class_docstr: Superclass of the embeddable shells supported by igraph
class_docstr_tok: ["Superclass","of","the","embeddable","shells","supported","by","igraph"]
code: def __call__(self):
      raise NotImplementedError
  
imports: from abc import ABCMeta, abstractmethod
  import re
  import sys
  from igraph import __version__
  from igraph._igraph import set_progress_handler, set_status_handler
  from igraph.configuration import Configuration
label_desc: Use image node_id 1 for calling the Shell obj's underlying member method code with example usage: obj.__call__() without return types