On Fri, Dec 3, 2021 at 4:22 AM Nicholas Cole <nicholas.cole@gmail.com> wrote:
There is nothing that this proposal makes possible that is not already possible with more explicit code.
It's worth noting that "explicit" does not mean "verbose". For instance, this is completely explicit about what it does: x += 1 It does not conceal what it's doing, yet it uses a very compact notation to say "augmented addition". The proposal in question uses an explicit symbol to indicate that the default should be late-bound. In contrast, a less explicit and much worse proposal might be: "If the argument default defines a mutable object, construct a new one every time", so "def f(x=1):" would be early bound and "def f(x=[]):" would be late-bound. This is implicit behaviour, since it's not stated in the code which one is which. ChrisA