def isPalindrome(s, ignorecase=False):

    """
    >>> type(isPalindrome("bob"))
    <type 'bool'>
    >>> isPalindrome("abc")
    False
    >>> isPalindrome("bob")
    True
    >>> isPalindrome("a man a plan a canal, panama")
    True
    >>> isPalindrome("A man a plan a canal, Panama")
    False
    >>> isPalindrome("A man a plan a canal, Panama", ignorecase=True)
    True
    """
    Letters = ""
    for i in s:
        letter = str.isalpha(i);
        if letter == True:
                Letters += i

    reverseLetters = Letters[::-1]
    if ignorecase==False:
        if reverseLetters == Letters:
            return True
        else:
            return False




    # Create an empty string "onlyLetters"
    # Loop over all characters in the string argument, and add each
    #   character which is a letter to "onlyletters"

    # Reverse "onlyletters" and test if this is equal to "onlyletters"
print isPalindrome("kayak, kayak, kayak")