old_contents: """Python script Exporter class"""
  
  #-----------------------------------------------------------------------------
  # Copyright (c) 2013, the IPython Development Team.
  #
  # Distributed under the terms of the Modified BSD License.
  #
  # The full license is in the file COPYING.txt, distributed with this software.
  #-----------------------------------------------------------------------------
  
  #-----------------------------------------------------------------------------
  # Imports
  #-----------------------------------------------------------------------------
  
  from IPython.utils.traitlets import Unicode
  
  from .templateexporter import TemplateExporter
  
  #-----------------------------------------------------------------------------
  # Classes
  #-----------------------------------------------------------------------------
  
  class PythonExporter(TemplateExporter):
      """
      Exports a Python code file.
      """
      def _file_extension_default(self):
          return 'py'
  
      def _template_file_default(self):
          return 'python'
  
      output_mimetype = 'text/x-python'
  
new_contents: """Python script Exporter class"""
  
  #-----------------------------------------------------------------------------
  # Copyright (c) 2013, the IPython Development Team.
  #
  # Distributed under the terms of the Modified BSD License.
  #
  # The full license is in the file COPYING.txt, distributed with this software.
  #-----------------------------------------------------------------------------
  
  #-----------------------------------------------------------------------------
  # Imports
  #-----------------------------------------------------------------------------
  
  from .templateexporter import TemplateExporter
  
  #-----------------------------------------------------------------------------
  # Classes
  #-----------------------------------------------------------------------------
  
  class PythonExporter(TemplateExporter):
      """
      Exports a Python code file.
      """
      def _file_extension_default(self):
          return 'py'
  
      def _template_file_default(self):
          return 'python'
  
      output_mimetype = 'text/x-python'
  
subject: Drop unused traitlet imports