{
  "id": "python/pip-extras-unknown-extra",
  "signature": "WARNING: foo 1.0.0 does not provide the extra 'devtools'",
  "signature_zh": "警告：foo 1.0.0 不提供额外项 'devtools'",
  "regex": "WARNING:\\ foo\\ 1\\.0\\.0\\ does\\ not\\ provide\\ the\\ extra\\ 'devtools'",
  "domain": "python",
  "category": "install_error",
  "subcategory": null,
  "root_cause": "Requesting an extra that isn't declared in the package metadata.",
  "root_cause_type": "generic",
  "root_cause_zh": "请求了包元数据中未声明的额外项。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "The extra simply doesn't exist in metadata; forcing does not create it.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "If 'all' extra is also undefined, same warning.",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 0.9,
      "how": "python -m pip show foo\npip install \"foo[dev]\"",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.8,
      "how": "pip install pytest black  # dependencies the extra would have pulled",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": null,
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.83,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2025-07-29",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}