code: def load(self, val, **kwargs):
          
          if Table and isinstance(val, Table):
              return self.load_table(val, **kwargs)
          elif DataFrame and isinstance(val, DataFrame):
              return self.load_dframe(val, **kwargs)
          else:
              raise Exception("Type %s not a DataFrame or Table." % type(val))
docs: Load the file contents into the supplied pandas dataframe or
          HoloViews Table. This allows a selection to be made over the
          metadata before loading the file contents (may be slow).