[PyQt] Unable to weakreference pyqtBoundSignal

[Kyle Altendorf]

On 2017-09-29 04:58, Phil Thompson wrote:
> On 29 Sep 2017, at 4:22 am, Kyle Altendorf <sda at fstab.net> wrote:
>> 
>> TypeError: cannot create weak reference to 
>> 'PyQt5.QtCore.pyqtBoundSignal' object
>> 
>> Are pyqtBoundSignals intentionally not weak referenceable?  If not, 
>> could it be?
>> 
>> Example and output:
>>    https://gist.github.com/altendky/9f942709dfc2f33019723ffff43260b1
>> 
>> Since I already had it open:
>>    https://docs.python.org/3/extending/newtypes.html#weakref-support
> 
> They aren't because I don't really see the point. Bound signals only
> exist during the period of an emit(), connect() or disconnect().
> Having said that, bound methods are weak referenceable.

My use case was that I am creating functions dynamically to connect as 
slots and
wanted  hold the signal/slot pairs in a WeakKeyDictionary I could later 
use to
disconnect them.  Instead I just apply the same logic to get the same 
signals
again to disconnect.  Using the slot as a weak key just seemed a bit 
more direct.

But perhaps I am misunderstanding something.  You say the the bound 
signal only
exists _during_ an emit/connect/disconnect?  I'm not sure what's going 
on there.
I explored a little but didn't find anything enlightening.  The id() of 
the signal
is the same when accessed repeatedly and 
inspect.is{data,method,member}descriptor()
all return False in my checks.

https://gist.github.com/altendky/7096674b424af3ed8d80e47a41af3169

If you have time to explain a little I would be interested to learn.


> I'll add it to the TODO list - but not high priority.

Thanks for the consideration, since I already 'worked around it' the low 
priority
isn't an issue for me and perhaps an explanation would show an error in 
my
desires anyways.


Cheers,
-kyle