Yes, I should have added ternary expressions to if statements. I can definitely see the use there.
However, your example is not null checking. You'd have to modify it slightly to get that: None if var:= function() is None else var.method() Still not bad looking. On Thu, Apr 12, 2018, 11:01 PM Thautwarm Zhao <yaoxiansa...@gmail.com> wrote: > > > You're looking at a very early commit there. I suggest looking at the > > most recent commits on one of two branches: > > > https://github.com/Rosuav/cpython/blob/statement-local-variables/Grammar/Grammar > > https://github.com/Rosuav/cpython/blob/assignment-expressions/Grammar/Grammar > > > Those are the two most recent states in my progress towards (a) > > statement-local name bindings with "EXPR as NAME", and (b) assignment > > expressions with "target := value". > > Okay, and the syntax "target := value" seems to be much easier to handle > with. > > I do support this feature, but now I'm worried about the meaning of ':=', > it seems to be a lazy assignment in some degree. I'm not sure using ':=' is > proper here. > > > > Inasmuch as I might like assignment expressions, it would only be in > while or if statements, personally. > > Not exactly, assignment expression also works for "if expression", we can > now have null checking. > > var.method() if var:= function() else None > > Null checking is importance enough to have a specific syntax in many other > languages(C#, kotlin, Ruby and so on), and we can even have more than null > checking by adding expression assignment. > > > > > _______________________________________________ > 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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