Automatic Light Intensity Changer

import conf1 , json, time,math,statistics   #importing various python libraries
from boltiot import Bolt
import requests

def compute_bounds(history_data,frame_size,factor):#Function to determine Z-score
	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]
	
def send_telegram_message(message):#Function for Telegram message alert
	url="https://api.telegram.org/"+ conf1.TELEGRAM_BOT_ID +"/sendMessage"
	data={"chat_id":conf1.TELEGRAM_CHAT_ID,"text": message}

	try:
		response = requests.request(
		    "POST",
		    url,
		    params=data
   		)
		print("Telegram response:")
		print(response.text)
		telegram_data=json.loads(response.text)
		return telegram_data["ok"]
	except Exception as e:
		print("An error occured in sending message via Telegram")
		print(e)
		return(False)
mybolt=Bolt(conf1.API_KEY,conf1.DEVICE_ID)#To work on our Bolt Iot module
history_data=[]

while True:
	response=mybolt.analogRead('A0')#To Read input from LDR and at pin 'A0'
	data=json.loads(response)
	if data['success']!=1:
		print("There was an error while retriving the data.")
		print("This is the error:"+data['value'])
		time.sleep(5)
		continue

	print("This is the sensor 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

	led_value_calc=int(sensor_value/4)#command for automatic intensity changing of LED based on LDR value 
	if led_value_calc>255:
		led_value_calc=255
	led_value=255-led_value_calc
	response_led=mybolt.analogWrite('0',led_value)#To write the value of LED to output
	print("Current LED value is: "+str(led_value))

	bound = compute_bounds(history_data,conf1.FRAME_SIZE,conf1.MUL_FACTOR)
	if not bound:
		required_data_count=conf1.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(5)
		continue

	try:
		if sensor_value>bound[0]:
			print("The light level increased suddenly. Sending an SMS.")
			response=send_telegram_message("The current LED intensity is "+str(led_value))
			print("This is the response ",response)
		elif sensor_value< bound[1]:
			print("The light level decreased suddenly. Sending an  SMS.")
			response=send_telegram_message("The current LED intensity is "+str(led_value))
			print("This is the response ",response)
		history_data.append(sensor_value);
	except Exception as e:
		print ("Error",e)
	time.sleep(5)