Palindrome checker

working.py

# * palindrome checker
# "aba"
# "racecar"
# "a_* b?a"
# "Aba"

from string import ascii_lowercase


def check(s):
    if len(s) <= 1:
        return True

    l = 0
    r = len(s) - 1

    while l < r:
        lchr = s[l].lower()
        while lchr not in ascii_lowercase and l < r:
            l += 1
            lchr = s[l].lower()

        rchr = s[r].lower()
        while rchr not in ascii_lowercase and r > l:
            r -= 1
            rchr = s[r].lower()

        if lchr != rchr:
            return False

        l += 1
        r -= 1

    return True

written.py

# * palindrome checker
# "aba"
# "racecar"
# "a_* b?a"
# "Aba"

def check(s):
    if len(s) <= 1:
        return True
    
    l = 0
    r = len(s) - 1
    
    while l < r:
        lchr = s[l].lower()
        while lchr not in 'a..z' and l < r:
            l += 1
            
        rchr = s[r].lower()
        while rchr not in 'a..z' and r > l:
            r -= 1
            
        if lchr != rchr:
            return False
        
        l += 1
        r -= 1
        
        
    return True