On Apr 16, 2020, at 12:26, Andrew Barnert <abarn...@yahoo.com> wrote: > > Somewhere I have some code for a set of class decorators that help > implementing mappings and sequences: you provide basic __fooitem__ methods, > and it wraps them with methods that do all the extra stuff dict, tuple, and > list do. IIRC, the mutable sequence stuff is the only place where it gets > complicated, but there may be others I haven’t remembered. I can dig this up > if you‘re interested. Maybe it’s even worth cleaning up and posting to PyPI, > or even proposing for somewhere in the stdlib (collections or functools?).
Ok, I found it, and it’s in better shape than I thought it was. (It even passes all the relevant tests from the stdlib test suite.) So I posted it on https://github.com/collectionhelpers in case anyone wants to play with it. If there’s any demand for turning it into a PyPI package, I can do that, but otherwise I won’t bother. Anyway, if you look at the code, most of it is devoted to the mutable sequence __setitem__, but making mapping __getitem__ handle __missing__ wasn’t quite as trivial as you’d expect (it breaks the __contains__ and get methods you inherit from Mapping…). Whether that counts as an argument for or against any version of the various proposals in this thread, I’m not sure. _______________________________________________ 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/PQPYJW2MSBTD3RSOGQNJYSFUOCMYMNGF/ Code of Conduct: http://python.org/psf/codeofconduct/
