Python

Python RSS

palindrome

Thread Solved

•

Join Date: Nov 2009

Posts: 4

Reputation: kisan is an unknown quantity at this point

Solved Threads: 0

kisan

Offline

Newbie Poster

palindrome

-1

24 Days Ago

how to check if the string is pallindrome or not in python??

•

Join Date: Nov 2007

Posts: 141

Reputation: mn_kthompson is an unknown quantity at this point

Solved Threads: 32

mn_kthompson mn_kthompson is offline

Offline

Junior Poster

24 Days Ago

There is no built in function that I know of to check that.

On thing you might try doing is reversing the string and then comparing each element.

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
inString = 'racecar'
reversestring = ''
for i in range(0,len(inString)-1:
   reversestring.append(inString[i]
inString = 'racecar'
reversestring = ''
for i in range(0,len(inString)-1:
   reversestring.append(inString[i]

Another way to do it would be to compare the first element to the last element in your string and make sure they match the whole time. One thing that is helpful to remember when doing this is that string[-1] will give you the last element of the string, and string[-2] will give you the second to last. So if your string is racecar then inString[0] should equal inString[-1] and inString[1] should equal inString[-2] etc.

•

Join Date: Jul 2009

Posts: 188

Reputation: masterofpuppets is an unknown quantity at this point

Solved Threads: 47

masterofpuppets masterofpuppets is offline

Offline

Junior Poster

24 Days Ago

there are a couple of posts regarding palindromes in the forum, have a look around.... but basically the algorithm is what mn_kthompson suggested

My site ->> http://8masterofpuppets8.webs.com/
"My belief is stronger than your doubt."

•

Join Date: Nov 2009

Posts: 4

Reputation: kisan is an unknown quantity at this point

Solved Threads: 0

kisan

Offline

Newbie Poster

24 Days Ago

Thank you very much!!
It was helpful. But how could we test if the given string is pallindrome or not. I need a syntax that returns true if the string is pallindrome otherwise false.

•

Join Date: Dec 2007

Posts: 113

Reputation: abhi_elementx is an unknown quantity at this point

Solved Threads: 6

abhi_elementx abhi_elementx is offline

Offline

Junior Poster

24 Days Ago

just compare the inString with reversestring using the == operator

Last edited by abhi_elementx; 24 Days Ago at 6:04 am.

PEACE !

•

Join Date: Aug 2008

Posts: 148

Reputation: snippsat is an unknown quantity at this point

Solved Threads: 46

snippsat

Offline

Junior Poster

24 Days Ago

•

But how could we test if the given string is pallindrome or not. I need a syntax that returns true if the string is pallindrome otherwise false.

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
>>> def is_palindrome(s): 
...     return s.lower() == s[::-1].lower()
... 
>>> is_palindrome('test')
False
>>> is_palindrome('racecar')
True
>>> is_palindrome('RACECAR')
True
>>> def is_palindrome(s): 
...     return s.lower() == s[::-1].lower()
... 
>>> is_palindrome('test')
False
>>> is_palindrome('racecar')
True
>>> is_palindrome('RACECAR')
True

•

Join Date: Dec 2007

Posts: 113

Reputation: abhi_elementx is an unknown quantity at this point

Solved Threads: 6

abhi_elementx abhi_elementx is offline

Offline

Junior Poster

24 Days Ago

bravo!!! snipsat.
Dint know something like this exists in Python.

PEACE !

•

Join Date: Jul 2009

Posts: 188

Reputation: masterofpuppets is an unknown quantity at this point

Solved Threads: 47

masterofpuppets masterofpuppets is offline

Offline

Junior Poster

24 Days Ago

or you could do it using a loop:

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
def isPalindrome( s ):
    s = s.lower()
    for i in range( len ( s ) / 2 ):
        if s[ i ] != s[ -1 -i ]:
            return False
    return True
 
>>> isPalindrome( "RACECAr" )
True
>>> isPalindrome( "test" )
False
>>> isPalindrome( "civiC" )
True
>>> isPalindrome( "ciniC" )
True
>>> isPalindrome( "cinac" )
False
>>>
def isPalindrome( s ):
    s = s.lower()
    for i in range( len ( s ) / 2 ):
        if s[ i ] != s[ -1 -i ]:
            return False
    return True

>>> isPalindrome( "RACECAr" )
True
>>> isPalindrome( "test" )
False
>>> isPalindrome( "civiC" )
True
>>> isPalindrome( "ciniC" )
True
>>> isPalindrome( "cinac" )
False
>>>

Last edited by masterofpuppets; 24 Days Ago at 8:49 am.

My site ->> http://8masterofpuppets8.webs.com/
"My belief is stronger than your doubt."

•

Join Date: Oct 2004

Posts: 4,003

Reputation: vegaseat is just really nice

Solved Threads: 927

vegaseat

Offline

DaniWeb's Hypocrite

24 Days Ago

Let's hope this is not homework and the OP had a chance to learn something.

In a true palindrome test you also need to remove everything but the case adjusted letters.
"Madam in Eden I'm Adam" is a palindrome.

May 'the Google' be with you!

•

Join Date: Nov 2009

Posts: 4

Reputation: kisan is an unknown quantity at this point

Solved Threads: 0

kisan

Offline

Newbie Poster

python more

#10

23 Days Ago

IT was quite helpful. so in case of palindromes how can we remove the symbols and capital letters using .upper and replace function?? for example
"Madam, in Eden I'm Adam!"