Checks your current IP against the last one, and alerts you in Discord if it changes.

ip_check.py

import requests
import os.path

ip_address_file = "./last_ip_address.txt"
discord_webhook_url = "<webhook-url-goes-here>"

# Get current IP address from icanhazip
def get_current_ip() -> str:
    r = requests.get("https://icanhazip.com")
    return r.content.decode().strip()

# Check the locally saved IP address.
def get_last_ip() -> str:
    if not os.path.isfile(ip_address_file):
        write_new_ip()
    return open(ip_address_file, "r").read().strip()

# If the IP returned from the request does not match the IP in the file, alert us in Discord.
def check_ip_and_alert() -> None:
    current_ip = get_current_ip()
    last_ip = get_last_ip()

    if current_ip != last_ip:
        send_data = {
                "username": "Captain Hook",
                "content": f"Lynnwood IP address has changed from {last_ip} to {current_ip}! Update what you need to update!"
        }

        requests.post(discord_webhook_url, json=send_data)

        write_new_ip()

# Write the new IP to the file
def write_new_ip() -> None:
    file = open(ip_address_file, "w")
    file.write(get_current_ip())
    file.close()


# Main
def main() -> None:
    check_ip_and_alert()

if __name__ == "__main__":
    main()