code: def __iter__(self):
      return self.groupby_obj.__iter__()
  
imports: import sys
  from collections.abc import Iterable
  import cloudpickle
  import numpy
  from pandas.core.groupby import DataFrameGroupBy, SeriesGroupBy
  from ..utils import estimate_pandas_size, pd_release_version, no_default
label_desc: Use image node_id 4 for calling the GroupByWrapper obj's underlying member method code with example usage: obj.__iter__() and returns: self