class_docstr: A simple wrapper around Shapely's STRTree.
  
  
  Parameters
  ----------
  geometry : np.array of Shapely geometries
      Geometries from which to build the spatial index.
class_docstr_tok: ["A","simple","wrapper","around","Shapely","'s","STRTree",".","Parameters","--","--","--","--","--","geometry",":","np.array","of","Shapely","geometries","Geometries","from","which","to","build","the","spatial","index","."]
code: def __len__(self):
      return len(self._tree)
  
file_path: geopandas/geopandas/sindex.py
imports: import warnings
  import numpy
  import shapely
  from shapely.geometry.base import BaseGeometry
  from .None import array, geoseries
  from .None import _compat
label_desc: Use image node_id 10 for calling the SpatialIndex obj's underlying member method code with example usage: obj.__len__() and returns: len