old_contents: # PYTHON_ARGCOMPLETE_OK
  """The stagpy module is callable"""
  
  import importlib
  import signal
  import sys
  
  
  def sigint_handler(*_):
      """SIGINT handler"""
      print('\nSo long, and thanks for all the fish.')
      sys.exit()
  
  
  def main():
      """StagPy entry point"""
      signal.signal(signal.SIGINT, sigint_handler)
      config = importlib.import_module('stagpy.config')
      error = importlib.import_module('stagpy.error')
      try:
          args = config.parse_args()
          args.func(args)
      except error.StagpyError as err:
          print('Oops! StagPy encountered the following problem while '
                'processing your request.',
                'Please check the path to your simulation and the command line '
                'arguments.',
                '{}: {}'.format(err.__class__.__name__, err),
                sep='\n')
          sys.exit()
  
  if __name__ == '__main__':
      main()
  
new_contents: # PYTHON_ARGCOMPLETE_OK
  """The stagpy module is callable"""
  
  import importlib
  import signal
  import sys
  
  
  def sigint_handler(*_):
      """SIGINT handler"""
      print('\nSo long, and thanks for all the fish.')
      sys.exit()
  
  
  def main():
      """StagPy entry point"""
      signal.signal(signal.SIGINT, sigint_handler)
      config = importlib.import_module('stagpy.config')
      error = importlib.import_module('stagpy.error')
      try:
          args = config.parse_args()
          args.func(args)
      except error.StagpyError as err:
          print('Oops! StagPy encountered the following problem while '
                'processing your request.',
                'Please check the path to your simulation and the command line '
                'arguments.', '',
                '{}: {}'.format(err.__class__.__name__, err),
                sep='\n')
          sys.exit()
  
  if __name__ == '__main__':
      main()
  
subject: Improve output when __main__ catch a StagpyError