以单独类的形式计算时间执行，其中函数是变量

import time

class Timer:
    def __init__(self):
        self.start_time = None

    def start(self):
        self.start_time = time.perf_counter()

    def stop(self):
        if self.start_time is None:
            raise RuntimeError("Timer has not been started")
        elapsed_time = time.perf_counter() - self.start_time
        self.start_time = None
        return elapsed_time

# 使用示例
timer = Timer()
timer.start()

# 这里放置需要测量执行时间的代码
time.sleep(1)  # 假设这是一个耗时的操作

elapsed = timer.stop()
print(f"Elapsed time: {elapsed:.6f} seconds")

import threading

class ThreadSafeTimer:
    def __init__(self):
        self.start_time = None
        self.lock = threading.Lock()

    def start(self):
        with self.lock:
            self.start_time = time.perf_counter()

    def stop(self):
        with self.lock:
            if self.start_time is None:
                raise RuntimeError("Timer has not been started")
            elapsed_time = time.perf_counter() - self.start_time
            self.start_time = None
            return elapsed_time