{
  "id": "python/packaging-version-invalid-pep440",
  "signature": "packaging.version.InvalidVersion: Invalid version: '1.0.0-beta.1+build_42!'",
  "signature_zh": "packaging.version.InvalidVersion：无效版本：'1.0.0-beta.1+build_42!'",
  "regex": "packaging\\.version\\.InvalidVersion:\\ Invalid\\ version:\\ '1\\.0\\.0\\-beta\\.1\\+build_42!'",
  "domain": "python",
  "category": "data_error",
  "subcategory": null,
  "root_cause": "A version string does not conform to PEP 440. Characters like '!' or malformed pre-release separators ('-beta' vs 'b') are rejected by packaging.version.Version.",
  "root_cause_type": "generic",
  "root_cause_zh": "版本字符串不符合 PEP 440。像 '!' 这样的字符或格式错误的前发布分隔符（'-beta' 而非 'b'）会被 packaging.version.Version 拒绝。",
  "versions": [
    {
      "version": "3.8+",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "LegacyVersion was removed in packaging 22+; importing it raises ImportError. Even when available, comparisons are unreliable.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Produces a different version (e.g. '100beta1build42') that no longer reflects intent and may collide with real releases.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 0.85,
      "how": "from packaging.version import Version, InvalidVersion\nraw = '1.0.0-beta.1+build_42!'.rstrip('!')\nv = Version(raw.replace('-beta', 'b'))\nprint(v)  # 1.0.0b1+build.42",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.9,
      "how": "# pyproject.toml\n[project]\nversion = \"1.0.0b1\"  # PEP 440 pre-release form\n# or use dynamic versioning from git tags via setuptools-scm",
      "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": 0.86,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-08-25",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}