old_contents: """Output class.  
  
  Represents a widget that can be used to display output within the widget area.
  """
  
  # Copyright (c) IPython Development Team.
  # Distributed under the terms of the Modified BSD License.
  
  from .widget import DOMWidget
  import sys
  from IPython.utils.traitlets import Unicode, List
  from IPython.display import clear_output
  from IPython.testing.skipdoctest import skip_doctest
  
  @skip_doctest
  class Output(DOMWidget):
      """Widget used as a context manager to display output.
  
      This widget can capture and display stdout, stderr, and rich output.  To use
      it, create an instance of it and display it.  Then use it as a context
      manager.  Any output produced while in it's context will be captured and
      displayed in it instead of the standard output area.
  
      Example
          from IPython.html import widgets
          from IPython.display import display
          out = widgets.Output()
          display(out)
          
          print('prints to output area')
  
          with out:
              print('prints to output widget')"""
      _view_name = Unicode('OutputView', sync=True)
  
      def clear_output(self, *pargs, **kwargs):
          with self:
              clear_output(*pargs, **kwargs)
  
      def __enter__(self):
          """Called upon entering output widget context manager."""
          self._flush()
          kernel = get_ipython().kernel
          session = kernel.session
          send = session.send
          self._original_send = send
          self._session = session
  
          def send_hook(stream, msg_or_type, *args, **kwargs):            
              if stream is kernel.iopub_socket and msg_or_type in ['clear_output', 'stream', 'display_data']:
                  msg = {'type': msg_or_type, 'args': args, 'kwargs': kwargs}
                  self.send(msg)
              else:
                  send(stream, msg_or_type, *args, **kwargs)
                  return
  
          session.send = send_hook
  
      def __exit__(self, exception_type, exception_value, traceback):
          """Called upon exiting output widget context manager."""
          self._flush()
          self._session.send = self._original_send
  
      def _flush(self):
          """Flush stdout and stderr buffers."""
          sys.stdout.flush()
          sys.stderr.flush()
  
new_contents: """Output class.  
  
  Represents a widget that can be used to display output within the widget area.
  """
  
  # Copyright (c) IPython Development Team.
  # Distributed under the terms of the Modified BSD License.
  
  from .widget import DOMWidget
  import sys
  from IPython.utils.traitlets import Unicode, List
  from IPython.display import clear_output
  from IPython.testing.skipdoctest import skip_doctest
  
  @skip_doctest
  class Output(DOMWidget):
      """Widget used as a context manager to display output.
  
      This widget can capture and display stdout, stderr, and rich output.  To use
      it, create an instance of it and display it.  Then use it as a context
      manager.  Any output produced while in it's context will be captured and
      displayed in it instead of the standard output area.
  
      Example
          from IPython.html import widgets
          from IPython.display import display
          out = widgets.Output()
          display(out)
          
          print('prints to output area')
  
          with out:
              print('prints to output widget')"""
      _view_name = Unicode('OutputView', sync=True)
  
      def clear_output(self, *pargs, **kwargs):
          with self:
              clear_output(*pargs, **kwargs)
  
      def __enter__(self):
          """Called upon entering output widget context manager."""
          self._flush()
          kernel = get_ipython().kernel
          session = kernel.session
          send = session.send
          self._original_send = send
          self._session = session
  
          def send_hook(stream, msg_or_type, *args, **kwargs):            
              if stream is kernel.iopub_socket and msg_or_type in ['clear_output', 'stream', 'display_data']:
                  msg = {'type': msg_or_type, 'args': args, 'kwargs': kwargs}
                  self.send(msg)
              else:
                  send(stream, msg_or_type, *args, **kwargs)
  
          session.send = send_hook
  
      def __exit__(self, exception_type, exception_value, traceback):
          """Called upon exiting output widget context manager."""
          self._flush()
          self._session.send = self._original_send
  
      def _flush(self):
          """Flush stdout and stderr buffers."""
          sys.stdout.flush()
          sys.stderr.flush()
  
subject: Remove superfluous return