code: def read(self):
      self._stream.seek(self._byte_range[0])
      if self._byte_range[1] is None:
          return self._stream.read()
      else:
          size = self._byte_range[1] - self._byte_range[0] + 1
          return self._stream.read(size)
  
imports: import time
  from io import BytesIO
  import pytest
  from ....None import dataframe
  from ....tests.core import mock
  from ..None import oss
  from .._oss_lib import glob
  from .._oss_lib.common import OSSFileEntry
  from ..oss import build_oss_path
label_desc: Use image node_id 2 for calling the MockObject obj's underlying member method code with example usage: obj.read() and returns: self, self