Crash on some mypy import when using the --extension-pkg-allow-list=mypy

[sbrunner]

Bug description

When parsing the following example.py:

import mypy.build

Configuration

Command used

pylint --extension-pkg-allow-list=mypy example.py

Pylint output

        pylint crashed with a ``AstroidError`` and with the following stacktrace:


Traceback (most recent call last):
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/pylint/checkers/imports.py", line 1014, in _get_imported_module
    return importnode.do_import_module(modname)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/astroid/nodes/_base_nodes.py", line 168, in do_import_module
    return mymodule.import_module(
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/astroid/nodes/scoped_nodes/scoped_nodes.py", line 462, in import_module
    return AstroidManager().ast_from_module_name(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/astroid/manager.py", line 251, in ast_from_module_name
    return self.ast_from_module(named_module, modname)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/astroid/manager.py", line 356, in ast_from_module
    return AstroidBuilder(self).module_build(module, modname)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/astroid/builder.py", line 101, in module_build
    node = self.inspect_build(module, modname=modname, path=path)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/astroid/raw_building.py", line 463, in inspect_build
    self.object_build(node, module)
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/astroid/raw_building.py", line 504, in object_build
    class_node = object_build_class(node, member, name)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/astroid/raw_building.py", line 265, in object_build_class
    return _base_class_object_build(node, member, basenames, localname=localname)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/astroid/raw_building.py", line 373, in _base_class_object_build
    instdict = member().__dict__
               ^^^^^^^^^^^^^^^^^
AttributeError: 'ModuleNotFound' object has no attribute '__dict__'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/pylint/lint/pylinter.py", line 788, in _lint_file
    check_astroid_module(module)
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/pylint/lint/pylinter.py", line 1017, in check_astroid_module
    retval = self._check_astroid_module(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/pylint/lint/pylinter.py", line 1069, in _check_astroid_module
    walker.walk(node)
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/pylint/utils/ast_walker.py", line 90, in walk
    self.walk(child)
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/pylint/utils/ast_walker.py", line 87, in walk
    callback(astroid)
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/pylint/checkers/imports.py", line 542, in visit_import
    imported_module = self._get_imported_module(node, name)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/pylint/checkers/imports.py", line 1039, in _get_imported_module
    raise astroid.AstroidError from e
astroid.exceptions.AstroidError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/pylint/lint/pylinter.py", line 752, in _lint_files
    self._lint_file(fileitem, module, check_astroid_module)
  File "/home/sbrunner/.pyenv/versions/3.11.9/lib/python3.11/site-packages/pylint/lint/pylinter.py", line 790, in _lint_file
    raise astroid.AstroidError from e
astroid.exceptions.AstroidError

Expected behavior

No crash

Pylint version

pylint 3.3.3
astroid 3.3.8
Python 3.11.9 (main, May 14 2024, 13:36:26) [GCC 13.2.0]

OS / Environment

linux (Linux)

Additional dependencies

mypy==1.14.1

[DanielNoord]

What is ModuleNotFound here? I don't understand how something can be a subclass of Exception and not have __dict__.

[sbrunner]

It's probably this class https://github.com/python/mypy/blob/52c7735ff9e0a1e60c80a31bf6ffd0b0d0d7d8a9/mypy/build.py#L1805 but mypy do a prebuild, and it has this kind or side effect!

>>> import mypy.build
>>> mypy.build.ModuleNotFound().__dict__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'ModuleNotFound' object has no attribute '__dict__'. Did you mean: '__dir__'?

[DanielNoord]

Ah, it is likely do to this change in mypyc: docs.

That might cause more issues in the code, but I guess it makes sense to guard against this. Thanks!

[ei14]

Also running into this crash with the SageMath library, extension-pkg-allow-list=sage option, and the following 1-line Python file:

from sage.numerical import mip

Versions:

pylint 3.3.4                                                                                         
astroid 3.3.8                                                                                        
Python 3.13.2 (main, Feb  5 2025, 08:05:21) [GCC 14.2.1 20250128]