reversing the string or not.
Palindrome Examples:
Madam
Noon
Civic
Malayalam
Racecar
Rotator
Ailihphilia
Level
Wow
Radar, just to name a few
Steps involved to check whether a string is palindrome or not
If you want to check whether a string is a palindrome or not using Python programming language, you just have to follow these four easy steps.
Step 1st: Finding the reverse of the given string using function.
Step 2nd: Calling the function.
Step 3rd: Comparing the reversed string with the original string to check whether they have the same meaning or not.
Step 4th: Printing the result.
Python Program To Check Whether A String Is Palindrome Or Not
| Example 1: # This is a python program to illustrate whether a string # is palindrome or not def reverse(string): return string[::-1] def isPalindrome(string): r = reverse(string) if (string == r): return True return False string = “racecar” result = isPalindrome(string) if result == 1: print(“It is a palindrome”) else: print(“It is not a palindrome”) Output 1: It is a palindrome |
Cleary, the string ‘racecar’ is a palindrome. Now let’s perform this test with another string.
| Example 2: # This is another python program to illustrate whether a string # is palindrome or not def reverse(string): return string[::-1] def isPalindrome(string): r = reverse(string) if (string == r): return True return False string = “palindrome” result = isPalindrome(string) if result == 1: print(“It is a palindrome”) else: print(“It is not a palindrome”) Output 2: It is not a palindrome |
You can also perform this test by using a built-in string function reversed() which returns a reversed object. Before comparing the reversed object with the original string, you need to convert it into a list.
| Example 3: When all the letters of a string are already lowercased # This is a python program to check whether a string # is palindrome or not using built-in # string function reversed() my_string = ‘level’ reversed_string = reversed(my_string) if list(my_string) == list(reversed_string): print(“The given string is a palindrome”) else: print(“The given string is not a palindrome”) Output 3: The given string is a palindrome |
In the above example, all the letters of the given string is already in lowercase. Therefore, the program is successfully executed.
But, if the string has both the uppercase and lowercase letters, you will first need to convert all the letters of the string either into lowercase or uppercase by using lower() and upper() method respectively. Let’s have a look on the below example.
| Example 4: When a string has both uppercase and lowercase letters # This is a python program to check whether a # string(having both uppercase and lowercase letters) # is palindrome or not using built-in # string function reversed() my_string = ‘LeVel’ my_string = my_string.upper() reversed_string = reversed(my_string) if list(my_string) == list(reversed_string): print(“The given string is a palindrome”) else: print(“The given string is not a palindrome”) Output 4: The given string is a palindrome |
We have briefly described how to check whether a given string is palindrome or not with and without using functions by applying different methods in python programming language. Hope you like this article.