Temperature Level Signifier

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

def compute_bounds(history_data,frame_size,factor):
  if len(history_data)<frame_size :
    return None
  if len(history_data)>frame_size :
    del history_data[0:len(history_data)-frame_size]
  Mn=statistics.mean(history_data)
  Variance=0
  for data in history_data :
    Variance += math.pow((data-Mn),2)
  Zn = factor * math.sqrt(Variance / frame_size)
  High_bound = history_data[frame_size-1]+Zn  
  Low_bound = history_data[frame_size-1]-Zn
  return [High_bound,Low_bound]

minimum_limit = 10
maximum_limit = 50
mybolt = Bolt(email_conf.API_KEY, email_conf.DEVICE_ID)
mailer = Email(email_conf.MAILGUN_API_KEY, email_conf.SANDBOX_URL,
email_conf.SENDER_EMAIL, email_conf.RECIPIENT_EMAIL)

while True:
  print ("Reading sensor value")
  response = mybolt.analogRead('A0')
  data = json.loads(response)
  print ("Sensor value is: " + str(data['value']))
  
  try:
    sensor_value = int(data['value'])
    if sensor_value > limit1 and sensor_value <= limit2:
      print("Temperature is normal")
      response1 = mybolt.digitalWrite('1','HIGH')
      response2 = mybolt.digitalWrite('2','LOW')
      response3 = mybolt.digitalWrite('3','LOW')
      response4 = mybolt.digitalWrite('4','LOW')
     
    elif sensor_value > limit2 and sensor_value <= limit3:
      print("Requesting mailgun to send an email")
      mail_response = mailer.send_email("Attention", "The Current temperature          sensor value has risen to "+str(sensor_value))
      print("Mailgun response is" + response.text)
      response1 = mybolt.digitalWrite('1','HIGH')
      response2 = mybolt.digitalWrite('2','HIGH')
      response3 = mybolt.digitalWrite('3','LOW')
      response4 = mybolt.digitalWrite('4','LOW')

    elif sensor_value > limit3 and sensor_value <= limit4:
      print("Requesting mailgun to send an email")
      mail_response = mailer.send_email("Attention", "The Current temperature          sensor value has risen to "+str(sensor_value))
      print("Mailgun response is" + response.text)
      response1 = mybolt.digitalWrite('1','HIGH')
      response2 = mybolt.digitalWrite('2','HIGH')
      response3 = mybolt.digitalWrite('3','HIGH')
      response4 = mybolt.digitalWrite('4','LOW')
      
    else: 
      print("Requesting mailgun to send an email")
      mail_response = mailer.send_email("Alert", "The Current temperature sensor       value has risen to a very high value of "+str(sensor_value))
      print("Mailgun response is" + response.text)
      response1 = mybolt.digitalWrite('1','HIGH')
      response2 = mybolt.digitalWrite('2','HIGH')
      response3 = mybolt.digitalWrite('3','HIGH')
      response4 = mybolt.digitalWrite('4','HIGH')
 
  except Exception as e:
    print ("Error occured: Below are the details")
    print (e)
    
  if data['success'] != 1:
    print("There was an error while retriving the data.")
    print("This is the error:"+data['value'])
    time.sleep(10)
    continue
    
  print ("This is the value "+data['value'])
  sensor_value=0
  
  try:
    sensor_value = int(data['value'])
  except e:
    print("There was an error while parsing the response: ",e)
    continue
    
  bound = compute_bounds(history_data,conf.FRAME_SIZE,conf.MUL_FACTOR)
  
  if not bound:
    required_data_count=conf.FRAME_SIZE-len(history_data)
    print("Not enough data to compute Z-score. Need ",required_data_count," more     data points")
    history_data.append(int(data['value']))
    time.sleep(10)
    continue
  try:
    if sensor_value > bound[0] :
      print("Requesting mailgun to send an email")
      mail_response = mailer.send_email("Alert", "The Current temperature sensor       value has suddenly risen to "+str(sensor_value))
      print("Mailgun response is" + response.text)
      response1 = mybolt.digitalWrite('1','HIGH')
      response2 = mybolt.digitalWrite('2','HIGH')
      response3 = mybolt.digitalWrite('3','HIGH')
      response4 = mybolt.digitalWrite('4','HIGH')
      
    
    elif sensor_value < bound[1]:
      print("Requesting mailgun to send an email")
      mail_response = mailer.send_email("Alert", "The Current temperature sensor       value has suddenly dropped to "+str(sensor_value))
      print("Mailgun response is" + response.text)
      response1 = mybolt.digitalWrite('1','LOW')
      response2 = mybolt.digitalWrite('2','LOW')
      response3 = mybolt.digitalWrite('3','LOW')
      response4 = mybolt.digitalWrite('4','LOW')
      

  except Exception as e:
    print ("Error",e)
    
  time.sleep(10)