pyPalindromeExcludingPunctuation

def is_palindrome(sentence):
    fwd = 0
    bak = len(sentence) - 1
    while fwd < bak:
        a = sentence[fwd]
        if not a.isalpha() and not a.isdigit():
            fwd += 1
            continue
        b = sentence[bak]
        if not b.isalpha() and not b.isdigit():
            bak -= 1
            continue
        if a.lower() != b.lower():
            print(sentence, "is not palindromic")
            break
        fwd += 1
        bak -= 1
    else:               # the loop did NOT end with break
        print(sentence, "is palindromic")

is_palindrome("[email protected]")
# output: [email protected] is palindromic

is_palindrome("[email protected]")
# output: [email protected] is palindromic