old_contents: """Code for converting notebooks to and from the v2 format.
  
  Authors:
  
  * Brian Granger
  * Jonathan Frederic
  """
  
  #-----------------------------------------------------------------------------
  #  Copyright (C) 2008-2011  The IPython Development Team
  #
  #  Distributed under the terms of the BSD License.  The full license is in
  #  the file COPYING, distributed as part of this software.
  #-----------------------------------------------------------------------------
  
  #-----------------------------------------------------------------------------
  # Imports
  #-----------------------------------------------------------------------------
  
  from .nbbase import (
      new_code_cell, new_text_cell, new_worksheet, new_notebook, new_output
  )
  
  #-----------------------------------------------------------------------------
  # Code
  #-----------------------------------------------------------------------------
  
  def upgrade(nb, from_version=1):
      """Convert a notebook to the v2 format.
  
      Parameters
      ----------
      nb : NotebookNode
          The Python representation of the notebook to convert.
      orig_version : int
          The original version of the notebook to convert.
      """
      if orig_version == 1:
          newnb = new_notebook()
          ws = new_worksheet()
          for cell in nb.cells:
              if cell.cell_type == u'code':
                  newcell = new_code_cell(input=cell.get('code'),prompt_number=cell.get('prompt_number'))
              elif cell.cell_type == u'text':
                  newcell = new_text_cell(u'markdown',source=cell.get('text'))
              ws.cells.append(newcell)
          newnb.worksheets.append(ws)
          return newnb
      else:
          raise ValueError('Cannot convert a notebook from v%s to v2' % orig_version)
  
  
  def downgrade(nb):
      """Convert a v2 notebook to v1.
  
      Parameters
      ----------
      nb : NotebookNode
          The Python representation of the notebook to convert.
      """
      raise Exception("Downgrade from notebook v2 to v1 is not supported.")
  
new_contents: """Code for converting notebooks to and from the v2 format.
  
  Authors:
  
  * Brian Granger
  * Jonathan Frederic
  """
  
  #-----------------------------------------------------------------------------
  #  Copyright (C) 2008-2011  The IPython Development Team
  #
  #  Distributed under the terms of the BSD License.  The full license is in
  #  the file COPYING, distributed as part of this software.
  #-----------------------------------------------------------------------------
  
  #-----------------------------------------------------------------------------
  # Imports
  #-----------------------------------------------------------------------------
  
  from .nbbase import (
      new_code_cell, new_text_cell, new_worksheet, new_notebook, new_output
  )
  
  #-----------------------------------------------------------------------------
  # Code
  #-----------------------------------------------------------------------------
  
  def upgrade(nb, from_version=1):
      """Convert a notebook to the v2 format.
  
      Parameters
      ----------
      nb : NotebookNode
          The Python representation of the notebook to convert.
      from_version : int
          The version of the notebook to convert from.
      """
      if from_version == 1:
          newnb = new_notebook()
          ws = new_worksheet()
          for cell in nb.cells:
              if cell.cell_type == u'code':
                  newcell = new_code_cell(input=cell.get('code'),prompt_number=cell.get('prompt_number'))
              elif cell.cell_type == u'text':
                  newcell = new_text_cell(u'markdown',source=cell.get('text'))
              ws.cells.append(newcell)
          newnb.worksheets.append(ws)
          return newnb
      else:
          raise ValueError('Cannot convert a notebook from v%s to v2' % from_version)
  
  
  def downgrade(nb):
      """Convert a v2 notebook to v1.
  
      Parameters
      ----------
      nb : NotebookNode
          The Python representation of the notebook to convert.
      """
      raise Exception("Downgrade from notebook v2 to v1 is not supported.")
  
subject: fix typo in v2 convert