class_docstr: This is the glue between the :class:`~prompt_toolkit.eventloop.base.EventLoop`
  and :class:`~prompt_toolkit.interface.CommandLineInterface`.
  
  :meth:`~prompt_toolkit.eventloop.base.EventLoop.run` takes an
  :class:`.EventLoopCallbacks` instance and operates on that one, driving the
  interface.
code: def feed_key(self, key):
      pass
  
imports: from __future__ import unicode_literals
  from abc import ABCMeta, abstractmethod
  from six import with_metaclass
label_desc: Use image node_id 3 for calling the EventLoopCallbacks obj's underlying member method code with example usage: obj.feed_key(key) without return types