On Thu, Aug 6, 2020 at 11:11 AM Steven D'Aprano <[email protected]> wrote:
> [Dominik Vilsmeier]:
> > > That should be possible by doing `fred = my_property(42)` and defining
> > > `__set_name__` on the `my_property` class.
>
> Just because you define your own dunder method (which you shouldn't do,
> since dunders are reserved for the interpreter's use) doesn't make
> something which is a syntax error stop being a syntax error.
>
This isn't "defining your own dunder". The syntax as described already
works inside a class:
class my_property:
def __init__(self, n):
self.n = n
def __set_name__(self, cls, name):
print("I'm a property %r on class %s" % (name, cls.__name__))
class X:
fred = my_property(42)
I'm a property 'fred' on class X
But AIUI this is implemented by type.__new__, so there's no useful way
to extend this to globals and/or locals.
ChrisA
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