(self, address, strict=True)
Instantiate a new IPv4 network object.

        Args:
            address: A string or integer representing the IP [& network].
              '192.0.2.0/24'
              '192.0.2.0/255.255.255.0'
              '192.0.0.2/0.0.0.255'
              are all functionally the same in IPv4. Similarly,
              '192.0.2.1'
              '192.0.2.1/255.255.255.255'
              '192.0.2.1/32'
              are also functionally equivalent. That is to say, failing to
              provide a subnetmask will create an object with a mask of /32.

              If the mask (portion after the / in the argument) is given in
              dotted quad form, it is treated as a netmask if it starts with a
              non-zero field (e.g. /255.0.0.0 == /8) and as a hostmask if it
              starts with a zero field (e.g. 0.255.255.255 == /8), with the
              single exception of an all-zero mask which is treated as a
              netmask == /0. If no mask is given, a default of /32 is used.

              Additionally, an integer can be passed, so
              IPv4Network('192.0.2.1') == IPv4Network(3221225985)
              or, more generally
              IPv4Interface(int(IPv4Interface('192.0.2.1'))) ==
                IPv4Interface('192.0.2.1')

        Raises:
            AddressValueError: If ipaddress isn't a valid IPv4 address.
            NetmaskValueError: If the netmask isn't valid for
              an IPv4 address.
            ValueError: If strict is True and a network address is not
              supplied.
Instantiate a new IPv4 network object.
Instantiate a new IPv4 network object .
def __init__(self, address, strict=True):

        """Instantiate a new IPv4 network object.

        Args:
            address: A string or integer representing the IP [& network].
              '192.0.2.0/24'
              '192.0.2.0/255.255.255.0'
              '192.0.0.2/0.0.0.255'
              are all functionally the same in IPv4. Similarly,
              '192.0.2.1'
              '192.0.2.1/255.255.255.255'
              '192.0.2.1/32'
              are also functionally equivalent. That is to say, failing to
              provide a subnetmask will create an object with a mask of /32.

              If the mask (portion after the / in the argument) is given in
              dotted quad form, it is treated as a netmask if it starts with a
              non-zero field (e.g. /255.0.0.0 == /8) and as a hostmask if it
              starts with a zero field (e.g. 0.255.255.255 == /8), with the
              single exception of an all-zero mask which is treated as a
              netmask == /0. If no mask is given, a default of /32 is used.

              Additionally, an integer can be passed, so
              IPv4Network('192.0.2.1') == IPv4Network(3221225985)
              or, more generally
              IPv4Interface(int(IPv4Interface('192.0.2.1'))) ==
                IPv4Interface('192.0.2.1')

        Raises:
            AddressValueError: If ipaddress isn't a valid IPv4 address.
            NetmaskValueError: If the netmask isn't valid for
              an IPv4 address.
            ValueError: If strict is True and a network address is not
              supplied.

        """
        _BaseNetwork.__init__(self, address)

        # Constructing from a packed address or integer
        if isinstance(address, (_compat_int_types, bytes)):
            self.network_address = IPv4Address(address)
            self.netmask, self._prefixlen = self._make_netmask(
                self._max_prefixlen)
            # fixme: address/network test here.
            return

        if isinstance(address, tuple):
            if len(address) > 1:
                arg = address[1]
            else:
                # We weren't given an address[1]
                arg = self._max_prefixlen
            self.network_address = IPv4Address(address[0])
            self.netmask, self._prefixlen = self._make_netmask(arg)
            packed = int(self.network_address)
            if packed & int(self.netmask) != packed:
                if strict:
                    raise ValueError('%s has host bits set' % self)
                else:
                    self.network_address = IPv4Address(packed &
                                                       int(self.netmask))
            return

        # Assume input argument to be string or any object representation
        # which converts into a formatted IP prefix string.
        addr = _split_optional_netmask(address)
        self.network_address = IPv4Address(self._ip_int_from_string(addr[0]))

        if len(addr) == 2:
            arg = addr[1]
        else:
            arg = self._max_prefixlen
        self.netmask, self._prefixlen = self._make_netmask(arg)

        if strict:
            if (IPv4Address(int(self.network_address) & int(self.netmask)) !=
                    self.network_address):
                raise ValueError('%s has host bits set' % self)
        self.network_address = IPv4Address(int(self.network_address) &
                                           int(self.netmask))

        if self._prefixlen == (self._max_prefixlen - 1):
            self.hosts = self.__iter__
def __init__ ( self , address , strict = True ) : _BaseNetwork . __init__ ( self , address ) # Constructing from a packed address or integer if isinstance ( address , ( _compat_int_types , bytes ) ) : self . network_address = IPv4Address ( address ) self . netmask , self . _prefixlen = self . _make_netmask ( self . _max_prefixlen ) # fixme: address/network test here. return if isinstance ( address , tuple ) : if len ( address ) > 1 : arg = address [ 1 ] else : # We weren't given an address[1] arg = self . _max_prefixlen self . network_address = IPv4Address ( address [ 0 ] ) self . netmask , self . _prefixlen = self . _make_netmask ( arg ) packed = int ( self . network_address ) if packed & int ( self . netmask ) != packed : if strict : raise ValueError ( '%s has host bits set' % self ) else : self . network_address = IPv4Address ( packed & int ( self . netmask ) ) return # Assume input argument to be string or any object representation # which converts into a formatted IP prefix string. addr = _split_optional_netmask ( address ) self . network_address = IPv4Address ( self . _ip_int_from_string ( addr [ 0 ] ) ) if len ( addr ) == 2 : arg = addr [ 1 ] else : arg = self . _max_prefixlen self . netmask , self . _prefixlen = self . _make_netmask ( arg ) if strict : if ( IPv4Address ( int ( self . network_address ) & int ( self . netmask ) ) != self . network_address ) : raise ValueError ( '%s has host bits set' % self ) self . network_address = IPv4Address ( int ( self . network_address ) & int ( self . netmask ) ) if self . _prefixlen == ( self . _max_prefixlen - 1 ) : self . hosts = self . __iter__