text: import IPython.nbformat.current as nbformat
  
  from IPython.nbconvert.writers.base import WriterBase
  
  class NotebookCopyWriter(WriterBase):
  
      def write(self, output, resources, notebook_name=None, **kw):
          with open(notebook_name + '.output.ipynb', 'w') as outfile:
              nbformat.write(resources['notebook_copy'], outfile, u'ipynb')