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Python Programs - String

Check if a string is a palindrome - Python Program

Example 1 :

Python 
def is_palindrome(s):
    s = s.replace(" ", "").lower()
    return s == s[::-1]

print(is_palindrome("Madam"))

Output

 
OUTPUT  :
True

Example 2 : Using While Loop (strings)

Python 
string = input("Enter a String : ")
length = len(string)
i = 0
j = length - 1

while i < j:
    if string[i] != string[j]:
        print(string, "is not a palindrome string")
        break
    i += 1
    j -= 1
else:
    print(string, "is a palindrome string")

Output

 
OUTPUT  :
Enter a String : madam
madam is a palindrome string

Example 3 : Using String Slicing

Python 
def is_palindrome(string):
   # Step 1: Convert the string to lower case
   string = str(string).lower()
   
   # Step 2: Reverse the string using slicing
   reversed_str = string[::-1]
   
   # Step 3: Compare the original and reversed strings
   if string == reversed_str:
       return True
   else:
       return False
       
# Input a String

string = input("Enter a String : ")

if is_palindrome(string):
   print(f"{string} is a palindrome number.")
else:
   print(f"{string} is not a palindrome number.")

Output

 
OUTPUT  :
Enter a String : Madam
Madam is a palindrome number

Example 4 : Using Character matching

Python 
def is_palindrome(string):
   # Convert the string to lower case
   string = string.lower()
   
   # Iterate from the start to the middle of the string
   for i in range(len(string) // 2):
       # Compare characters from the start and end
       if string[i] != string[len(string) - 1 - i]:
           # If any characters don't match, it's not a palindrome
           return False
   
   # If all characters match, it's a palindrome
   return True
   
# Input a String
string = input("Enter a String : ")

if is_palindrome(string):
   print(f"{string} is a palindrome number.")
else:
   print(f"{string} is not a palindrome number.")

Output

 
OUTPUT  :
Enter a String : Malayalam
Malayalam is a palindrome number.
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