On Tue, Oct 13, 2020 at 6:18 AM Steven D'Aprano <[email protected]> wrote:
> I don't think that a two line class (perhaps a couple of extra
> lines if you give it a docstring) justifies the name "boilerplate":
>
> class MySpecialException(Exception):
> pass
>
I think that in 22 years of using Python, I have never written an exception
that took more than these two lines of code.
Heck, I even have my memory jogged of string exceptions reading this. When
did those go away fully, 1.5.2? 2.1?
I DID in the discussion, immediately think of making an exception a
dataclass, as someone else replied with. I guess if you want cargo in your
exception, that's a pretty good way to do it. But really the ONLY thing I
ever want in an exception is an inheritance tree. An exception feels like
a really unnatural way to pass around data (that said, there are a few
exceptions written by other libraries where some attribute or another is
useful in my except blocks. Perhaps I should consider that, beyond
inspecting the traceback when needed.
If you really want a snazzy highly-parameterized exception, write it
yourself as a class factory. I won't particularly like the antipattern,
but it's available now.
if some_bad_thing:
raise ExceptionMaker("BadStuffErrror", details, plus, more_details)
Implementation of 'ExceptionMaker' left to readers. But it's possible to
write once.
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