returning an error code

[Gribouillis]

now you're having me wonder what i can put in place of pass in your example.

For example

>>> class Exc(RuntimeError):
...     def __init__(self, *args, **kwargs):
...         super().__init__(*args)
...         self.__dict__.update(kwargs)
... 
>>> e = Exc('foo happened', length=25)
>>> 
>>> e
Exc('foo happened',)
>>> e.length
25