Ethan Furman <[email protected]> added the comment:
I tried update `abc.py` with the same dance I have to use with `Enum`:
def __new__(mcls, name, bases, namespace, **kwargs):
# remove current __init_subclass__ so previous one can be found with
getattr
try:
new_init_subclass = namespace.get('__init_subclass__')
del namespace['__init_subclass__']
except KeyError:
pass
# create our new ABC type
if bases:
bases = (_NoInitSubclass, ) + bases
abc_cls = super().__new__(mcls, name, bases, namespace, **kwargs)
abc_cls.__bases__ = abc_cls.__bases__[1:]
else:
abc_cls = super().__new__(mcls, name, bases, namespace, **kwargs)
old_init_subclass = getattr(abc_cls, '__init_subclass__', None)
# restore new __init_subclass__ (if there was one)
if new_init_subclass is not None:
abc_cls.__init_subclass__ = classmethod(new_init_subclass)
_abc_init(abc_cls)
# call parents' __init_subclass__
if old_init_subclass is not None:
old_init_subclass(**kwargs)
return abc_cls
But I get this error:
Fatal Python error: init_import_site: Failed to import the site module
Python runtime state: initialized
Traceback (most recent call last):
File "/home/ethan/source/python/cpython/Lib/site.py", line 73, in <module>
import os
File "/home/ethan/source/python/cpython/Lib/os.py", line 29, in <module>
from _collections_abc import _check_methods
File "/home/ethan/source/python/cpython/Lib/_collections_abc.py", line 122,
in <module>
class Coroutine(Awaitable):
File "/home/ethan/source/python/cpython/Lib/abc.py", line 103, in __new__
abc_cls.__bases__ = abc_cls.__bases__[1:]
TypeError: __bases__ assignment: 'Awaitable' object layout differs from
'_NoInitSubclass'
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Python tracker <[email protected]>
<https://bugs.python.org/issue35815>
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