python data_error ai_generated true

packaging.markers.UndefinedEnvironmentName: 'extra' is not defined in environment markers

ID: python/packaging-marker-evaluation-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
82%Confidence
0Evidence
2025-04-18First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —
3.10 active — — —
3.11 active — — —
3.12 active — — —

Root Cause

The marker uses 'extra' which is only valid in certain contexts like requirements files, not in all marker evaluations.

generic

中文

标记使用了 'extra'，该标记仅在需求文件等特定上下文中有效，并非在所有标记评估中都有效。

Workarounds

  1. 90% success 
    Requirement('package; sys_platform == "linux"')
  2. 85% success 
    from packaging.markers import Marker; m = Marker('extra == "test"'); m.evaluate({'extra': 'test'})

Dead Ends

Common approaches that don't work:

  1. 80% fail

    The marker evaluation does not read arbitrary environment variables; 'extra' is a special key.

  2. 50% fail

    Ignoring may lead to incorrect dependency resolution.