{
  "id": "python/flask-import-error-circular",
  "signature": "ImportError: cannot import name 'app' from partially initialized module 'myapp' (most likely due to a circular import)",
  "signature_zh": "导入错误：无法从部分初始化的模块'myapp'导入名称'app'（很可能是由于循环导入）",
  "regex": "ImportError:\\ cannot\\ import\\ name\\ 'app'\\ from\\ partially\\ initialized\\ module\\ 'myapp'\\ \\(most\\ likely\\ due\\ to\\ a\\ circular\\ import\\)",
  "domain": "python",
  "category": "module_error",
  "subcategory": null,
  "root_cause": "Circular imports between Flask application modules, often when views.py imports from app.py and app.py also imports from views.py at module level.",
  "root_cause_type": "generic",
  "root_cause_zh": "Flask应用模块之间的循环导入，常见于views.py从app.py导入，同时app.py也在模块级别从views.py导入。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Moving all imports to the top of each file without restructuring",
      "why_fails": "Doesn't break the cycle; Python still tries to initialize both modules simultaneously.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    },
    {
      "action": "Using 'from myapp import app' inside a function without lazy loading",
      "why_fails": "If the function is called during module initialization, the cycle persists.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Use lazy imports inside functions or request handlers",
      "success_rate": 0.9,
      "how": "def create_app():\n    from myapp.views import some_view\n    app.register_blueprint(some_view)\n    return app",
      "condition": "",
      "sources": []
    },
    {
      "action": "Refactor to use Flask application factory pattern",
      "success_rate": 0.85,
      "how": "# app.py\ndef create_app():\n    app = Flask(__name__)\n    with app.app_context():\n        from . import views\n        app.register_blueprint(views.bp)\n    return app",
      "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": "2024-03-15",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}