Raspberry Pi Tornado Temperature Server

gistfile1.py

#!/usr/bin/python
import tornado.ioloop
import tornado.web

MIN_TEMP = 0
ERROR_TEMP = -999.99

TEMP_SENSORS = {
  "28-00043a4518ff" : {"label":"A","location":"Server-1-Front","temperature":None},
  "28-00043b61b4ff" : {"label":"B","location":"Server-1-Back","temperature":None},
  "28-00043e827cff" : {"label":"C","location":"Server-2-Front","temperature":None},
  "28-00043a52a1ff" : {"label":"D","location":"Server-2-Back","temperature":None},
  "28-00043b6803ff" : {"label":"E","location":"Server Room Ambient","temperature":None},
}

def read_temperature(sensor):
        tfile = open("/sys/bus/w1/devices/{0}/w1_slave".format(sensor))
        text = tfile.read()
        tfile.close()
        lines = text.split("\n")
        if lines[0].find("YES") > 0:
                temp = float((lines[1].split(" ")[9])[2:])
                temp /= 1000
                return temp
        return ERROR_TEMP

class MainHandler(tornado.web.RequestHandler):
        def get(self):
                self.write("Hello, world")

class TempHandler(tornado.web.RequestHandler):
        def get(self):
                temps = {}
                for rrd in TEMP_SENSORS:
                        #temp = read_temperature(TEMP_SENSORS[rrd])
                        TEMP_SENSORS[rrd]['temperature'] = read_temperature(rrd)
                response = { 'controller':{'location': 'Server Room','hardware':'raspberrypib+'},
                     'sensors': TEMP_SENSORS,}
                self.write(response)
                
application = tornado.web.Application([
        (r"/", MainHandler),
        (r"/temperatures", TempHandler),
])

if __name__ == "__main__":
        application.listen(8888)
        tornado.ioloop.IOLoop.instance().start()