{
  "id": "python/setuptools-discovery-multiple-top-level",
  "signature": "error: Multiple top-level packages discovered in a flat-layout: ['src', 'tests', 'docs'].",
  "signature_zh": "错误：在扁平布局中发现多个顶级包：['src', 'tests', 'docs']。",
  "regex": "error:\\ Multiple\\ top\\-level\\ packages\\ discovered\\ in\\ a\\ flat\\-layout:\\ \\['src',\\ 'tests',\\ 'docs'\\]\\.",
  "domain": "python",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "Setuptools auto-discovery in a flat layout finds more than one candidate package directory and refuses to guess which is the real one.",
  "root_cause_type": "generic",
  "root_cause_zh": "Setuptools 在扁平布局中的自动发现找到多个候选包目录，拒绝猜测哪一个是真正的包。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "MANIFEST.in controls sdist contents, not setuptools package discovery.",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "The discovery error occurs during build regardless of isolation.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Discovery still finds src/ and _tests/ as candidates.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 0.97,
      "how": "[tool.setuptools]\npackages = [\"mypkg\"]\n# or\n[tool.setuptools.packages.find]\nwhere = [\"src\"]\ninclude = [\"mypkg*\"]",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.95,
      "how": "# move mypkg/ to src/mypkg/\n[tool.setuptools.packages.find]\nwhere = [\"src\"]",
      "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": 0.89,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-01-09",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}