Temperature measurement

Temp.py

#!/usr/bin/env python
import os
import time
import datetime
import glob
import MySQLdb
from time import strftime

os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
temp_sensor = '/sys/bus/w1/devices/28-0004441542ff/w1_slave'
 
# Variables for MySQL
db = MySQLdb.connect(host="localhost", user="xxxx",passwd="xxxxxx", db="xxx")
cur = db.cursor()

while True:
	
	n = 0
	t0list = [];
	t1list = [];
	t2list = [];	
	t3list = [];
	
#ambient temp0
	tfile = open("/sys/bus/w1/devices/28-0004420588ff/w1_slave")
	while (n<50):
		text = tfile.read()
		temperature_data = text.split()[-1]
		t0 = float(temperature_data[2:])
		t0 = t0 / 1000
		list.append(t0)
		n = n + 1
#		print t1
	n = 0

#enclosure temp1
	tfile = open("/sys/bus/w1/devices/28-0004431613ff/w1_slave")
	while (n<50):
		text = tfile.read()
		temperature_data = text.split()[-1]
		t1 = float(temperature_data[2:])
		t1 = t1 / 1000
		list.append(t1)
		n = n + 1
#		print t1
	n = 0	

#enclosure temp2
	tfile = open("/sys/bus/w1/devices/28-0004431af9ff/w1_slave")
	while (n<50):
		text = tfile.read()
		temperature_data = text.split()[-1]
		t2 = float(temperature_data[2:])
		t2 = t2 / 1000
		list.append(t2)
		n = n + 1
		
#		print t2
	n = 0	

#enclosure temp3
	tfile = open("/sys/bus/w1/devices/28-000444175dff/w1_slave")
	while (n<50):
		text = tfile.read()
		temperature_data = text.split()[-1]
		t3 = float(temperature_data[2:])
		t3 = t3 / 1000
		list.append(t2)
		n = n + 1
		
#		print t3
	n = 0	

	t0avg = sum(t0list) / float(len(t0list))
	t1avg = sum(t1list) / float(len(t1list))
	t2avg = sum(t0list) / float(len(t2list))
	t3avg = sum(t0list) / float(len(t3list))
	datetime = (time.strftime("%Y-%m-%d ") + time.strftime("%H:%M:%S"))
	
	sql = ("""INSERT INTO temp (time,amb_temp,enc_temp1,enc_temp2,enc_temp3) VALUES (%d,%d,%d,%d,%d)""",(datetime,t0,t1,t2,t3))
	try:
        #print "Writing to database..."
        # Execute the SQL command
		cur.execute(*sql)
        # Commit your changes in the database
		db.commit()
        #print "Write Complete"
 
	except:
        # Rollback in case there is any error
		db.rollback()
        #print "Failed writing to database"
	time.sleep(60)