Question

Why doesn't this code returns False when it's not a palindrome?

Answer 1

def toChars(s):
import string
s = string.lower(s)
ans = ''
for c in s:
if c in string.lowercase:
ans = ans + c
return ans

def isPal(s):
if len(s) <= 1:
return True
else:
return s[0] == s[-1] and isPal(s[1:-1])
def isPalindrome(s):
"""Returns True if s is a palindrome and False otherwise"""
return isPal(toChars(s))