在意图由任意模块（库）导入的模块中抛出自定义错误

Question

我正在构建一个实现任务队列的python库。如果由于某种原因处理任务的线程死亡，并且没有设置重启线程的选项，我需要抛出异常。

这是我应该抛出一个RuntimeException的东西吗？我不想抛出一个自定义的异常，因为他们必须导入，但我不知道如何最好地实现对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，则可以导入它。

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.