def download(self, chunk_size=<NUM_LIT>):
stream = BytesIO()<EOL>response = self._swimlane.request(<EOL>'<STR_LIT>',<EOL>'<STR_LIT>'.format(self.file_id),<EOL>stream=True<EOL>)<EOL>for chunk in response.iter_content(chunk_size):<EOL><INDENT>stream.write(chunk)<EOL><DEDENT>stream.seek(<NUM_LIT:0>)<EOL>return stream<EOL>
Download attachment

        Args:
            chunk_size (int): Byte-size of chunked download request stream

        Returns:
            BytesIO: Stream ready for reading containing the attachment file contents