New issue 3087: collections.abc + __init_subclass__ failure
https://bitbucket.org/pypy/pypy/issues/3087/collectionsabc-__init_subclass__-failure
Crusader Ky (crusaderky):
pypy3.6-v7.1.1-linux64
I have a base class that defines \_\_init\_subclass\_\_ and invokes
object.\_\_new\_\_\(cls\) inside it.
If a subclass inherits from it and also from any of the classes from
collections.abc, pypy falls over:
```python
from collections.abc import Hashable
class C:
def __init_subclass__(cls):
object.__new__(cls)
class D(Hashable, C):
def __hash__(self):
return 123
```
Output:
```
Traceback (most recent call last):
File "t1.py", line 9, in <module>
class D(Hashable, C):
File "pypy3.6-v7.1.1-linux64/lib-python/3/abc.py", line 133, in __new__
cls = super().__new__(mcls, name, bases, namespace)
File "t1.py", line 6, in __init_subclass__
object.__new__(cls)
AttributeError: __abstractmethods__
```
Original code, which shows the purpose of this pattern:
[https://github.com/pydata/xarray/blob/4254b4af33843f711459e5242018cd1d678ad3a0/xarray/core/common.py#L186-L208](https://github.com/pydata/xarray/blob/4254b4af33843f711459e5242018cd1d678ad3a0/xarray/core/common.py#L186-L208)
_______________________________________________
pypy-issue mailing list
pypy-issue@python.org
https://mail.python.org/mailman/listinfo/pypy-issue
