如何在python中创建测验计时器？

import time

def start_timer():
    start_time = time.time()
    return start_time

def stop_timer(start_time):
    end_time = time.time()
    elapsed_time = end_time - start_time
    return elapsed_time

# 使用示例
start = start_timer()

# 这里是你的测验代码
# ...

elapsed = stop_timer(start)
print("测验用时：", elapsed, "秒")