How to Check If a String Is a Palindrome in Python: Step-by-Step Guide

🧠 What is a Palindrome?

A palindrome is a word, number, phrase, or sequence that reads the same forward and backward.

🔁 Examples of Palindromes:

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  "madam"

• "level"

• "radar"

• "12321"

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  "racecar"

If you reverse these strings, they will still be the same!

🐍 Python Program to Check for Palindrome

Let’s create a simple Python program that checks whether a given string is a palindrome.

# Program to check if a string is a palindrome

def is_palindrome(string):
    # Step 1: Convert the string to lowercase to ignore case sensitivity
    string = string.lower()

    # Step 2: Remove spaces from the string
    string = string.replace(" ", "")

    # Step 3: Reverse the string
    reversed_string = string[::-1]

    # Step 4: Compare original and reversed strings
    return string == reversed_string

# Example usage
user_input = input("Enter a string to check if it's a palindrome: ")

if is_palindrome(user_input):
    print(f"'{user_input}' is a palindrome!")
else:
    print(f"'{user_input}' is NOT a palindrome.")

🧩 Step-by-Step Explanation

🔹 Step 1: Convert to Lowercase

string = string.lower()

• Palindromes are not case-sensitive.

• So "Madam" should be treated the same as "madam".

🔹 Step 2: Remove Spaces

string = string.replace(" ", "")

• Sometimes users input phrases like "A man a plan a canal Panama".

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  To handle such cases, we remove spaces.

🔹 Step 3: Reverse the String

reversed_string = string[::-1]

• This is Python’s slicing trick.

• string[::-1] means: start from the end and go backwards.

🔹 Step 4: Compare Original and Reversed Strings

return string == reversed_string

• If both strings match, it means the input is a palindrome.

🧪 More Examples

Let’s try some test cases with the function:

print(is_palindrome("Racecar"))       # True
print(is_palindrome("Python"))        # False
print(is_palindrome("A man a plan a canal Panama"))  # True
print(is_palindrome("12321"))         # True

🔄 Bonus: Palindrome Check Without Removing Spaces

If you want to check strictly character-by-character (including spaces), you can skip step 2.

🚀 Why Use Python for This?

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  Simple syntax: Easy to read and write

• Powerful string handling

• Slicing: A cool Python feature that simplifies reversing strings

🧠 Common Questions

❓ Can a sentence be a palindrome?

Yes! If you ignore spaces and case, sentences like "A man a plan a canal Panama" are palindromes.

❓ What about numbers?

Yes! Numbers like 121 or 12321 are also palindromes.

🎯 Conclusion

Palindrome checking is one of the most common exercises in programming interviews and beginner tutorials. In Python, it becomes incredibly easy with string manipulation and slicing.

With just a few lines of code, you can create a program that checks whether a word, phrase, or number is a palindrome.