小编dre*_*man的帖子

我正在阅读这篇文章,它展示了这段有趣的代码:

class Car(object):
   def _factory_error_handler(self):
      try:
         yield
      except FactoryColorError, err:
         stacktrace = sys.exc_info()[2]
         raise ValidationError(err.message), None, stacktrace

   def _create_customizer_error_handler(self, vin):
      try:
         yield
      except CustomizerError, err:
         self._factory.remove_car(vin)
         stacktrace = sys.exc_info()[2]
         raise ValidationError(err.message), None, stacktrace

   def _update_customizer_error_handler(self, vin):
      try:
         yield
      except CustomizerError, err:
         stacktrace = sys.exc_info()[2]
         raise ValidationError(err.message), None, stacktrace

   def create(self, color, stereo):
      with self._factory_error_handler():
         vin = self._factory.make_car(color)

      with self._create_customizer_error_handler(vin):
         self._customizer.update_car(vin, stereo)

      return vin

   def update(self, vin, color, stereo):
      with self._factory_error_handler():
         self._factory.update_car_color(vin, color)

      with self._update_customizer_error_handler(vin):
         self._customizer.update_car(vin, stereo)

      return

在这里,他们在一个 …