Crash ``argument of type 'Const' is not iterable``

[tjprescott]

Bug description

When parsing the following file:

from azure.core import CaseInsensitiveEnumMeta
from enum import Enum
from six import with_metaclass


class PetEnumPy2Metaclass(with_metaclass(CaseInsensitiveEnumMeta, Enum)):
    DOG = "dog"

pylint crashed with a TypeError and with the following stacktrace:

Traceback (most recent call last):
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\lint\pylinter.py", line 1034, in _check_files
    self._check_file(get_ast, check_astroid_module, file)
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\lint\pylinter.py", line 1069, in _check_file
    check_astroid_module(ast_node)
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\lint\pylinter.py", line 1203, in check_astroid_module
    retval = self._check_astroid_module(
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\lint\pylinter.py", line 1250, in _check_astroid_module
    walker.walk(node)
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\utils\ast_walker.py", line 75, in walk
    self.walk(child)
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\utils\ast_walker.py", line 75, in walk
    self.walk(child)
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\utils\ast_walker.py", line 75, in walk
    self.walk(child)
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\utils\ast_walker.py", line 72, in walk
    callback(astroid)
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\checkers\base.py", line 1994, in visit_assignname
    if not list(frame.local_attr_ancestors(node.name)):
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\astroid\nodes\scoped_nodes\scoped_nodes.py", line 2606, in local_attr_ancestors
    if name in astroid:
TypeError: argument of type 'Const' is not iterable

Configuration

No response

Command used

`python -m pylint ..\apistubgentest`

Pylint output

************* Module apistubgentest.apistubgentest.models._models
F:\repos\azure-sdk-tools\packages\python-packages\apistubgentest\apistubgentest\models\_models.py:38:0: C0301: Line too long (110/100) (line-too-long)
F:\repos\azure-sdk-tools\packages\python-packages\apistubgentest\apistubgentest\models\_models.py:147:0: C0301: Line too long (110/100) (line-too-long)
F:\repos\azure-sdk-tools\packages\python-packages\apistubgentest\apistubgentest\models\_models.py:1:0: C0114: Missing module docstring (missing-module-docstring)
F:\repos\azure-sdk-tools\packages\python-packages\apistubgentest\apistubgentest\models\_models.py:17:0: C0115: Missing class docstring (missing-class-docstring)
F:\repos\azure-sdk-tools\packages\python-packages\apistubgentest\apistubgentest\models\_models.py:18:4: C0203: Metaclass method __getitem__ should have 'cls' as first argument (bad-mcs-method-argument)
F:\repos\azure-sdk-tools\packages\python-packages\apistubgentest\apistubgentest\models\_models.py:29:0: W0613: Unused argument 'kwargs' (unused-argument)
F:\repos\azure-sdk-tools\packages\python-packages\apistubgentest\apistubgentest\models\_models.py:29:4: R0201: Method could be a function (no-self-use)
F:\repos\azure-sdk-tools\packages\python-packages\apistubgentest\apistubgentest\models\_models.py:25:0: R0903: Too few public methods (1/2) (too-few-public-methods)
Exception on node <AssignName.DOG l.48 at 0x1c284a02770> in file 'F:\repos\azure-sdk-tools\packages\python-packages\apistubgentest\apistubgentest\models\_models.py'
Traceback (most recent call last):
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\utils\ast_walker.py", line 72, in walk
    callback(astroid)
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\pylint\checkers\base.py", line 1994, in visit_assignname
    if not list(frame.local_attr_ancestors(node.name)):
  File "C:\Users\travi\.pyenv\pyenv-win\versions\3.10.2\lib\site-packages\astroid\nodes\scoped_nodes\scoped_nodes.py", line 2606, in local_attr_ancestors
    if name in astroid:
TypeError: argument of type 'Const' is not iterable
F:\repos\azure-sdk-tools\packages\python-packages\apistubgentest\apistubgentest\models\_models.py:1:0: F0001: Fatal error while checking '..\apistubgentest\apistubgentest\models\_models.py'. Please open an issue in our bug tracker so we address this. There is a pre-filled template that you can use in 'C:\Users\travi\AppData\Local\pylint\pylint\Cache\pylint-crash-2022-03-18-09.txt'. (fatal)

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Your code has been rated at 5.68/10 (previous run: 8.50/10, -2.82)

Expected behavior

Not crash

Pylint version

Python 3.10.2
pylint 2.12.2
astroid 2.9.3

OS / Environment

Windows 10/11. CMD shell.

Additional dependencies

azure-core

six

[jacobtylerwalls]

Thanks @tjprescott, I edited down your report to a MRE. azure-core and six have to be installed. With that, I can reproduce.

It looks like the same issue as pylint-dev/astroid#713, which another user reported was failing once more about a year ago. But rather than re-open an old issue, I think it makes sense to keep a new one open. (The re-report blamed the changes in pylint-dev/astroid#893.)