autoreload.py 文件源码

def restart_reloader():
    while True:
        args = [sys.executable] + sys.argv
        child_environ = os.environ.copy()
        pid = os.fork()

        # child process
        if not pid:
            child_environ["RUN_MAIN"] = "true"
            # may exit with FILE_CHANGED code
            # in fact, call itself
            os.execve(sys.executable, args, child_environ)

        # parent process
        else:
            signal_code = wait_child(pid)
            handle_child_exit(signal_code)


# sample
# from wsgiref.simple_server import make_server
# def run():
#     httpd = make_server(host='', port=8848, app=app)
#     httpd.serve_forever()
# if __name__ == '__main__':
#     autoreload(run)