[issue25390] Can't define a typing.Union containing a typing.re.Pattern

[Guido van Rossum]

Changes by Guido van Rossum :


--
resolution:  -> fixed
status: open -> closed

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[issue25390] Can't define a typing.Union containing a typing.re.Pattern

[Roundup Robot]

Roundup Robot added the comment:

New changeset 955d3faf727a by Guido van Rossum in branch '3.5':
Issue #25390: typing: Don't crash on Union[str, Pattern].
https://hg.python.org/cpython/rev/955d3faf727a

New changeset 04314479af0b by Guido van Rossum in branch 'default':
Issue #25390: typing: Don't crash on Union[str, Pattern]. (Merge 3.5->3.6)
https://hg.python.org/cpython/rev/04314479af0b

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nosy: +python-dev

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[issue25390] Can't define a typing.Union containing a typing.re.Pattern

[Martí Congost Tapias]

New submission from Martí Congost Tapias:

Defining a union of typing.re.Pattern and anything that isn't AnyStr raises a 
TypeError exception.

Example:

from typing import Union, re

def foo(pattern: Union[str, re.Pattern]) -> None:
pass

Exception traceback:

Traceback (most recent call last):
  File "/tmp/testtyping.py", line 7, in 
def foo(pattern: Union[str, re.Pattern]) -> None:
  File "/usr/local/lib/python3.5/typing.py", line 534, in __getitem__
dict(self.__dict__), parameters, _root=True)
  File "/usr/local/lib/python3.5/typing.py", line 491, in __new__
for t2 in all_params - {t1} if not isinstance(t2, TypeVar)):
  File "/usr/local/lib/python3.5/typing.py", line 491, in 
for t2 in all_params - {t1} if not isinstance(t2, TypeVar)):
TypeError: issubclass() arg 1 must be a class

--
components: Interpreter Core
messages: 252923
nosy: Martí Congost Tapias
priority: normal
severity: normal
status: open
title: Can't define a typing.Union containing a typing.re.Pattern
type: behavior
versions: Python 3.5

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[issue25390] Can't define a typing.Union containing a typing.re.Pattern

[Xiang Zhang]

Changes by Xiang Zhang <18518281...@126.com>:


--
nosy: +xiang.zhang

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[issue25390] Can't define a typing.Union containing a typing.re.Pattern

[Martí Congost Tapias]

Changes by Martí Congost Tapias :


--
components: +Library (Lib) -Interpreter Core

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[issue25390] Can't define a typing.Union containing a typing.re.Pattern

[Guido van Rossum]

Guido van Rossum added the comment:

Confirmed. The failure is because Pattern is _TypeAlias, which is not a type. 
But it should be allowed. I'll think of something. (Does mypy accept this?)

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nosy: +gvanrossum

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[issue25390] Can't define a typing.Union containing a typing.re.Pattern

[Guido van Rossum]

Changes by Guido van Rossum :


--
assignee:  -> gvanrossum

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