Проверка на палиндром

import string

def isPalindrome(s):
    s=s.lower()
    string.punctuation = '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'
    for p in string.punctuation:
        if p in s:
            s = s.replace(p, '')
    return s == s[::-1]
def check_tests(list):
    i =0
    answ = []
    is_palindrom = ' is palindrom'
    not_palindrom = ' is not palindrom'
    while(i<len(list)):
        str = '{} of example:'.format(i)
        if(isPalindrome(list[i])):
            str = str + is_palindrom
        else:
            str = str + not_palindrom
        answ.append(str)
        i +=1
    return answ