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---
paths:
- "**/*.py"
- "**/*.pyi"
---
# Python パターン
> このファイルは [common/patterns.md](../common/patterns.md) を Python 固有のコンテンツで拡張します。
## Protocol(ダックタイピング)
```python
from typing import Protocol
class Repository(Protocol):
def find_by_id(self, id: str) -> dict | None: ...
def save(self, entity: dict) -> dict: ...
```
## DTO としての Dataclass
```python
from dataclasses import dataclass
@dataclass
class CreateUserRequest:
name: str
email: str
age: int | None = None
```
## コンテキストマネージャとジェネレータ
- リソース管理にはコンテキストマネージャ(`with` 文)を使用する
- 遅延評価とメモリ効率の良いイテレーションにはジェネレータを使用する
## リファレンス
スキル: `python-patterns` でデコレータ、並行処理、パッケージ構成を含む包括的なパターンを参照してください。