Decorator Patterns Summary

Common decorator patterns: logging, caching, timing, retry, validation, authentication, and rate limiting. Decorators separate cross-cutting concerns from business logic.

Example

# Authentication decorator
def require_auth(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        if not current_user.is_authenticated:
            raise PermissionError("Login required")
        return func(*args, **kwargs)
    return wrapper

@require_auth
def delete_user(user_id):
    # Only runs if authenticated
    pass

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Pro Tip

Decorators shine for cross-cutting concerns — logic that many functions share.

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