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pytorch - ✅(Solved) Fix [Python 3.14] Deprecated ast.Str call in flake8-simplify [1 pull requests, 1 participants]

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pytorch/pytorch#182158•Fetched 2026-05-02 05:26:56
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Error Message

AttributeError: module 'ast' has no attribute 'Str'

Fix Action

Fix / Workaround

As linters in PyTorch are running in ephemeral uv venvs, it can be easily fixed by bumping flake8-simplify package to 0.30.0.

PR fix notes

PR #182160: [Python 3.14] Bump flake8-simplify version

Description (problem / solution / changelog)

Fixes https://github.com/pytorch/pytorch/issues/182158

Python 3.14 removes legacy AST node classes (ast.Str, ast.Num, ast.NameConstant, etc.) that were deprecated since Python 3.8 and replaced by ast.Constant (see Python 3.14 docs).

This affects astor used by flake8-simplify for AST, so invoking lintrunner on flake8 will throw

AttributeError: module 'ast' has no attribute 'Str'

As linters in PyTorch are running in ephemeral uv venvs, it can be easily fixed by bumping flake8-simplify package to 0.30.0.

Changed files

  • tools/linter/adapters/flake8_linter.py (modified, +1/-1)

Code Example

AttributeError: module 'ast' has no attribute 'Str'

---

intrunner --take FLAKE8 --all-files
RAW_BUFFERClick to expand / collapse

🐛 Describe the bug

Python 3.14 removes legacy AST node classes (ast.Str, ast.Num, ast.NameConstant, etc.) that were deprecated since Python 3.8 and replaced by ast.Constant (see Python 3.14 docs).

This affects astor used by flake8-simplify for AST, so invoking lintrunner on flake8 will throw

AttributeError: module 'ast' has no attribute 'Str'

As linters in PyTorch are running in ephemeral uv venvs, it can be easily fixed by bumping flake8-simplify package to 0.30.0.

Reproducer

intrunner --take FLAKE8 --all-files

Versions

Not tied to any specific PyTorch version, as it's linter issue.

OS: Ubuntu 26.04 LTS (x86_64) Python version: 3.14.4 (main, Apr 8 2026, 04:02:31) [GCC 15.2.0] (64-bit runtime) Python platform: Linux-7.0.0-14-generic-x86_64-with-glibc2.43

cc @seemethere @malfet @pytorch/pytorch-dev-infra

extent analysis

TL;DR

Update the flake8-simplify package to version 0.30.0 to resolve the AttributeError caused by the removal of legacy AST node classes in Python 3.14.

Guidance

  • The issue is caused by the removal of legacy AST node classes in Python 3.14, which are used by flake8-simplify.
  • To fix the issue, update the flake8-simplify package to version 0.30.0, which is compatible with Python 3.14.
  • Run the intrunner --take FLAKE8 --all-files command again after updating the package to verify that the issue is resolved.
  • Ensure that the update is applied to the ephemeral uv venvs where the linters are running.

Example

No code snippet is necessary for this issue, as it can be resolved by updating the flake8-simplify package.

Notes

This solution assumes that the issue is solely caused by the removal of legacy AST node classes in Python 3.14 and that updating the flake8-simplify package will resolve the issue.

Recommendation

Apply workaround: Update the flake8-simplify package to version 0.30.0, as it is a straightforward and targeted solution to the issue.

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pytorch - ✅(Solved) Fix [Python 3.14] Deprecated ast.Str call in flake8-simplify [1 pull requests, 1 participants]