Description

bblommers

opened on May 14, 2026

Issue body actions

Bug report

Bug description:

Invoking the venv module results in a KeyError:

Error in import line from /usr/lib/python3/dist-packages/ruamel.yaml-0.17.16-nspkg.pth: import sys, types, os;has_mfs = sys.version_info > (3, 5);p = os.path.join(sys._getframe(1).f_locals['sitedir'], *('ruamel',));importlib = has_mfs and __import__('importlib.util');has_mfs and __import__('importlib.machinery');m = has_mfs and sys.modules.setdefault('ruamel', importlib.util.module_from_spec(importlib.machinery.PathFinder.find_spec('ruamel', [os.path.dirname(p)])));m = m or sys.modules.setdefault('ruamel', types.ModuleType('ruamel'));mp = (m or []) and m.__dict__.setdefault('__path__',[]);(p not in mp) and mp.append(p)
  Traceback (most recent call last):
    File "<frozen site>", line 325, in _exec_imports
    File "<string>", line 1, in <module>
  KeyError: "local variable ''sitedir'' is not defined"

OS details

Distributor ID: Ubuntu
Description: Ubuntu 22.04.5 LTS
Release: 22.04
Codename: jammy

Python details

Clean installation using sudo apt install python3.15 python3.15-dev python3.15-venv.

Version: Python 3.15.0b1

CPython versions tested on:

3.15

Operating systems tested on:

Linux

Activity

1. bblommers

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on May 14, 2026
2. tomasr8

   added

   topic-venvRelated to the venv moduleRelated to the venv module

   on May 14, 2026
3. hugovk commented on May 14, 2026

   

   hugovk

   on May 14, 2026

   Member

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   When you say crash, does it fail to create the venv315 dir, or does it create it despite the error message?

   ---

   Looks like a duplicate of #149671.

   ruamel.yaml 0.17.16 is from 2021:

   • https://pypi.org/project/ruamel.yaml/0.17.16/

   And contains an old *py3.9-nspkg.pth file:

   • https://inspector.pypi.io/project/ruamel-yaml/0.17.16/packages/d3/cc/248dfb697bb98152c187ced584e505124ed952529d7f8e74b28f6f4d6f31/ruamel.yaml-0.17.16-py3-none-any.whl/

   The latest 0.19.1 is from this year:

   • https://pypi.org/project/ruamel.yaml/0.19.1/

   And the wheel no longer contains that legacy file:

   • https://inspector.pypi.io/project/ruamel-yaml/0.19.1/packages/b8/0c/51f6841f1d84f404f92463fc2b1ba0da357ca1e3db6b7fbda26956c3b82a/ruamel_yaml-0.19.1-py3-none-any.whl/
4. bblommers commented on May 14, 2026

   

   bblommers

   on May 14, 2026

   Author

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   Hi @hugovk!

   You're right, the venv is created despite the error, and (from what I can tell) everything works as it should. I can source it as normal and install dependencies.

   I did notice the other issue - but I wasn't sure whether it was actually the same root cause. Happy to close this if you think it is a straight duplicate!
5. hugovk commented on May 14, 2026

   

   hugovk

   on May 14, 2026

   Member

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   Yes, let's close as duplicate. Thanks for the report, it helps to see other occurrences.

   Reacted by Bert Blommers
6. hugovk

   closed this as a duplicateof PEP 829: KeyError: "local variable ''sitedir'' is not defined" #149671 on May 14, 2026

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