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claude-config/rules/python/patterns.md
Yaojia Wang 2876cca8fe chore: initial backup of Claude Code configuration
Includes: CLAUDE.md, settings.json, agents, commands, rules, skills,
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and marketplace sources). Excludes credentials, runtime caches,
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2026-03-24 22:26:05 +01:00

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---
paths:
- "**/*.py"
- "**/*.pyi"
---
# Python Patterns
> This file extends [common/patterns.md](../common/patterns.md) with Python specific content.
## Protocol (Duck Typing)
```python
from typing import Protocol
class Repository(Protocol):
def find_by_id(self, id: str) -> dict | None: ...
def save(self, entity: dict) -> dict: ...
```
## Dataclasses as DTOs
```python
from dataclasses import dataclass
@dataclass
class CreateUserRequest:
name: str
email: str
age: int | None = None
```
## Context Managers & Generators
- Use context managers (`with` statement) for resource management
- Use generators for lazy evaluation and memory-efficient iteration
## Reference
See skill: `python-patterns` for comprehensive patterns including decorators, concurrency, and package organization.