class_docstr: List container of DGL.
  
  You do not need to create List explicitly.
  Normally python list and tuple will be converted automatically
  to List during dgl function call.
  You may get List in return values of DGL function call.
class_docstr_tok: ["List","container","of","DGL",".","You","do","not","need","to","create","List","explicitly",".","Normally","python","list","and","tuple","will","be","converted","automatically","to","List","during","dgl","function","call",".","You","may","get","List","in","return","values","of","DGL","function","call","."]
code: def __len__(self):
      return _api_internal._ListSize(self)
  
imports: from __future__ import absolute_import
  from .None import _api_internal
  from ._ffi.object import ObjectBase, register_object
  from ._ffi.object_generic import convert_to_object
label_desc: Use image node_id 2 for calling the List obj's underlying member method code with example usage: obj.__len__() and returns: _api_internal