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Vaarun Sinha
Vaarun Sinha

Posted on • Edited on

Python Program To Find If A word/number is a palindrome or not.

#python #programming #beginners #tutorial

What Is A Palindrome?

Like every programmer does, let's google it!
😉
googles
A word, phrase, or sequence that reads the same backwards as forwards, e.g madam or nurses run.

Problem

To find if a word/number is a palindrome or not.

Sub Problems

  • Get user input.
  • Check if the input is an integer or string.
  • Reverse the input.
  • Check if the initial input is same as the reversed one.

Pseudo Code 

Input = GetUserInput() reversed_input = reverse(input) if Input is equal to reversed_input: print("It Is A Palindrome Number") else: print("it is not a palindrome number")
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Let's Finally Code It!

  • Get User Input 
userInputw = input("Enter The Value:\n") #w for with whitespace userInput = userInputw.replace(" ", "") #removing whitespace so we can test for phrases like nurses run.
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  • Reverse The Input 
reversedInput = userInput[::-1]
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  • Check If The Initial Input is same as the reversed one. 
 if reversedInput == userInput: print(f"{userInput} is equal to it's reverse {reversedInput} therefore it is a palindrome number.") else: print(f"{userInput} is not equal to it's reverse {reversedInput} therefore it is not a palindrome number.")
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Making the Code Reusable

  • To make the code reusable let's put the logic in a function. 
 def reverse_value(value): reversedValue = value[::-1] return reversedValue def is_palindrome(value): reversedValue = reverse_value(value) if reversedValue == value: return True else: return False
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Full Code 

def reverse_value(value): reversedValue = value[::-1] return reversedValue def is_palindrome(value): reversedValue = reverse_value(value) if reversedValue == value: return True else: return False userInputw = input("Enter The Value:\n") userInput = userInputw.replace(" ", "") isPalindrome = is_palindrome(userInput) if isPalindrome: print(f"{userInputw} is equal to it's reverse {userInputw} therefore it is a palindrome.") else: print(f"{userInput} is not equal to it's reverse {reverse_value(userInput)} therefore it is not a palindrome.")
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Key Takeaways:

  • [::-1] Reverses a string.
  • string.replace(" ", "") replaces all whitespaces with no whitespaces.
  • Before jumping right into code, break the problem Into sub problems then do some pseudo code, then write the code. After That You can optimise it.
  • Implement this if the problem is hard or you cannot exactly think what to code. or else it is a time waster for easy problems.
  • Make The Code Reusable.

Run it on repl

Github: https://github.com/Dev2212/Palindrome-Finder-In-Python

HAPPY CODING!

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Vaarun Sinha • • Edited

Feedback is highly appreciated! This is my first post on dev.to hope you enjoy it and I hope you could learn something new from it.