andyan77/.claude/skills/coding-standards-py
.claude/skills/coding-standards-py/SKILL.md
Python 编码规范：PEP 8 命名、mypy strict 类型标注、ruff lint 规则、不可变性模式
development
Updated Apr 16, 2026
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SKILL.md
- description:
- Python 编码规范：PEP 8 命名、mypy strict 类型标注、ruff lint 规则、不可变性模式
Python Coding Standards (diyu-agent)
命名规范 (PEP 8)
| 类型 | 风格 | 示例 |
|------|------|------|
| 模块/包 | snake_case | user_service.py |
| 类 | PascalCase | UserService |
| 函数/方法 | snake_case | get_user_by_id() |
| 常量 | UPPER_SNAKE | MAX_RETRY_COUNT |
| 类型变量 | PascalCase | T = TypeVar("T") |
类型标注 (mypy strict)
项目使用 mypy strict=true，所有代码必须有完整类型标注：
# 正确
async def find_user(user_id: str) -> User | None:
...
# 错误 — mypy strict 会报错
async def find_user(user_id):
...
使用 Python 3.12 原生语法：
str | None而不是Optional[str]list[str]而不是List[str]dict[str, int]而不是Dict[str, int]
Ruff Lint 规则
配置在 pyproject.toml，行长 120 字符。
自动修复：uv run ruff check --fix src/ tests/
格式化：uv run ruff format src/ tests/
不可变性
# Pydantic model — frozen
class UserDTO(BaseModel):
model_config = {"frozen": True}
name: str
email: str
# 函数 — 不修改输入
def update_user(user: dict, name: str) -> dict:
return {**user, "name": name} # 新对象，不修改原对象
文件组织
- 每文件 200-400 行，不超过 800 行
- 按功能/领域组织，不按类型组织
src/ports/只放 ABC 接口src/shared/放跨层共享的类型和工具
禁止
eval(),exec(),__import__()用于用户输入pickle.loads()用于不可信数据- 硬编码密钥/端口/连接字符串
pip install（只用uv）print()留在提交代码中（用 logging）
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