# 错误：packaging.requirements.InvalidRequirement：预期字符串结尾，但需求 'requests>=2.25; extra == "security"' 中出现了 ';'

- **ID:** `python/packaging-requirement-parsing-error`
- **领域:** python
- **类别:** data_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

需求字符串错误地使用了 extras 语法；extras 必须用方括号括起来，而不是用分号分隔。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 3.9 | active | — | — |
| 3.10 | active | — | — |

## 解决方案

1. **Use correct extras syntax with square brackets** (95% 成功率)
   ```
   Write: 'requests[security]>=2.25' (extras inside brackets).
   ```
2. **Use environment markers for conditional dependencies** (90% 成功率)
   ```
   Write: 'requests>=2.25; extra == "security"' but note that this is for markers, not extras. For extras, use brackets.
   ```

## 无效尝试

- **Removing the semicolon and extra entirely** — Loses the conditional requirement. (70% 失败率)
- **Using a comma instead of semicolon** — Comma is not valid for extras syntax. (80% 失败率)