> It might also be worth considering YAML's own dict merge operator, the > "<<" operator, as in https://yaml.org/type/merge.html as this is the > existing Python's shift operator added to dict and will require no > change to the synatx:: > > a = a << b
I really like this suggestion. It captures the asymmetry, since we could have a = a >> b to merge with the other dictionary's keys taking precedence. My instinct is that a = a << b would take b's values when keys collide and a = a >> b would take a's values when keys collide. I'd be very interested to know if this matches most peoples' intuitions. On Sat, 9 Mar 2019 at 18:44, Meitham Jamaa <m...@meitham.com> wrote: > It might also be worth considering YAML's own dict merge operator, the > "<<" operator, as in https://yaml.org/type/merge.html as this is the > existing Python's shift operator added to dict and will require no > change to the synatx:: > > a = a << b > > Meitham > > > On 03/10, Chris Angelico wrote: > > On Sun, Mar 10, 2019 at 3:16 AM Jonathan Fine <jfine2...@gmail.com> > wrote: > > > > > > Anders Hovmöller wrote: > > > > > > > I don't understand what you mean. Can you provide examples that show > the state of the dicts before and after and what the syntax would be the > equivalent of in current python? > > > > > > If a.__radd__ exists, then > > > a += b > > > is equivalent to > > > a = a.__radd__(b) > > > > > > Similarly, if a.__iat_update__ exists then > > > a @update= b > > > would be equivalent to > > > a = a.__iat_update__(b) > > > > > > Here's an implementation > > > def __iat_update__(self, other): > > > self.update(other) > > > return self > > > > > > Thus, 'b' would be unchanged, and 'a' would be the same dictionary as > > > before, but updated with 'b'. > > > > With something this long, how is it better from just writing: > > > > a = a.update_with(b) > > > > ? What's the point of an operator, especially if - by your own > > statement - it will backward-incompatibly change the language grammar > > (in ways that I've yet to understand, since you haven't really been > > clear on that)? > > > > ChrisA > > > > -- > Meitham Jamaa > > http://meitham.com > GPG Fingerprint: 3934D0B2 > _______________________________________________ > 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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