On Wed, Aug 5, 2020 at 2:03 PM Ricky Teachey <ri...@teachey.org> wrote:
>
> And btw this works:
>
> >>> class const(int):
> ... def __new__(cls, name, val):
> ... obj = super().__new__(cls, val)
> ... obj.name = name
> ... return obj
> ... def about(self):
> ... print(self.name, '=', self)
> ...
> >>> a = const('a', 5)
> >>> a
> 5
> >>> a.about()
> a = 5
>
That's literally useless, because after running that there is nothing
stopping you from doing:
>>> a = 10
or even:
>>> a = "python has no constants"
And now a has a value different from 5.
There is nothing even remotely resembling const-ness to that class. In
order to get const-ness, you would need the ability to overload
assignments, like C++ can do. And Python can't do that, and that's probably
a good thing.
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