This python example script will help you to find out the entered string is a palindrome or not. The logic is reversing the original string and comparing both the original and reversed string.
Here is the script (palidrome.py):
The code is self explanatory, read the comments in the script.
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print("Enter a word") #get the string mystring = str(input()) #remove space mystring = mystring.replace(" ", "") #remove special characters mystring = ''.join(e for e in mystring if e.isalnum()) #change all characters to lower case mystring = mystring.lower() #reverse the string revstring = mystring[::-1] if(mystring == revstring): print("Palindrome") else: print("Not Palindrome") |
Steps are:
1. Read the string using python function raw_input() and store it in a variable mystring
2. Remove space from using replace() function
3. Remove special characters from the string using isalnum() – this function allows only alphabets
4. Change all characters to lower case
5. Now reverse the string using [::-1] and store it in another variable revstring
6. Finally compare both mystring and revstring by == double equal operator
If both the string matches print “Palindrome” or else print “Not Palindrome”
Some palindrome words and sentences to check this script:
1. madam
2. civic
3. A man, a plan, a canal: Panama.
4. No lemon, no melon.
If you are a Python Web developer you may need this CGI script to run on your server:
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#!/usr/bin/python print "Content-type: text/html\n\n"; # Import modules for CGI handling import cgi, cgitb # Create instance of FieldStorage form = cgi.FieldStorage() mystring = form.getvalue('string') if(mystring): #remove space mystring = mystring.replace(" ", "") #remove special characters mystring = ''.join(e for e in mystring if e.isalnum()) #change all characters to lower case mystring = mystring.lower() #reverse the string revstring = mystring[::-1] if(mystring == revstring): print("Palindrome") else: print("Not Palindrome") print ''' <html> <body> <h3>Web Based Python script to Find a string is Palindrome or Not</h3> <form action="" method="post"> <label>Enter a word or a sentence<label> <input type="text" name="string" /> <input type="submit" value="Submit" /> </form> </body> </html> ''' |
You can also see the Python web script demo here:
Same program is written in PHP and Java, If you want please have a look:
PHP: http://www.tutorialsmade.com/php-program-find-palindrome/
JAVA: http://www.tutorialsmade.com/java-program-string-palindrome/
