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悔不当初啊，怎么没早看到这个Day13的教程呢。

安装watchdog库

要监控目录文件的变化，我们也无需自己手动定时扫描，Python的第三方库watchdog可以利用操作系统的API来监控目录文件的变化，并发送通知。代码：

pip install watchdog

编写看门狗程序

#!/usr/bin/env python3# -*- coding: utf-8 -*-__author__ = 'Michael Liao'import os, sys, time, subprocessfrom watchdog.observers import Observerfrom watchdog.events import FileSystemEventHandlerdef log(s):    print('[Monitor] %s' % s)class MyFileSystemEventHander(FileSystemEventHandler):    def __init__(self, fn):        super(MyFileSystemEventHander, self).__init__()        self.restart = fn    def on_any_event(self, event):        if event.src_path.endswith('.py'):            log('Python source file changed: %s' % event.src_path)            self.restart()command = ['echo', 'ok']process = Nonedef kill_process():    global process    if process:        log('Kill process [%s]...' % process.pid)        process.kill()        process.wait()        log('Process ended with code %s.' % process.returncode)        process = Nonedef start_process():    global process, command    log('Start process %s...' % ' '.join(command))    process = subprocess.Popen(command, stdin=sys.stdin, stdout=sys.stdout, stderr=sys.stderr)def restart_process():    kill_process()    start_process()def start_watch(path, callback):    observer = Observer()    observer.schedule(MyFileSystemEventHander(restart_process), path, recursive=True)    observer.start()    log('Watching directory %s...' % path)    start_process()    try:        while True:            time.sleep(0.5)    except KeyboardInterrupt:        observer.stop()    observer.join()if __name__ == '__main__':    argv = sys.argv[1:]    if not argv:        print('Usage: ./pymonitor your-script.py')        exit(0)    if argv[0] != 'python': #注意这里将python3改为python        argv.insert(0, 'python') #这里也是，否则会报错    command = argv    path = os.path.abspath('.')    start_watch(path, None)

测试展示

参考博客

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