Python Forum

Can a Palindrome be implemented in Python?

What exactly is your question/goal. Read what Palindrome is.

I don't know what is 'implement' is that case.
You can easily get the palindromes in the first 1000 numbers:

for p in range(1000):
	pa = list(str(p))
	pa.reverse()
	pn = int(''.join(pa))
	if pn == p:
		print(p,pn)

Hi again,
I realize my answer was silly.
Of course, palindromes can be implemented as a python class.
For instance, a very basic sample :

'''The palindrome module is a very basic implementation of palindromes.
Provided as the palindrome.py file'''
class Palindrome():
	'''The Palindrome class provides three public members functions:
		Palindrome(n) : the instanciation member, where n is an integer
		isPalindrome() : this function returns True is the class was instantiated with a palindrome integer
		__str__() : provides a printable form of the palindrome
	'''
	def __init__(self,candidate):
		self.value = candidate
	def isPalindrome(self):
		pa = list(str(self.value))
		pa.reverse()
		pn = int(''.join(pa))
		if pn == self.value:
			return True
		return False
	def __str__(self):
		if self.isPalindrome:
			return '%s is a palindrome' % self.value
		else:
			return '%s is not a palindrome' % self.value

This can be used by the following:

import palindrome
for i in (10,11,12):
	obj = palindrome.Palindrome(i)
	if obj.isPalindrome():
		print(obj)

The result is :
$ python3 pldrm.py
11 is a palindrome

And the docstring is available by:
$python3
Python 3.5.3 (default, Jan 19 2017, 14:11:04)
[GCC 6.3.0 20170118] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import palindrome
>>> help(palindrome)
>>> help(palindrome.Palindrome)
You can invent more complex functions... probably not very useful, but so fun

(Dec-09-2018, 04:16 PM)jeanMichelBain Wrote: [ -> ]Hi again,
I realize my answer was silly.
Of course, palindromes can be implemented as a python class.

I don't think he mean that "implemented" most be a class.
The answer to his question yes,then he should try something himself.

Your answer with reverse() is okay.
When first have started can also bring in [::-1],that's common to use with palindrome.
Eg:

def is_palindrome(n):
    n = str(n)
    return n == n[::-1]

Test:

>>> lst = [10, 11, 12, 99, 24, 44]
>>> filter(is_palindrome, lst)
[11, 99, 44]

Also a newer string formatting than old %s.

return f'{self.value} is a palindrome' 

A palindrome is a phrase, a word, or a sequence that reads the same forward and backward. One such example will be pip! An example of such a phrase will be ‘nurses run’.
>>> def isPalindrome(string):
left,right=0,len(string)-1
while right>=left:
if not string[left]==string[right]:
return False
left+=1;right-=1
return True
>>> isPalindrome('redrum murder')
True

>>> isPalindrome('CC.')
False
Well, there are other ways to do this too. Let’s try using an iterator.

>>> def isPalindrome(string):
left,right=iter(string),iter(string[::-1])
i=0
while i<len(string)/2:
if next(left)!=next(right):
return False
i+=1
return True
>>> isPalindrome('redrum murder')
True

>>> isPalindrome('CC.')
False

>>> isPalindrome('CCC.')
False