# 错误：未找到与 somepackage==999.0.0 匹配的发行版

- **ID:** `python/pip-no-distribution-found`
- **领域:** python
- **类别:** install_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

请求的包版本在 PyPI 或配置的索引上不存在。

## 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. **** (95% 成功率)
   ```
   pip install somepackage==1.2.3
   ```
2. **** (85% 成功率)
   ```
   pip install somepackage==999.0.0 --index-url https://private-pypi.example.com/simple
   ```

## 无效尝试

- **** — Package version unavailability is not a pip version issue; downgrading may break other functionality. (95% 失败率)
- **** — Random URLs do not contain the package; pip will still fail. (100% 失败率)