code: def length(cls, dataset):
      from spatialpandas.geometry import MultiPointDtype, Point
  
      col_name = cls.geo_column(dataset.data)
      column = dataset.data[col_name]
      geom_type = cls.geom_type(dataset)
      if (
          not isinstance(column.dtype, MultiPointDtype)
          and geom_type != "Point"
      ):
          return cls.base_interface.length(dataset)
      length = 0
      for geom in column:
          if isinstance(geom, Point):
              length += 1
          else:
              length += len(geom.buffer_values) // 2
      return length
  
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 25 for calling the SpatialPandasInterface obj's underlying member method code with example usage: obj.length(cls, dataset) and returns: length, cls