hosts_path = "C:\Windows\System32\drivers\etc\hosts"# change hosts path according to your OS
redirect = "127.0.0.1"# localhost's IP
website_list =["www.yahoo.com","www.gmail.com"]
Remove_website =["www.youtube.com","www.facebook.com"]# websites That you want to Unblock

import os

with open(hosts_path, 'r+') as file:
    content = file.read()
    
file.close()
for web in Remove_website:
    if web in content:  
        os.popen('type '+ hosts_path +' | findstr /v '+web).read()
        print "Websites are unblocked succefully"
    else:
        pass
with open(hosts_path, 'w') as file:
    for website in website_list:
        if website in content:
           file.write(redirect + " " + website + "\n") 
        else:
            # mapping hostnames to your localhost IP address
            file.write(redirect + " " + website + "\n")
            print "Websites are blocked succefully"
  
file.close()