code: def geo_column(cls, data):
      try:
          return data.geometry.name
      except AttributeError:
          if len(data):
              raise ValueError(
                  "No geometry column found in geopandas.DataFrame, "
                  "use the PandasInterface instead."
              ) from None
          return None
  
imports: import sys
  import warnings
  from collections import defaultdict
  import numpy
  import pandas
  from holoviews.core.util import isscalar, unique_iterator, unique_array
  from holoviews.core.data import Dataset, Interface, MultiInterface, PandasAPI
  from holoviews.core.data.interface import DataError
  from holoviews.core.data import PandasInterface
  from holoviews.core.data.spatialpandas import get_value_array
  from holoviews.core.dimension import dimension_name
  from holoviews.element import Path
  from ..util import asarray, geom_to_array, geom_types, geom_length
  from .geom_dict import geom_from_dict
label_desc: Use image node_id 3 for calling the GeoPandasInterface obj's underlying member method code with example usage: obj.geo_column(cls, data) and returns: data, None