Timer 计时器

• 写一个计时类

import timeclass Timer:def __init__(self):self.start_time = Noneself.end_time = Noneself.elapsed_time = None# 上下文管理器方法，支持 with 语句def __enter__(self):self.start_time = time.time()return selfdef __exit__(self, exc_type, exc_val, exc_tb):self.end_time = time.time()self.elapsed_time = self.end_time - self.start_timeprint(f"Elapsed time: {self.elapsed_time:.6f} seconds")# 手动计时方法def start(self):self.start_time = time.time()def stop(self):self.end_time = time.time()self.elapsed_time = self.end_time - self.start_timereturn self.elapsed_time# 装饰器方法，用来计时任意函数@staticmethoddef timer_decorator(func):def wrapper(*args, **kwargs):timer = Timer()  # 创建 Timer 实例timer.start()result = func(*args, **kwargs)timer.stop()print(f"Function '{func.__name__}' executed in {timer.elapsed_time:.6f} seconds")return resultreturn wrapper# 使用静态方法作为装饰器
@Timer.timer_decorator 
def example_function(n):return sum([i**2 for i in range(n)])# 调用函数
result = example_function(1000000)

• 结果：

Function 'example_function' executed in 0.262828 seconds