class_docstr: Superclass of the embeddable shells supported by igraph
class_docstr_tok: ["Superclass","of","the","embeddable","shells","supported","by","igraph"]
docstr: Returns the progress handler (if exists) or None (if not).
code: def get_progress_handler(self):
      """Returns the progress handler (if exists) or None (if not)."""
      if self.supports_progress_bar():
          return self._progress_handler
      return None
  
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 4 for calling the Shell obj's underlying member method code with example usage: obj.get_progress_handler() and returns: None, self