def parse_color(s):
    """ Parses color string in format #ABC or #AABBCC to RGB tuple. """
    l = len(s)
    assert(l in (4,5,7,9))

    if l in (4,5):
        return tuple(int(ch * 2, 16) for ch in s[1:])
    else:
        return tuple(int(ch1 + ch2, 16) for ch1, ch2 in \
                     zip(
                        (ch1 for ch1 in s[1::2]),
                        (ch2 for ch2 in s[2::2])
                        )
                    )