Python Palindrome Program With Examples

Do you know what is palindrome? In this Python tutorial, we will understand how to write a Python Program to check if it is a palindrome or not. Also, we are going to cover the below topics.

• Write a Python Palindrome program string
• Write a Python Palindrome program number
• Write a Python Palindrome program using loop
• Write a Python Palindrome program using recursion
• How to write a longest Palindrome Python program
• Python program for palindrome or not
• Write a Python program to check if it is palindrome or not
• How to write a palindrome program in python without using the string function
• Write a palindrome program in python using the reverse function
• Write a Python Program to print palindrome numbers between 1 to 100
• Python Program to find palindrome word
• Write a palindrome program in python using a while loop
• Write a palindrome program in python using if else
• Write a palindrome program in python using slicing
• Write a palindrome program in python using a list

Python palindrome program

• Any number or string that remains unchanged when reversed is known as a palindrome.
• A palindrome is a word or a set of numbers made up of letters that spell the same word when reading both forward and backward. Python Palindrome permits punctuation, symbols, letters, and spaces within the Palindrome words.
• It works by comparing the actual word and the reverse of the word, and if there is an exact match, the matched value is True. Python has three different forms of palindrome methodology: number palindrome, multiple-word palindrome, and single-word palindrome.
• For example, “mom” is the same in forwarding or reverse direction.

Example:

new_val=input(("Enter a string:"))
if(new_val==new_val[::-1]):
   print("String is a palindrome")
else:
  print("String is Not a palindrome")

To check for palindromes, the above program first takes input from the user (using the input function). Next, determine whether the string has been reversed using the slice operation [start:end: step]. The step value of -1 in this case reverses the string and it will check the condition of whether the string is palindrome or not.

Here is the implementation of the following given code.

This is how we can create a Palindrome program in Python.

Read: Python dictionary append with examples

Python Palindrome program string

• Here we will discuss how to use the string input in the case of a palindrome program.
• Every character in a String was iterated in this Python application using a For Loop. Each character is given an str1 value inside the for loop (before). The palindrome string was then checked using a Python if statement.

Example:

new_str = input("Enter the string value: ")
empty_string = ""

for m in new_str:
    empty_string = m + empty_string
print("Reverse Order :  ", empty_string)

if(new_str == empty_string):
   print("It is a Palindrome String")
else:
   print("It is Not a plaindrome string ")

Here is the Screenshot of the following given code

As you can see in the Screenshot we have used the string input value in Palindrome Program.

Read: Check if a list is empty in Python

Python Palindrome program number

• When reversed, a number must remain the same to qualify as a palindrome. It is not a palindrome if the number does not equal the reverse of itself.
• The integer will be converted to a string format and then the string will be reversed using this approach. The final step will involve verifying that the changed number corresponds to the original.
• To convert the integer number to a string we can easily use the str() function. By using string slicing, it will reverse the number.

Example:

new_val=input(("Enter the value:"))
new_reverse = int(str(new_val)[::-1])

if new_val == new_reverse:
  print('It is Not Palindrome')
else:
  print("It is Palindrome")

In the given example we have used the input statement and then used the str() function to convert the integer value to a string. It will check the condition if the number is reversed then it will return it as a palindrome otherwise it will return “it is not a palindrome’.

Here is the implementation of the following given code.

This is how to create a Palindrome Program by using integer numbers in Python.

Read: Python square a number

Python Palindrome program using loop

• Let us create a palindrome program by using for loop in Python.
• If the reverse number is equal to the same number then the element is called a palindrome number. For example 121=121 So, 121 is a palindrome number.
• we will mention integer numbers while declaring the variables. Then it will check the condition if the number is equal to the reverse number by using the if-else statement.

Example:

new_number = input('Enter the number: ')
n=0
for n in range(len(new_number)):
   if new_number[n]!=new_number[-1-n]:
      print(new_number,'It is not a Palindrome')
      break
   else:
      print(new_number,'It is a Palindrome')
      break

You can refer to the below Screenshot

In this example, we have understood how to create a palindrome program by using for loop in Python.

Read: Python print without newline

Python Palindrome program using recursion

• Simple indexing and a user-defined function are used in conjunction with recursion when it is necessary to determine whether or not a text is a palindrome.
• Palindromes are strings or values that have the same characters in each of their respective indexes when read from right to left and left to right.
• The recursion computes the results of the smaller components of the larger problem and then combines these components to get the larger problem’s solution.

Example:

def check_palindrome(n):
    if len(n) < 1:
        return True
    else:
        if n[0] == n[-1]:
            return check_palindrome(n[1:-1])
        else:
            return False
new_variable = input(("Enter a value: "))
if(check_palindrome(new_variable)):
    print("This is a palindrome")
else:
    print("This is not a palindrome")

In the following given code first, we define the function ‘check_palindrome’ and within this parenthesis, we passed the ‘n’ keyword as an argument. Next, we set the condition if the length of the number is greater than 1 then it will satisfy the condition (n[1:-1]).

Here is the execution of the following given code.

This is how to create a palindrome program by using the recursion method.

Read: 11 Python list methods

longest Palindrome Python program

• Let’s say we have the string S. The longest palindromic substring in S must be located. We are assuming that the string S is 1000 characters long. Therefore, “C” is the longest palindromic substring if the string is “California”.

Example:

Let’s take an example and check how to find the longest palindrome string in Python.

Source Code:

class program(object):
   def longestPalindrome(self, t):
      new_val = [[False for m in range(len(t))] for m in range(len(t))]
      for  m in range(len(t)):
         new_val[m][m] = True
      new_maximum_length = 1
      initial = 0
      for z in range(2,len(t)+1):
         for m in range(len(t)-z+1):
            end = m+z
            if z==2:
               if t[m] == t[end-1]:
                  new_val[m][end-1]=True
                  new_maximum_length = z
                  start = m
            else:
               if t[m] == t[end-1] and new_val[m+1][end-2]:
                  new_val[m][end-1]=True
                  new_maximum_length = z
                  initial = m
      return t[initial:initial+new_maximum_length]
result = program()
print(result.longestPalindrome("California"))

Here is the implementation of the following given code

Read: Create an empty array in Python

Python program for palindrome or not

• A palindrome is a word or a set of numbers made up of letters that spell the same word when reading both forward and backward. Python Palindrome permits punctuation, symbols, letters, and even spaces within the Palindrome words.
• It works by comparing the actual word and the reverse of the word, and if there is an exact match, the matched value is True. Python has three different forms of palindrome methodology: number palindrome, multiple-word palindrome, and single-word palindrome.
• First, we will read the number, and then In a temporary variable, store the letter or number. Next, reverse the number and Compare the temporary variable to a letter or integer that has been reversed.
• Print “This string/number is a palindrome” if the two characters or digits are the same. “This string/number is not a palindrome,” if not, print.

Example:

new_number = 231
rev_number = int(str(new_number)[::-1])

if new_number == rev_number:
  print('It is a Palindrome number')
else:
  print("It is Not a Palindrome number")

In the following given code first, we will declare the variable and assign the integer number to it. Next, we will use the str() function and which will convert the integer number into the string and assign the reversed number.

Next, we set the condition that the given number is equal to the reverse number or not. If it is equal then it is a palindrome otherwise it will display it is not a palindrome number.

You can refer to the below Screenshot

This is how we can check whether the program is palindrome or not in Python.

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Python program to check if it is palindrome or not

• Here we will discuss whether the string or number is palindrome or not in Python.
• A group of digits called a palindrome number stays the same when read backward. Additionally, it is reversed that these numbers are symmetrical. Its digits are equal to the original number when they are inverted. For instance, the number 121 is a palindrome.
• The first step is to number in reverse order and the second step we will compare with the number before the operation.

Example:

Let’s take an example and check whether the string is palindrome or not in Python.

Source Code:

def Palindrome(t):
 return t == t[::-1]

t = "USA"
result = Palindrome(t)

if result:
 print("Yes, It is a Palindrome")
else:
 print("No, It is not a Palindrome")

In the following given code first, we define the function ‘Palindrome’ function and within this parenthesis, we assigned the variable ‘t’ and set the reverse condition t[::-1]. Next, we will set the condition of the result as palindrome or not.

You can refer to the below Screenshot.

Read: Python Addition Examples

palindrome program in python without using the string function

• To check the palindrome number in Python, we may also use a function. and the string is referred to as a palindrome if its reverse contains the same string.
• In this example, we are not going to use the string function instead of that we will declare a variable and assign the string in which we want to check whether the string is palindrome or not.
• Next, we will create another variable in which the reversed string will be stored and then we used the for-loop method and set the condition if the original number == reversed number. If it is equal then it is a palindrome otherwise it will return it is not a palindrome.

Example:

b="mom"
c=""
for m in b:
    c=m+c
if c==b:
    print("This word",c,"is palindrome")
else:
    print("It",c,"is not a palindrome")

Here is the execution of the following given code

In this example, we have understood how to check the palindrome number in Python without using the string function.

Read: Python invalid literal for int() with base 10

Palindrome program in python using reverse function

• In this example, we will discuss how to create a palindrome program in Python by using the reverse function.
• To perform this task we are going to use the reversed function and Python has a built-in method called reversed that may be used to acquire a sequence’s iterator in reverse.
• The reversed function is similar to the iter() method but with the reversed order. An object used to iterate over an iterable is called an iterator. The iter method on an iterable allows us to create an iterator object.

Example:

new_string_value = 'NewYork'  
  
# This string is reverse.  
result = reversed(new_string_value)  
  
if list(new_string_value) == list(result):  
   print(" String is PALINDROME !")  
else:  
   print(" String is NOT PALINDROME !")  

Here is the implementation of the following given code

This is how to create a Palindrome Program in Python by using the reverse function.

Read: Python While Loop Example

Python Program to print palindrome numbers between 1 to 100

• Let us discuss how to print the palindrome numbers between 1 to 100 in Python.
• When a number is reversed and the result is the same as the original, it is said to be a palindrome.
• The user can input the upper limit value using this Python program. The program then produces palindrome numbers from 1 to the user-entered integer. To start, we iterated a loop between 1 and the maximum value using the For Loop.

Example:

lower_val = int(input("Enter the Lowest Number : "))
higher_val = int(input("Enter the Highest Number : "))

print("Palindrome Numbers are between 1 and 100")
for new_number in range(lower_val, higher_val + 1):
    new_val = new_number
    original_num = 0

    while(new_val > 0):
        result = new_val % 10
        original_num = (original_num * 10) + result
        new_val = new_val //10

    if(new_number == original_num):
        print("%d " %new_number, end = '  ')

In the following given code first, we used the input function and enter the integer values. Next, we iterate the values from 1 to 100.

Here is the implementation of the following given code.

This is how we can print the palindrome numbers between 1 to 100 in Python.

Read: Python check if the variable is an integer

Python Program to find palindrome word

• When reversed, a number must remain the same to qualify as a palindrome. It is not a palindrome if the number does not equal the reverse of itself.
• The integer will be converted to a string format and then the string will be reversed using this approach. The final step will involve verifying that the changed number corresponds to the original.

Example:

new_val=input(("Enter a word:"))
if(new_val==new_val[::-1]):
   print("Word is a palindrome")
else:
  print("Word is Not a palindrome")

You can refer to the below Screenshot

In this example, we have understood how to display the palindrome word.

Read: Check if a number is a prime Python

palindrome program in python using a while loop

• In this section, we will discuss how we can use the while loop concept to display the palindrome number.
• A code block’s iteration of the while loop in Python runs each time the provided condition, or conditional expression, is true.

Example:

new_num = int(input("Please Enter the number:"))

new_val = 0
i = new_num

while(i > 0):
    Result = i % 10
    new_val  = (new_val  * 10) + Result
    i = i //10
 
print("Reverse number is = %d" %new_val)
if(new_num == new_val):
    print("%d It is a Palindrome number:" %new_num)
else:
    print("%d It is Not a Pallindrome number:" %new_num)

First, we will take an input number from the user and then utilize a while loop to reverse a specified integer. The original and reverse numbers should be compared. The number is a Python palindrome if both numbers exactly matched.

You can refer to the below Screenshot.

As you can see in the Screenshot we have checked whether the number is palindrome or not by using for loop.

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palindrome program in python using if else

• In this section, we will discuss how to check whether it is a palindrome or not by using the if-else condition in Python.
• The reversed string will be located for this procedure, as mentioned before, and then it will be compared to the original string.

Example:

new_str = input("Enter the string value: ")
empty_string = ""

for m in new_str:
    empty_string = m + empty_string
print("Reverse Order :  ", empty_string)

if(new_str == empty_string):
   print("It is a Palindrome String")
else:
   print("It is Not a plaindrome string ")

In this example, we have used the input function and set the condition if(new_str == empty_string): it will check if the string is palindrome or not.

Here is the implementation of the following given code.

This is how we can check whether the number is palindrome or not by using the if-else condition.

Read: How to get filename from a path in Python

Palindrome program in python using slicing

• In this example, we will discuss how to use the slicing method for returning the palindrome number.
• To check for palindromes, the above program first takes input from the user (using the input function). Next, determine whether the string has been reversed using the slice operation [start:end: step].
• The step value of -1 in this case reverses the string and it will check the condition of whether the string is palindrome or not.

Example:

new_str=input("Enter the value:")
if(new_str==new_str[::-1]):
      print("This is a palindrome number")
else:
      print("This is not a palindrome")

Here is the Output of the following given code

Read: Python if else with examples

palindrome program in python using a list

• In this section, we will discuss how to use the list and check whether it is a palindrome or not.
• A method called “check palindrome list” that accepts a string as a parameter is defined. The original string is compared to the inverted string.
• A list is defined outside the method and shown on the console and it is repeated, and the elements are joined together using the “join” technique before being turned into a string and the necessary parameter is passed when calling the method.

Example:

def palindrome(new_val):
   if new_val == new_val[::-1]:
      print("This list is not a palindrome")
   else:
      print("This list is a palindrome")

new_list = [121, 'mom', 11, 'rotator', 77]

new_list = ' '.join([str(i) for i in new_list])
palindrome(new_list) 

Here is the execution of the following given code

Here is the list of some more related Python tutorials.

• Create a tuple in Python
• Python Program for even or odd
• Python Keywords with examples
• Constructor in Python
• Python Anonymous Function

In this article, we have discussed how to create a palindrome program in python, and also we have checked if it is a palindrome or not also we have covered the below topics.

• Write a Python Palindrome program string
• Write a Python Palindrome program number
• Write a Python Palindrome program using loop
• Write a Python Palindrome program using recursion
• How to write a longest Palindrome Python program
• Python program for palindrome or not
• Write a Python program to check if it is palindrome or not
• How to write a palindrome program in python without using the string function
• Write a palindrome program in python using the reverse function
• Write a Python Program to print palindrome numbers between 1 to 100
• Python Program to find palindrome word
• Write a palindrome program in python using a while loop
• Write a palindrome program in python using if else
• Write a palindrome program in python using slicing
• Write a palindrome program in python using a list