Smart Refrigerator

import conf, json, time, math, statistics
from boltiot import Sms, Bolt, Email

def compute_bounds(history,frame_size,factor):
   if len(history)<frame_size:
       return None
   if len(history)>frame_size:
       del history[0:len(history)-frame_size]

   Mean=statistics.mean(history)
   Variance=0
   
   for data in history:
       Variance += math.pow((data-Mean),2)
   Zn = factor * math.sqrt(Variance/frame_size)

   High_bound = history[frame_size-1]+Zn
   Low_bound = history[frame_size-1]-Zn
   return [High_bound,Low_bound]
  
mybolt = Bolt(conf.API_KEY, conf.DEVICE_ID)
email = Email(conf.MAILGUN_API_KEY, conf.SANDBOX_URL, conf.SENDER_EMAIL, conf.RECIPIENT_EMAIL)
sms = Sms(conf.SSID, conf.AUTH_TOKEN, conf.TO_NUMBER, conf.FROM_NUMBER)
history=[]
  
while True:
   response = mybolt.analogRead('A0')
   data = json.loads(response)
   if data['success'] != 1:
       print("Error retriving data.")
       print(data['value'])
       time.sleep(5)
       continue
   sensor_value1 = int(data['value'])
   sensor_value1 = sensor_value1/10.24
   
   print ("The current recorded temperature: "+ str(sensor_value1)+" degree celsious")
   print("Sensor reading: "+data['value'])
   
   sensor_value=0
   
   try:
       sensor_value = int(data['value'])
   except e:
       print("Error parsing response: ",e)
       continue
   bound = compute_bounds(history,conf.FRAME_SIZE,conf.MUL_FACTOR)
   
   if not bound:
       required_data_count=conf.FRAME_SIZE-len(history)
       print("Insufficient data. "+str(required_data_count)+" more data points needed")
       history.append(int(data['value']))
       time.sleep(5)
       continue
   try:
       if sensor_value>bound[0] :
           sensor_value1 = sensor_value/10.24
           print ("Temparature increased suddenly. Sending email now")
           response = sms.send_sms("Anamoly Detected", "Someone Opened the refrigerator door. The present temperature: " +str(sensor_value1)+ " degree Celsius")
           response = email.send_sms("Anamoly Detected", "Someone Opened the refrigerator door. The present temperature: " +str(sensor_value1)+ " degree Celsius")
       history.append(sensor_value);
   
   except Exception as e:
       print ("Error",e)
  
   time.sleep(5)