def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def test_below():
    """Less than y."""
    p = are.not_below(4)
    ps = [p(x) for x in range(1, 6)]
    assert ps == [False, False, False, True, True]