> On 16 May 2019, at 08:50, Serhiy Storchaka <storch...@gmail.com> wrote: > > 16.05.19 08:46, Anders Hovmöller пише: >> In the general case because of features that until / was introduced was >> unique to functions defined in C. But in the case of the dict constructor >> that's just a weird misfeature. If it did in fact take *args and handled it >> it would be perfectly fine and useful. It would have meant people wouldn't >> have written all those merge() utility functions over the years. And it >> would make dict(a, b) valid syntax instead of the current overly verbose >> dict(**a, **b). >> For / to be a good idea one needs a strong argument for why a function must >> exist that tales a bounded amount of arguments (ie not *args) where calling >> it with the parameters named would be a bad thing. There are certainly cases >> where the names don't add much, like most functions with one argument but >> that is a different thing. > > The dict constructor is just one example. There are around 60 Python > functions in the stdlib which will benefit from adding support of > positional-only arguments. Look at > https://github.com/python/cpython/pull/12620. > > Writing the code that parses args is errorprone and inefficient. > > There are also other rationales of PEP 570.
I've read it. It is unconvincing to me. / Anders _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
