IP4 and IP6 classes for use in SaltStack python state files (without netaddr)

ip.py

class IP4(object):
    """
    >>> print IP4("10.150.42.23") & IP4("255.255.0.0") | IP4("0.0.255.254")
    10.150.255.254"""
    def __init__(self, s="0.0.0.0"):
        s = str(s)
        self.ip = [int(i) for i in s.split(".")]
        assert len(self.ip) == 4
        assert all(0 <= i <= 255 for i in self.ip)

    def __and__(self, other):
        result = self.__class__()
        result.ip = [a & b for a, b in zip(self.ip, other.ip)]
        return result

    def __or__(self, other):
        result = self.__class__()
        result.ip = [a | b for a, b in zip(self.ip, other.ip)]
        return result

    def __str__(self):
        return ".".join("%d" % i for i in self.ip)


class IP6(IP4):
    """
    >>> print IP6("1:fefe::1:455:5:4") & IP6("ffff:ffff:ffff::") | IP6("::1234")
    1:fefe:0:0:0:0:0:1234"""
    def __init__(self, s="::"):
        s = str(s)
        if "::" in s:
            left, right = (i.split(":") if i else [] for i in s.split("::", 1))
            zeros = ["0"] * (8 - len(left + right))
            strings = left + zeros + right
        else:
            strings = s.split(":")
        self.ip = [int(i, 16) for i in strings]
        assert len(self.ip) == 8
        assert all(0 <= i <= 0xffff for i in self.ip)

    def __str__(self):
        return ":".join("%x" % i for i in self.ip)


if __name__ == "__main__":
    import doctest
    doctest.testmod()