python - 在要由任意模块（库）导入的模块中引发自定义错误

Question

我正在构建一个实现任务队列的 python 库。如果出于某种原因处理任务的线程死亡，并且未设置重新启动线程的选项，我需要抛出异常。

这是我应该扔的东西RuntimeException吗？我不想抛出自定义异常，因为他们必须导入它，但我不确定如何最好地实现向任意调用代码抛出异常。

Answer 1

抛出自定义异常。如果库的用户需要捕获该异常，他们可以导入它。

例如，采取pickle.PicklingError：

>>> import pickle
>>> pickle.dumps(type(None))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python27\lib\pickle.py", line 1374, in dumps
    Pickler(file, protocol).dump(obj)
  File "C:\Python27\lib\pickle.py", line 224, in dump
    self.save(obj)
  File "C:\Python27\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:\Python27\lib\pickle.py", line 748, in save_global
    (obj, module, name))
pickle.PicklingError: Can't pickle <type 'NoneType'>: it's not found as __builtin__.NoneType
>>> try:
...     pickle.dumps(type(None))
... except pickle.PicklingError:
...     print 'Oops.'
...
Oops.