Newbie with Pi3

[buran]

import RPi.GPIO as GPIO
import time
from datetime import datetime
from twilio.rest import Client

GPIO.setmode(GPIO.BOARD)
GPIO.setwarnings(False)
GPIO.setup(7,GPIO.IN)   #LDR (Light Dependent Resistor)
  
GPIO.setup(11, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) #top switch
GPIO.setup(12, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # bottom switch
  
GPIO.setup(15,GPIO.OUT) # Door Open
GPIO.setup(13,GPIO.OUT) # Door Close
  
  
def send_sms(sms_text="Hello from Python!"):
    twilio_client = Client("ACxxxxxxxxxxxxxx", "zzzzzzzzzzzzz")
    client.messages.create(to="+19732644152", 
                           from_="+12023351278", 
                           body=sms_text)


def operate_door(channel):
    if channel == 7:
        if not GPIO.input(7) and not GPIO.input(11): # it's day and door is not open
            print ("Day. Open door")
            print ("Start motor. Time is {}".format(datetime.now().strftime('%d %b %Y %H:%M:%S.%f')))
            GPIO.output(15, True)
            while True:
                if GPIO.input(11):
                    GPIO.output(15,False)
                    print ("STOP. Door open. Time is {}".format(datetime.now().strftime('%d %b %Y %H:%M:%S.%f')))
                    break
            #send_sms("sms_text='Door opened'")
                
        elif GPIO.input(7) and not GPIO.input(12): # it's night and door is not closed
            print ("Night. Close door")
            print ("Start motor. Time is {}".format(datetime.now().strftime('%d %b %Y %H:%M:%S.%f')))
            GPIO.output(13, True) 
            while True:
                if GPIO.input(12):
                    GPIO.output(13,False)
                    print ("STOP. Door closed. Time is {}".format(datetime.now().strftime('%d %b %Y %H:%M:%S.%f')))
                    break
            #send_sms("sms_text='Door opened'")
           

# add events detection, using separate thread
GPIO.add_event_detect(7, GPIO.BOTH, callback=operate_door, bouncetime=200)
delay = 1 # 1 sec. delay
print('Start monitoring')
while True:
    try:
        #time.sleep(delay) # you may change this or replace it with just pass
        pass #uncomment this if you decide to remove time.sleep above
    except KeyboardInterrupt:
        print('Stop monitoring and quit')

For the testing I also commented out the time.sleep line in order to avoid the 1 s delays while testing