Temperature Monitoring Project using Bolt Wifi Module

import conf
from boltiot import Bolt, Email
import json, time, math, statistics
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]
	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]
mybolt = Bolt(conf.API_KEY,conf.DEVICE_ID)
mailer = Email(conf.MAILGUN_API_KEY,conf.SANDBOX_URL,conf.SENDER_EMAIL,conf.RECIPIENT_EMAIL)
history_data = []

while True:
	response = mybolt.analogRead('A0')
	data = json.loads(response)
	if data['success'] != 1:
		print("There was an error while retriving the data.")
		time.sleep(10)
		continue
	try:
		sensor_value = ((int(data['value']))/(10.24))
	except e:
		print("There was an error while parsing the response: ",e)
		continue
	print("the temperature is ",sensor_value)

	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(sensor_value)
		time.sleep(10)
		continue
	try:
		if sensor_value > bound[0]:
			print("The temperature increased suuddenly.")
			print("Someone opened the fridge door. Sending an Email.")
			response = mailer.send_email("Alert! The temperature increased suddenly. Someone has opened the fridge door.")
			print("Response received:",response)
		if sensor_value < conf.LOW_THRESHOLD or sensor_value > HIGH_THRESHOLD:
			print("The temperature crossed threshold limits. Sending an Email.")
			response = mailer.send_email("Alert!, The temperature crossed threshold limits. The current temperature is:"+str(sensor_value))
			print("Response received: ",response)
		history_data.append(sensor_value)
	except Exception as e:
	    print("Error!",e)
	    time.sleep(10)