code: def parse(self, json_data):
          
          data = current.read(json_data, 'ipynb')
          json_data.close()
          return data
docs: Parse a notebook .ipynb file.
  
          Parameters
          ----------
          json_data : file
              A file handle for an .ipynb file.
  
          Returns
          -------
          nb : An IPython Notebook data structure.