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from functools import wraps


def trace(name: str):
    def decorator(fn):
        @wraps(fn)
        def wrapper(*args, **kwargs):
            print(f">{name}")
            result = fn(*args, **kwargs)
            print(f"<{name}")
            return result
        return wrapper
    return decorator


@trace("outer")
@trace("middle")
@trace("inner")
def work() -> str:
    print("work")
    return "ok"


result = work()
print(f"result: {result}")

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