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maximum recursion depth when using typing options #71201

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RoyShmueli mannequin opened this issue May 13, 2016 · 7 comments
Closed

maximum recursion depth when using typing options #71201

RoyShmueli mannequin opened this issue May 13, 2016 · 7 comments
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@gvanrossum
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type-crash A hard crash of the interpreter, possibly with a core dump

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@RoyShmueli
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RoyShmueli mannequin commented May 13, 2016

BPO 27014
Nosy @gvanrossum
Files
  • bug.py: a file that replicates the bug
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = 'https://github.com/gvanrossum'
closed_at = <Date 2016-05-18.15:46:14.107>
created_at = <Date 2016-05-13.12:57:16.728>
labels = ['type-crash']
title = 'maximum recursion depth when using typing options'
updated_at = <Date 2016-05-18.15:46:14.105>
user = 'https://bugs.python.org/RoyShmueli'

    bugs.python.org fields:

    activity = <Date 2016-05-18.15:46:14.105>
actor = 'gvanrossum'
assignee = 'gvanrossum'
closed = True
closed_date = <Date 2016-05-18.15:46:14.107>
closer = 'gvanrossum'
components = []
creation = <Date 2016-05-13.12:57:16.728>
creator = 'Roy Shmueli'
dependencies = []
files = ['42840']
hgrepos = []
issue_num = 27014
keywords = []
message_count = 7.0
messages = ['265473', '265499', '265566', '265787', '265789', '265830', '265831']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'python-dev', 'Roy Shmueli']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue27014'
versions = ['Python 3.5', 'Python 3.6']
    @RoyShmueli
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    RoyShmueli mannequin commented May 13, 2016

    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.

    @RoyShmueli RoyShmueli mannequin added the type-crash A hard crash of the interpreter, possibly with a core dump label May 13, 2016
    @gvanrossum
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    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.

    @gvanrossum gvanrossum self-assigned this May 13, 2016
    @gvanrossum
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    Simpler repro:

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

    No progress yet in understanding. :-(

    @gvanrossum
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    See also python/mypy#1546 -- possibly it's the same issue.

    @gvanrossum
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    Actually, see python/typing#222 instead.

    @python-dev
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    python-dev mannequin commented May 18, 2016

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

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

    @gvanrossum
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    Thanks to Kalle Tuure for the fix!

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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