code: def geo_column(cls, data):
      col = "geometry"
      stypes = cls.series_type()
      if col in data and isinstance(data[col], stypes):
          return col
      cols = [c for c in data.columns if isinstance(data[c], stypes)]
      if not cols:
          raise ValueError(
              "No geometry column found in spatialpandas.GeoDataFrame, "
              "use the PandasInterface instead."
          )
      return cols[0]
  
imports: import sys
  from collections import defaultdict
  import numpy
  import pandas
  from ..dimension import dimension_name
  from ..util import isscalar, unique_array, unique_iterator
  from .interface import DataError, Interface
  from .multipath import MultiInterface, ensure_ring
  from .pandas import PandasInterface
label_desc: Use image node_id 7 for calling the SpatialPandasInterface obj's underlying member method code with example usage: obj.geo_column(cls, data) and returns: cols, col