pkg_resources.py 文件源码

def _is_current(self, file_path, zip_path):
        """
        Return True if the file_path is current for this zip_path
        """
        timestamp, size = self._get_date_and_size(self.zipinfo[zip_path])
        if not os.path.isfile(file_path):
            return False
        stat = os.stat(file_path)
        if stat.st_size!=size or stat.st_mtime!=timestamp:
            return False
        # check that the contents match
        zip_contents = self.loader.get_data(zip_path)
        f = open(file_path, 'rb')
        file_contents = f.read()
        f.close()
        return zip_contents == file_contents