{
  "id": "python/flask-attributeerror-flask-object-has-no-attribute-run",
  "signature": "AttributeError: 'Flask' object has no attribute 'run'",
  "signature_zh": "AttributeError: 'Flask' 对象没有属性 'run'",
  "regex": "AttributeError:\\ 'Flask'\\ object\\ has\\ no\\ attribute\\ 'run'",
  "domain": "python",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "The Flask app object was not created correctly, possibly due to a naming conflict or incorrect instantiation.",
  "root_cause_type": "generic",
  "root_cause_zh": "Flask 应用对象未正确创建，可能是由于命名冲突或实例化错误。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Using 'app = Flask' instead of 'app = Flask(__name__)'.",
      "why_fails": "Flask is a class; without instantiation, 'app' is the class itself, not an instance.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "Overwriting the app variable with another object.",
      "why_fails": "If you assign a different object to 'app', it loses the Flask methods.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Instantiate Flask correctly.",
      "success_rate": 0.95,
      "how": "from flask import Flask\napp = Flask(__name__)\napp.run()",
      "condition": "",
      "sources": []
    },
    {
      "action": "Check for variable name conflicts.",
      "success_rate": 0.9,
      "how": "# Ensure 'app' is not used elsewhere\napp = Flask(__name__)\n# Avoid: app = some_other_object",
      "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": 0.85,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-11-08",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}