autoreload.py 文件源码

def filename_and_mtime(self, module):
        if not hasattr(module, '__file__') or module.__file__ is None:
            return None, None

        if getattr(module, '__name__', None) in ['__mp_main__', '__main__']:
            # we cannot reload(__main__) or reload(__mp_main__)
            return None, None

        filename = module.__file__
        path, ext = os.path.splitext(filename)

        if ext.lower() == '.py':
            py_filename = filename
        else:
            try:
                py_filename = openpy.source_from_cache(filename)
            except ValueError:
                return None, None

        try:
            pymtime = os.stat(py_filename).st_mtime
        except OSError:
            return None, None

        return py_filename, pymtime