> > I would like to make the point that chained exceptions might be slightly > annoying when displayed via console output, as you see the inner exception > first and have to scroll up to see the exception you actually have to > handle.
Just coming back to this, Tom it's not quite true. Yes you see the "inner" exception first - meaning the one raised inside the 'except' block. But that is the one you, as a user, have to handle. This is not a concern for me. I checked with a simple program that Python prints them in the same order and format whether or not "raise ... from" is used on the inner. The only change is the message reads "The above exception was the direct cause of the following exception:" which is pretty clear I think. On Sat, 18 Jan 2020 at 15:18, Ram Rachum <r...@rachum.com> wrote: > > > On Sat, Jan 18, 2020 at 5:05 PM Shai Berger <s...@platonix.com> wrote: > >> [snip] > > But as it turns out, `from` puts the >> original exception on the `__cause__` in *addition* to `__context__`: >> >> [snip] >> So that is not a concern. >> > > Awesome! I did not know that. > > > >> > Regarding automatically enforcing this format going forward: I looked >> > at the list of Flake8 rules <https://www.flake8rules.com/> and >> > couldn't find anything about it. >> > >> >> Indeed, I don't think there can be -- it cannot be a style violation to >> run into an error while handling another error... >> > > I think it can be, as it's very rare to have a legitimate exception > without a "raise from" inside an except clause. In almost any context in > which "during handling of..." is correct, the raising is done deeper in the > stack. > > I think it's rare enough that personally, I would have liked to have a > Flake8 / PyLint rule like that enforces it, and allow ignoring it with a > comment. (As much as I hate Lint ignore comments.) > > -- > You received this message because you are subscribed to the Google Groups > "Django developers (Contributions to Django itself)" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to django-developers+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-developers/CANXboVYxb%2BMeOHp%3De4gzqroKWkHzLjeGXy55qJyRLQQVcUPrWg%40mail.gmail.com > <https://groups.google.com/d/msgid/django-developers/CANXboVYxb%2BMeOHp%3De4gzqroKWkHzLjeGXy55qJyRLQQVcUPrWg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- Adam -- You received this message because you are subscribed to the Google Groups "Django developers (Contributions to Django itself)" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-developers+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-developers/CAMyDDM0%2BcpfiqFs3X9Kw9g%3D7444JahSjGBCa%2B2piSm71g_%3D12g%40mail.gmail.com.
