I dislike the symbol '+' to mean "dictionary merging with value updates." I have no objection to, and mildly support, adding '|' with this meaning.
It's not really possible to give "that one example" where + for meeting makes code less clear... In my eyes it would be EVERY such use. Every example presented in this thread or in the PEP feels wrong to me. I know about operator overloading and dunder methods and custom classes. My intuition about '+' from math, other programming languages, and Python, simply does not lead me to expect the proposed meaning. On Thu, Mar 21, 2019, 12:43 PM Steven D'Aprano <st...@pearwood.info> wrote: > I'd like to make a plea to people: > > I get it, there is now significant opposition to using the + symbol for > this proposed operator. At the time I wrote the first draft of the PEP, > there was virtually no opposition to it, and the | operator had very > little support. This has clearly changed. > > At this point I don't think it is productive to keep making subjective > claims that + will be more confusing or surprising. You've made your > point that you don't like it, and the next draft^1 of the PEP will make > that clear. > > But if you have *concrete examples* of code that currently is easy to > understand, but will be harder to understand if we add dict.__add__, > then please do show me! > > For those who oppose the + operator, it will help me if you made it > clear whether it is *just* the + symbol you dislike, and would accept > the | operator instead, or whether you hate the whole operator concept > regardless of how it is spelled. > > And to those who support this PEP, code examples where a dict merge > operator will help are most welcome! > > > > > ^1 Coming Real Soon Now™. > > > -- > Steven > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ >
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