{
  "id": "python/pytest-assert-dict-subset",
  "signature": "AssertionError: assert {'a': 1, 'b': 2} == {'a': 1}",
  "signature_zh": "断言错误：字典相等性比较失败",
  "regex": "AssertionError:\\ assert\\ \\{'a':\\ 1,\\ 'b':\\ 2\\}\\ ==\\ \\{'a':\\ 1\\}",
  "domain": "python",
  "category": "data_error",
  "subcategory": null,
  "root_cause": "直接使用 == 比较字典，但只期望检查子集，导致测试失败。",
  "root_cause_type": "generic",
  "root_cause_zh": "直接使用 == 比较字典，但只期望检查子集，导致测试失败。",
  "versions": [
    {
      "version": "3.8",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "手动循环比较",
      "why_fails": "尝试使用 dict.items() 循环比较，但代码冗长且易错",
      "fail_rate": 0.5,
      "condition": "",
      "sources": []
    },
    {
      "action": "使用 in 操作符",
      "why_fails": "尝试使用 assert dict1 in dict2，但语法不支持",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "使用 items 子集比较",
      "success_rate": 0.9,
      "how": "assert expected.items() <= actual.items()",
      "condition": "",
      "sources": []
    },
    {
      "action": "合并字典后比较",
      "success_rate": 0.85,
      "how": "assert actual == {**expected, **actual}",
      "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": 0.88,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-10-01",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}