_reloader.py 文件源码

def run(self):
        mtimes = {}
        while 1:
            for filename in chain(_iter_module_files(),
                                  self.extra_files):
                try:
                    mtime = os.stat(filename).st_mtime
                except OSError:
                    continue

                old_time = mtimes.get(filename)
                if old_time is None:
                    mtimes[filename] = mtime
                    continue
                elif mtime > old_time:
                    self.trigger_reload(filename)
            self._sleep(self.interval)