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")

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.

Reverse The Input

reversedInput = userInput[::-1]

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.")

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

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.")

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.