How to use the ciscoconfparse.local_py.ipaddr._BaseV4 function in ciscoconfparse

# Constructing from a packed address
        if isinstance(address, Bytes):
            try:
                self._ip, = struct.unpack('!I', address)
            except struct.error:
                raise AddressValueError(address)  # Wrong length.
            return

        # Assume input argument to be string or any object representation
        # which converts into a formatted IP string.
        addr_str = str(address)
        self._ip = self._ip_int_from_string(addr_str)


class IPv4Network(_BaseV4, _BaseNet):

    """This class represents and manipulates 32-bit IPv4 networks.

    Attributes: [examples for IPv4Network('1.2.3.4/27')]
        ._ip: 16909060
        .ip: IPv4Address('1.2.3.4')
        .network: IPv4Address('1.2.3.0')
        .hostmask: IPv4Address('0.0.0.31')
        .broadcast: IPv4Address('1.2.3.31')
        .netmask: IPv4Address('255.255.255.224')
        .prefixlen: 27

    """

    def __init__(self, address, strict=False):
        """Instantiate a new IPv4 network object.

"""
        return self in IPv4Network('127.0.0.0/8')

    @property
    def is_link_local(self):
        """Test if the address is reserved for link-local.

        Returns:
            A boolean, True if the address is link-local per RFC 3927.

        """
        return self in IPv4Network('169.254.0.0/16')


class IPv4Address(_BaseV4, _BaseIP):

    """Represent and manipulate single IPv4 Addresses."""

    def __init__(self, address):

        """
        Args:
            address: A string or integer representing the IP
              '192.168.1.1'

              Additionally, an integer can be passed, so
              IPv4Address('192.168.1.1') == IPv4Address(3232235777).
              or, more generally
              IPv4Address(int(IPv4Address('192.168.1.1'))) ==
                IPv4Address('192.168.1.1')

def v4_int_to_packed(address):
    """The binary representation of this address.

    Args:
        address: An integer representation of an IPv4 IP address.

    Returns:
        The binary representation of this address.

    Raises:
        ValueError: If the integer is too large to be an IPv4 IP
          address.
    """
    if address > _BaseV4._ALL_ONES:
        raise ValueError('Address too large for IPv4')
    return Bytes(struct.pack('!I', address))

def _prefix_from_prefix_string(self, prefixlen_str):
        """Turn a prefix length string into an integer.

        Args:
            prefixlen_str: A decimal string containing the prefix length.

        Returns:
            The prefix length as an integer.

        Raises:
            NetmaskValueError: If the input is malformed or out of range.

        """
        try:
            if not _BaseV4._DECIMAL_DIGITS.issuperset(prefixlen_str):
                raise ValueError
            prefixlen = int(prefixlen_str)
        except ValueError:
            raise NetmaskValueError('%s is not a valid prefix length' %
                                    prefixlen_str)
        return self._prefix_from_prefix_int(prefixlen)

"""
        Args:
            address: A string or integer representing the IP
              '192.168.1.1'

              Additionally, an integer can be passed, so
              IPv4Address('192.168.1.1') == IPv4Address(3232235777).
              or, more generally
              IPv4Address(int(IPv4Address('192.168.1.1'))) ==
                IPv4Address('192.168.1.1')

        Raises:
            AddressValueError: If ipaddr isn't a valid IPv4 address.

        """
        _BaseV4.__init__(self, address)

        # Efficient copy constructor.
        if isinstance(address, IPv4Address):
            self._ip = address._ip
            return

        # Efficient constructor from integer.
        if isinstance(address, (int, long)):
            self._ip = address
            if address < 0 or address > self._ALL_ONES:
                raise AddressValueError(address)
            return

        # Constructing from a packed address
        if isinstance(address, Bytes):
            try: