core.py 文件源码

def hash(self, key):
        """Compute portable hash for `key`.

        :param key: key to hash
        :return: hash value

        """
        mask = 0xFFFFFFFF
        disk_key, _ = self.put(key)
        type_disk_key = type(disk_key)

        if type_disk_key is sqlite3.Binary:
            return zlib.adler32(disk_key) & mask
        elif type_disk_key is TextType:
            return zlib.adler32(disk_key.encode('utf-8')) & mask  # pylint: disable=no-member
        elif type_disk_key in INT_TYPES:
            return disk_key % mask
        else:
            assert type_disk_key is float
            return zlib.adler32(struct.pack('!d', disk_key)) & mask