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import time
from functools import wraps

def timer_decorator(func):
    @wraps(func)  # 保留原函数的元信息
    def wrapper(*args, **kwargs):
        start_time = time.perf_counter()  # 高精度计时开始
        result = func(*args, **kwargs)    # 执行原函数并获取结果
        end_time = time.perf_counter()    # 计时结束
        elapsed = end_time - start_time
        print(f"函数 {func.__name__} 执行耗时: {elapsed:.4f} 秒")
        return result  # 返回原函数结果
    return wrapper


@timer_decorator
def add_numbers(a, b):
    time.sleep(0.5)  # 模拟耗时操作
    return a + b

# 调用函数，自动计时
sum_result = add_numbers(3, 4)
print(f"计算结果: {sum_result}")