Comments (5)
hynek
commented on May 20, 2024
I was wondering when they added it, because I didn't have it on my radar at all, but it looks like 3.10 – if the docs are to be trusted (3.9 doesn't mention descriptors at all).
Does anyone have a clue how much work it would be to integrate this?
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getzze
commented on May 20, 2024
I checked the source code of `dataclasses` and the only mention of descriptors is in this line:
https://github.com/python/cpython/blob/718dbd4cd33a204e12fb747a09b73c4c4ac1b55f/Lib/dataclasses.py#L349
Maybe defining the method `__set_name__` is enough to instantiate the descriptor and make it work.
…On 3 February 2024 08:02:38 GMT+01:00, Hynek Schlawack ***@***.***> wrote:
I was wondering when they added it, because I didn't have it on my radar at all, but it looks like 3.10 – if the docs are to be trusted (3.9 doesn't mention descriptors at all).
Does anyone have a clue how much work it would be to integrate this?
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Tinche
commented on May 20, 2024
I'm in favor of fixing this on philosophical grounds (I'm bothered by dataclasses doing a thing better than us) ;)
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hynek
commented on May 20, 2024
Yes, it's very irritating.
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getzze
commented on May 20, 2024
Maybe it's not too hard to implement, because annotating the descriptor as `ClassVar` is enough to make it work:
```python
# attrs: THIS WORKS
from typing import ClassVar
@define(slots=False)
class InventoryItem3:
quantity_on_hand: ClassVar[IntConversionDescriptor] = IntConversionDescriptor(default=100)
i3 = InventoryItem3()
print(i3.quantity_on_hand) # 100
i3.quantity_on_hand = 2.5
print(i3.quantity_on_hand) # 2
```
…On 4 February 2024 18:04:49 GMT+01:00, Hynek Schlawack ***@***.***> wrote:
Yes, it's very irritating.
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