website blocker python

#Import libraries
import time
from datetime import datetime as dt
#Windows host file path
hostsPath=r"C:\Windows\System32\drivers\etc\hosts"
redirect="127.0.0.1"
#Add the website you want to block, in this list
websites=["www.youtube.com","youtube.com", "www.facebook.com", "facebook.com"]
while True:
   #Duration during which, website blocker will work
   if dt(dt.now().year,dt.now().month,dt.now().day,9) < dt.now() < dt(dt.now().year,dt.now().month,dt.now().day,18):
   print ("Sorry Not Allowed...")
   with open(hostsPath,'r+') as file:
      content = file.read()
      for site in websites:
         if site in content:
            pass
         else:
            file.write(redirect+" "+site+"\n")
   else:
      with open(hostsPath,'r+') as file:
      content = file.readlines()
      file.seek(0)
      for line in content:
         if not any(site in line for site in websites):
            file.write(line)
         file.truncate()
   print ("Allowed access!")
time.sleep(5)