[issue27014] maximum recursion depth when using typing options

[Guido van Rossum]

Guido van Rossum added the comment:

Thanks to Kalle Tuure for the fix!

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resolution:  -> fixed
stage:  -> resolved
status: open -> closed
versions: +Python 3.6

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[issue27014] maximum recursion depth when using typing options

[Roundup Robot]

Roundup Robot added the comment:

New changeset 79197e60e441 by Guido van Rossum in branch '3.5':
Fix #27014 -- infinite recursion using typing.py.
https://hg.python.org/cpython/rev/79197e60e441

New changeset a6c04626205f by Guido van Rossum in branch 'default':
Fix #27014 -- infinite recursion using typing.py. (Merge 3.5 -> 3.6.)
https://hg.python.org/cpython/rev/a6c04626205f

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nosy: +python-dev

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[issue27014] maximum recursion depth when using typing options

[Guido van Rossum]

Guido van Rossum added the comment:

Actually, see https://github.com/python/typing/issues/222 instead.

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[issue27014] maximum recursion depth when using typing options

[Guido van Rossum]

Guido van Rossum added the comment:

See also https://github.com/python/mypy/issues/1546 -- possibly it's the same 
issue.

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[issue27014] maximum recursion depth when using typing options

[Guido van Rossum]

Guido van Rossum added the comment:

Simpler repro:

from collections import UserList
from typing import Sequence
class MyList(UserList, Sequence):
pass
isinstance(None, Sequence)

No progress yet in understanding. :-(

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[issue27014] maximum recursion depth when using typing options

[Guido van Rossum]

Guido van Rossum added the comment:

Ow, that's bad. :-(

Great job reducing this to a  minimal repro!

I'm guessing it's got to do with registration.  I'll try to figure out how to 
fix it; the fix should appear in Python 3.5.2.

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assignee:  -> gvanrossum

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[issue27014] maximum recursion depth when using typing options

[Terry J. Reedy]

Changes by Terry J. Reedy :


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nosy: +gvanrossum

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[issue27014] maximum recursion depth when using typing options

[Roy Shmueli]

New submission from Roy Shmueli:

While creating class of List and using a Optional as part of the typing system. 
I have got an error when I was importing one of my module. I was able to 
simplify the problem by creating a one module that replicate the crash.

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files: bug.py
messages: 265473
nosy: Roy Shmueli
priority: normal
severity: normal
status: open
title: maximum recursion depth when using typing options
type: crash
versions: Python 3.5
Added file: http://bugs.python.org/file42840/bug.py

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