def get_download_url(self, proapi=False):
        """
        Get this file's download URL

        :param bool proapi: whether to use pro API

        """
        if self._download_url is None:
            self._download_url = \
                self.api._req_files_download_url(self.pickcode, proapi)
        return self._download_url
dataset/ETHPy150Open shichao-an/115wangpan/u115/api.py/File.get_download_url/original