# 错误：pip的依赖解析器与已安装的包'requests==2.25.0'冲突，正在安装'mypackage'

- **ID:** `python/pip-conflict-with-requirement`
- **领域:** python
- **类别:** install_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

请求的包需要已安装包的不同版本，导致依赖冲突。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 3.9 | active | — | — |

## 解决方案

1. **Use a virtual environment to isolate dependencies** (95% 成功率)
   ```
   python -m venv myenv
source myenv/bin/activate
pip install mypackage
   ```
2. **Upgrade or downgrade conflicting package** (85% 成功率)
   ```
   pip install 'requests>=2.26.0'
   ```

## 无效尝试

- **Ignoring dependency with --no-deps** — Installs package without dependencies, may break at runtime. (70% 失败率)
- **Forcing install with --ignore-installed** — Overwrites existing package; may break other installed packages. (60% 失败率)