Public bug reported:
issubclass(a_type, union_type) has stopped working:
In zesty:
# python3
Python 3.5.2+ (default, Dec 13 2016, 14:16:35)
[GCC 6.2.1 20161212] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import typing
>>> issubclass(str, typing.Optional[str])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.5/typing.py", line 770, in __subclasscheck__
raise TypeError("Unions cannot be used with issubclass().")
TypeError: Unions cannot be used with issubclass().
In yakkety:
$ python3
Python 3.5.2+ (default, Sep 22 2016, 12:18:14)
[GCC 6.2.0 20160927] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import typing
>>> issubclass(str, typing.Optional[str])
True
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: python3.5 3.5.2-9
ProcVersionSignature: Ubuntu 4.8.0-30.32-generic 4.8.6
Uname: Linux 4.8.0-30-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
Date: Thu Dec 15 09:58:29 2016
ProcEnviron:
TERM=screen.xterm-256color
PATH=(custom, no user)
SourcePackage: python3.5
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: python3.5 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug zesty
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https://bugs.launchpad.net/bugs/1650202
Title:
issubclass(a_type, union_type) has stopped working
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