{
  "id": "python/flask-logging-handler-error",
  "signature": "KeyError: 'flask.app'",
  "signature_zh": "键错误：'flask.app'",
  "regex": "KeyError:\\ 'flask\\.app'",
  "domain": "python",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "尝试访问 Flask 默认日志记录器时，应用尚未初始化。",
  "root_cause_type": "generic",
  "root_cause_zh": "尝试访问 Flask 默认日志记录器时，应用尚未初始化。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "应用对象未创建。",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "可能返回默认记录器，但无处理器。",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "无法利用日志功能。",
      "fail_rate": 0.5,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 0.95,
      "how": "在应用工厂中创建 app 后访问 app.logger",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.9,
      "how": "使用 Flask 的 app.app_context() 包裹日志代码",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.85,
      "how": "配置日志记录器在应用初始化后",
      "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": 0.82,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2025-09-15",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}