On Sun, Oct 24, 2021 at 3:51 PM Brendan Barnwell <brenb...@brenbarn.net> wrote: > > On 2021-10-23 09:07, Chris Angelico wrote: > > Proposal: Proper syntax and support for late-bound argument defaults. > > > > def spaminate(thing, count=:thing.getdefault()): > > ... > > I'm -1 on it. > > For me the biggest problem with this idea is that it only handles a > subset of cases, namely those that can be expressed as an expression > inlined into the function definition. This subset is too small, because > we'll still have to write code in the function body for cases where the > default depends on more complex logic. But it is also too large, > because it will encourage people to cram complex expressions into the > function definition. > ... > Also, insofar as glancing at the function signature is useful, I > suspect that putting this change in will *also* lead to help() being > unhelpful, because, as I mentioned above, if the default uses anything > but the most trivial logic, the signature will become cluttered with > stuff that ought to be separated out as actual logic.
These two considerations, together, are the exact push that programmers need: keep the expression short, don't cram everything into the function definition. It's like writing a list comprehension; technically you can put any expression into the body of it, but it's normally going to be short enough to not get unwieldy. ChrisA _______________________________________________ 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/3WSNUFX4WS27HG75AYRODIKN7N5DIC7C/ Code of Conduct: http://python.org/psf/codeofconduct/
