def get_next_id(self):
        try:
            query = {'_id': 'last_id'}
            update = {'$inc': {'id': 1}}
            fn = self.db.internal.find_and_modify
            row = fn(query, update, upsert=True, new=True)
        except Exception as e:
            raise DatabaseException(e)
        return row['id']
def test_conflicting_initializers(self):
        class POINT(Structure):
            _fields_ = [("x", c_int), ("y", c_int)]
        # conflicting positional and keyword args
        self.assertRaises(TypeError, POINT, 2, 3, x=4)
        self.assertRaises(TypeError, POINT, 2, 3, y=4)

        # too many initializers
        self.assertRaises(TypeError, POINT, 2, 3, 4)