python-development

# Python Development

Core Python language concepts, idioms, and best practices.

## Core Expertise

- **Python Language**: Modern Python 3.10+ features and idioms
- **Best Practices**: Pythonic code, design patterns, SOLID principles
- **Debugging**: Interactive debugging and profiling techniques
- **Performance**: Optimization strategies and profiling
- **Async Programming**: async/await patterns and asyncio

## Modern Python Features (3.10+)

### Type Hints

```python
# Modern syntax (Python 3.10+)
def process_items(
    items: list[str],                    # Not List[str]
    mapping: dict[str, int],             # Not Dict[str, int]
    optional: str | None = None,         # Not Optional[str]
) -> tuple[bool, str]:                   # Not Tuple[bool, str]
    """Process items with modern type hints."""
    return True, "success"

# Type aliases
type UserId = int
type UserDict = dict[str, str | int]

def get_user(user_id: UserId) -> UserDict:
    return {"id": user_id, "name": "Alice"}
```

### Pattern Matching (3.10+)

```python
def handle_command(command: dict) -> str:
    match command:
        case {"action": "create", "item": item}:
            return f"Creating {item}"
        case {"action": "delete", "item": item}:
            return f"Deleting {item}"
        case {"action": "list"}:
            return "Listing items"
        case _:
            return "Unknown command"
```

### Structural Pattern Matching

```python
def process_response(response):
    match response:
        case {"status": 200, "data": data}:
            return process_success(data)
        case {"status": 404}:
            raise NotFoundError()
        case {"status": code} if code >= 500:
            raise ServerError(code)
```

## Python Idioms

### Context Managers

```python
# File handling
with open("file.txt") as f:
    content = f.read()

# Custom context manager
from contextlib import contextmanager

@contextmanager
def database_connection():
    conn = create_connection()