test_streams.py 文件源码

def test_seeking_from_end(self):
        with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
            self.assertEqual(fp.read(100), TEXT[:100])
            seeked_pos = fp.seek(-100, io.SEEK_END)
            self.assertEqual(seeked_pos, len(TEXT) - 100)
            self.assertEqual(fp.read(100), TEXT[-100:])