code: def __iter__(self):
      for name, content in self.bucket.obj_dict.items():
          if name.startswith(self.prefix):
              yield OSSObjInfo(name, content)
  
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 SideEffectObjIter obj's underlying member method code with example usage: obj.__iter__() without return types