Maybe you all could collaborate on a PEP? This sounds a worthy topic. On Sun, Sep 12, 2021 at 08:37 Serhiy Storchaka <storch...@gmail.com> wrote:
> 12.09.21 17:28, Guido van Rossum пише: > > This is cool. > > > > AFAIK pytest does something like this. How does your implementation > differ? > > What pytest does is awesome. I though about implementing it in the > standard compiler since seen it the first time. > > > What is your argument for making this part of the language? Why not a > > 3rd party library? > > It needs a support in the compiler. The condition expression should be > compiled to keep all immediate results of subexpressions on the stack. > If the final result is true, immediate results are dropped. If it is > false, the second argument of assert is evaluated and its value together > with all immediate results of the first expression, together with > references to corresponding subexpressions (as strings, ranges or AST > nodes) are passed to the special handler. That handler can be > implemented in a third-party library, because formatting and outputting > a report is a complex task. The default handler can just raise an > AttributeError. > > > What about asserts that are not used for testing, but as classic “unless > > there’s a bug, this should hold”? Those may not want to incur the extra > > cost. > > The only extra cost is that immediate results are temporary save on > stack instead of just be dropped. It increases the size of bytecode and > stack, but I don't think it will be significant. > > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/S673FXNSAWR3UWKNLIYTBVDAWONDPWWJ/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido (mobile)
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