code: def compare(left, right, left_label='left', right_label='right',
              drop_close=True, **kwargs):
      
      ret = pd.concat({right_label: right.data.set_index(right._LONG_IDX),
                       left_label: left.data.set_index(left._LONG_IDX)}, axis=1)
      ret.columns = ret.columns.droplevel(1)
      if drop_close:
          ret = ret[~np.isclose(ret[left_label], ret[right_label], **kwargs)]
      return ret[[right_label, left_label]]
docs: Compare the data in two IamDataFrames and return a pd.DataFrame
  
      Parameters
      ----------
      left, right: IamDataFrames
          the IamDataFrames to be compared
      left_label, right_label: str, default `left`, `right`
          column names of the returned dataframe
      drop_close: bool, default True
          remove all data where `left` and `right` are close
      kwargs: passed to `np.isclose()`