# 错误：无法安装 package1 和 package2，因为它们的依赖关系冲突。解析器：检测到循环依赖：package1 -> package2 -> package1

- **ID:** `python/pip-resolver-dependency-cycle`
- **领域:** python
- **类别:** install_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

依赖关系图包含循环，使得无法满足所有需求。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 3.8 | active | — | — |
| 3.9 | active | — | — |
| 3.10 | active | — | — |
| 3.11 | active | — | — |
| 3.12 | active | — | — |

## 解决方案

1. **** (80% 成功率)
   ```
   pip install package1==1.1 package2==2.1  # versions that don't depend on each other
   ```
2. **** (70% 成功率)
   ```
   pip install package1 package2 --use-deprecated=legacy-resolver
   ```

## 无效尝试

- **** — Ignores dependencies entirely, but the cycle remains; runtime errors are likely. (60% 失败率)
- **** — The cycle is inherent; order does not resolve it. (90% 失败率)