def __hash__(self):
        """Called for the key object for dictionary operations, and by
        the built-in function hash(). Should return a 32-bit integer
        usable as a hash value for dictionary operations. The only
        required property is that objects which compare equal have the
        same hash value

        >>> IP('10.0.0.0/24').__hash__()
        -167772185
        """

        thehash = int(-1)
        ip = self.ip
        while ip > 0:
            thehash = thehash ^ (ip & 0x7fffffff)
            ip = ip >> 32
        thehash = thehash ^ self._prefixlen
        return int(thehash)
dataset/ETHPy150Open fp7-ofelia/ocf/ofam/src/src/foamext/IPy.py/IPint.__hash__/original