def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def write():
	try:
		p = round(weather.pressure(),2)
		c = light.light()
		print('{"light": '+str(c)+', "pressure": '+str(p)+' }')
	except KeyboardInterrupt:
		pass