90. Simple Website Blocker.py

import time
from datetime import datetime as dt

hosts_path = "/etc/hosts"  # For Windows, use "C:\\Windows\\System32\\drivers\\etc\\hosts"
redirect = "127.0.0.1"
website_list = ["www.facebook.com", "facebook.com", "www.youtube.com", "youtube.com"]

def block_websites():
    while True:
        if dt(dt.now().year, dt.now().month, dt.now().day, 8) < dt.now() < dt(dt.now().year, dt.now().month, dt.now().day, 16):
            with open(hosts_path, "r+") as file:
                content = file.read()
                for website in website_list:
                    if website in content:
                        pass
                    else:
                        file.write(redirect + " " + website + "\n")
        else:
            with open(hosts_path, "r+") as file:
                content = file.readlines()
                file.seek(0)
                for line in content:
                    if not any(website in line for website in website_list):
                        file.write(line)
                file.truncate()
        time.sleep(5)

def main():
    block_websites()

if __name__ == "__main__":
    main()