On Tue, Jul 24, 2018, 5:50 AM Steven D'Aprano <st...@pearwood.info> wrote:
> But what certainly *is* implicity is David Mertz' suggestion for a > magical None-aware proxy: > > x.attribute > > The only way to tell whether that was an ordinary attribute lookup or a > none-aware lookup would be to carefully inspect x and find out whether it > was an instance of the None-aware proxy class or not. > Every use I've suggested for the magic proxy is similar to: NullCoalesce(cfg).user.profile.food Yes, the class is magic. That much more so in the library I published last night that utilizes wrapt.ObjectProxy. But it's also pretty explicit in that an actual *word* announces that funny stuff is going to happen on the same line. Of course the this could be abused with: cfg = NoneCoalesce(cfg) ... 1000 lines ... do_something(cfg) But then, I could also write a property that actually started a computation of the millionth digit of pi while launching a DDoS attack on python.org when a user accessed 'x.attribute'. NoneCoalesce or GreedyAccess are magic, but in their intended use, they are as little magical as possible to deal with messy nested data.
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