watch.py

import os
import subprocess
import sys
import time

from watchdog.events import FileSystemEventHandler
from watchdog.observers import Observer


class Watcher:
    DIRECTORY_TO_WATCH = os.path.dirname(os.path.abspath(__file__))

    def __init__(self, script_name):
        self.script_name = script_name
        self.observer = Observer()

    def run(self):
        event_handler = Handler(self.script_name)
        self.observer.schedule(event_handler, self.DIRECTORY_TO_WATCH, recursive=True)
        self.observer.start()
        try:
            while True:
                time.sleep(1)
        except KeyboardInterrupt:
            self.observer.stop()
        self.observer.join()


class Handler(FileSystemEventHandler):
    def __init__(self, script_name):
        self.script_name = script_name
        self.process = subprocess.Popen([sys.executable, self.script_name])

    def on_any_event(self, event):
        if event.event_type == "modified" and event.src_path.endswith(".py"):
            print(f"{event.src_path} changed. Restarting script...")
            self.process.terminate()
            self.process = subprocess.Popen([sys.executable, self.script_name])


if __name__ == "__main__":
    # Replace 'app.py' with the name of your main Python script
    w = Watcher("app.py")
    w.run()