class_docstr: For testing. An output class that doesn't render anything.
class_docstr_tok: ["For","testing",".","An","output","class","that","does","n't","render","anything","."]
code: def flush(self):
      pass
  
imports: from __future__ import unicode_literals
  from abc import ABCMeta, abstractmethod
  from six import with_metaclass
  from prompt_toolkit.layout.screen import Size
label_desc: Use image node_id 7 for calling the DummyOutput obj's underlying member method code with example usage: obj.flush() without return types