Jelle Zijlstra <jelle.zijls...@gmail.com> added the comment:
I mean that the code sample above from attrs doesn't properly update the
closure for wrapped methods, such as those created by @functools.cache, or any
other arbitrary decorator that creates a wrapper function.
Example (with Python 3.9.4 and attrs 21.4.0):
% cat attrslots.py
import attr
import functools
class Base:
@classmethod
def f(cls):
return 3
@attr.s(slots=True)
class Child(Base):
x: int
@classmethod
@functools.cache
def f(cls):
return super().f() + 1
print(Child.f())
% python attrslots.py
Traceback (most recent call last):
File "/Users/jelle/py/pyanalyze/samples/attrslots.py", line 21, in <module>
print(Child.f())
File "/Users/jelle/py/pyanalyze/samples/attrslots.py", line 18, in f
return super().f() + 1
TypeError: super(type, obj): obj must be an instance or subtype of type
If we provide a `types.copy_class()`, it should handle this case correctly.
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue47143>
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