How does a frozendict help in that example? It's not obvious to me.
Despite not understanding that example, I'm +1 for having a frozendict. I
don't think it'll increase cognitive load much, as it'll sit right next to
frozenset when someone reads the builtins in alphabetical order. In my own
experience, I want to use a dict as a dict key about once or twice a year.
It'd be nice to have a quick way to convert to a frozendict.
On Wed, Oct 10, 2018 at 10:05 AM Philip Martin
Hi, I first want to thank everyone in the community for the contributions over the years. I know the idea of a frozendict has been proposed before and rejected. I have a use case for a frozendict implementation that to my knowledge was not discussed during previous debates. My reasoning for a frozendict class stems from patterns I typically see arise when performing ETL or data integrations and conversions. I generally have used MappingProxyType as a way to set default mapping to a function or to set an empty mapping to a function. I've created a gist with an example use case:
https://gist.github.com/pmart123/493edf84d9aa61691ca7321325ebb6ab
I've included an example of what code typically looks like when using MappingProxyType and what it could look like with a frozendict implementation. I believe this use case may also be under-reported in open source code as it often crops up when integrating third-party data sources, which at times can't be open sourced due to licensing issues. I would love to hear if anyone has used MappingProxyType in a similar manner, or if this use case could help warrant a frozendict in the standard library. _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/