---
description: 全面的Python代码审查，确保符合PEP 8标准、类型提示、安全性以及Pythonic惯用法。调用python-reviewer代理。
---

# Python 代码审查

此命令调用 **python-reviewer** 代理进行全面的 Python 专项代码审查。

## 此命令的功能

1. **识别 Python 变更**：通过 `git diff` 查找修改过的 `.py` 文件
2. **运行静态分析**：执行 `ruff`、`mypy`、`pylint`、`black --check`
3. **安全扫描**：检查 SQL 注入、命令注入、不安全的反序列化
4. **类型安全审查**：分析类型提示和 mypy 错误
5. **Pythonic 代码检查**：验证代码是否遵循 PEP 8 和 Python 最佳实践
6. **生成报告**：按严重程度对问题进行归类

## 使用时机

在以下情况使用 `/python-review`：

* 编写或修改 Python 代码后
* 提交 Python 变更前
* 审查包含 Python 代码的拉取请求时
* 接手新的 Python 代码库时
* 学习 Pythonic 模式和惯用法时

## 审查类别

### 关键 (必须修复)

* SQL/命令注入漏洞
* 不安全的 eval/exec 使用
* Pickle 不安全反序列化
* 硬编码的凭证
* YAML 不安全加载
* 隐藏错误的裸 except 子句

### 高 (应该修复)

* 公共函数缺少类型提示
* 可变默认参数
* 静默吞掉异常
* 未对资源使用上下文管理器
* 使用 C 风格循环而非推导式
* 使用 type() 而非 isinstance()
* 无锁的竞态条件

### 中 (考虑)

* 违反 PEP 8 格式规范
* 公共函数缺少文档字符串
* 使用 print 语句而非 logging
* 低效的字符串操作
* 未使用命名常量的魔法数字
* 未使用 f-strings 进行格式化
* 不必要的列表创建

## 运行的自动化检查

```bash
# Type checking
mypy .

# Linting and formatting
ruff check .
black --check .
isort --check-only .

# Security scanning
bandit -r .

# Dependency audit
pip-audit
safety check

# Testing
pytest --cov=app --cov-report=term-missing
```

## 使用示例

````text
User: /python-review

Agent:
# Python Code Review Report

## Files Reviewed
- app/routes/user.py (modified)
- app/services/auth.py (modified)

## Static Analysis Results
✓ ruff: No issues
✓ mypy: No errors
⚠️ black: 2 files need reformatting
✓ bandit: No security issues

## Issues Found

[CRITICAL] SQL Injection vulnerability
File: app/routes/user.py:42
Issue: User input directly interpolated into SQL query
```python
query = f"SELECT * FROM users WHERE id = {user_id}"  # Bad
````

修复：使用参数化查询

```python
query = "SELECT * FROM users WHERE id = %s"  # Good
cursor.execute(query, (user_id,))
```

\[高] 可变默认参数
文件：app/services/auth.py:18
问题：可变默认参数导致共享状态

```python
def process_items(items=[]):  # Bad
    items.append("new")
    return items
```

修复：使用 None 作为默认值

```python
def process_items(items=None):  # Good
    if items is None:
        items = []
    items.append("new")
    return items
```

\[中] 缺少类型提示
文件：app/services/auth.py:25
问题：公共函数缺少类型注解

```python
def get_user(user_id):  # Bad
    return db.find(user_id)
```

修复：添加类型提示

```python
def get_user(user_id: str) -> Optional[User]:  # Good
    return db.find(user_id)
```

\[中] 未使用上下文管理器
文件：app/routes/user.py:55
问题：异常时文件未关闭

```python
f = open("config.json")  # Bad
data = f.read()
f.close()
```

修复：使用上下文管理器

```python
with open("config.json") as f:  # Good
    data = f.read()
```

## 摘要

* 关键：1
* 高：1
* 中：2

建议：❌ 在关键问题修复前阻止合并

## 所需的格式化

运行：`black app/routes/user.py app/services/auth.py`

````

## Approval Criteria

| Status | Condition |
|--------|-----------|
| ✅ Approve | No CRITICAL or HIGH issues |
| ⚠️ Warning | Only MEDIUM issues (merge with caution) |
| ❌ Block | CRITICAL or HIGH issues found |

## Integration with Other Commands

- Use `/python-test` first to ensure tests pass
- Use `/code-review` for non-Python specific concerns
- Use `/python-review` before committing
- Use `/build-fix` if static analysis tools fail

## Framework-Specific Reviews

### Django Projects
The reviewer checks for:
- N+1 query issues (use `select_related` and `prefetch_related`)
- Missing migrations for model changes
- Raw SQL usage when ORM could work
- Missing `transaction.atomic()` for multi-step operations

### FastAPI Projects
The reviewer checks for:
- CORS misconfiguration
- Pydantic models for request validation
- Response models correctness
- Proper async/await usage
- Dependency injection patterns

### Flask Projects
The reviewer checks for:
- Context management (app context, request context)
- Proper error handling
- Blueprint organization
- Configuration management

## Related

- Agent: `agents/python-reviewer.md`
- Skills: `skills/python-patterns/`, `skills/python-testing/`

## Common Fixes

### Add Type Hints
```python
# Before
def calculate(x, y):
    return x + y

# After
from typing import Union

def calculate(x: Union[int, float], y: Union[int, float]) -> Union[int, float]:
    return x + y
````

### 使用上下文管理器

```python
# Before
f = open("file.txt")
data = f.read()
f.close()

# After
with open("file.txt") as f:
    data = f.read()
```

### 使用列表推导式

```python
# Before
result = []
for item in items:
    if item.active:
        result.append(item.name)

# After
result = [item.name for item in items if item.active]
```

### 修复可变默认参数

```python
# Before
def append(value, items=[]):
    items.append(value)
    return items

# After
def append(value, items=None):
    if items is None:
        items = []
    items.append(value)
    return items
```

### 使用 f-strings (Python 3.6+)

```python
# Before
name = "Alice"
greeting = "Hello, " + name + "!"
greeting2 = "Hello, {}".format(name)

# After
greeting = f"Hello, {name}!"
```

### 修复循环中的字符串连接

```python
# Before
result = ""
for item in items:
    result += str(item)

# After
result = "".join(str(item) for item in items)
```

## Python 版本兼容性

审查者会指出代码何时使用了新 Python 版本的功能：

| 功能 | 最低 Python 版本 |
|---------|----------------|
| 类型提示 | 3.5+ |
| f-strings | 3.6+ |
| 海象运算符 (`:=`) | 3.8+ |
| 仅限位置参数 | 3.8+ |
| Match 语句 | 3.10+ |
| 类型联合 (\`x | None\`) | 3.10+ |

确保你的项目 `pyproject.toml` 或 `setup.py` 指定了正确的最低 Python 版本。