New submission from Christoph Glaubitz <chris...@chrigl.de>:
I'm not sure if this is a bug, or a known breaking change. I didn't find
anything related in the changelog, except for a rewrite of abc. But hovever, I
want this to be documented.
In 3.7.0:
import abc
def f():
pass
class A(metaclass=abc.ABCMeta):
pass
issubclass(f, A)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.7/abc.py", line 143, in __subclasscheck__
return _abc_subclasscheck(cls, subclass)
TypeError: issubclass() arg 1 must be a class
python up to 3.6 (including 2.7) happily return false.
Found real world usage in osc-lib
*
https://github.com/openstack/osc-lib/blob/46e2fb0a58fc06cfce1bb535f432405767d6b78b/osc_lib/utils/__init__.py#L495
* https://storyboard.openstack.org/#!/story/2003322
----------
messages: 325975
nosy: glaubich
priority: normal
severity: normal
status: open
title: Regression in abc in combination with issubclass
type: behavior
versions: Python 3.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34760>
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