Barry Scott writes: > I can think of ways to implement evaluation-on-reference, but they > all have the effect of making python slower.
Probably. > The simple > > a = b > > will need to slow down so that the object in b can checked to see > if it need evaluating. No, it doesn't. Binding a name is special in many ways, why not this one too? Or "a = a" could be the idiom for "resolve a deferred now", which would require the check for __evaluate_me_now__ as you say. But such simple "a = b" assignments are not so common that they would be a major slowdown. I would think the real problem would be the "oops" of doing "a = b" and evaluating a deferred you don't want to evaluate. But this isn't a completely new problem, it's similar to a = b = [] and expecting a is not b. Now consider a = b + 0. b.__add__ will be invoked in the usual way. Only if b is a deferred will evaluation take place. So I don't really see the rest of Python slowing down much. _______________________________________________ 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/XYCOZYJSNDZTRMMBDNIL4E62SVIYHRBR/ Code of Conduct: http://python.org/psf/codeofconduct/
