每一个线程基本上包含3个元素:程序计数器,寄存器和栈。 线程的状态大体上可以分为ready,running,blocked。 多线程编程一般使用共享内容空间进行线程间的通讯,这就使管理内容空间成为多线程编程的重点和难点。 线程的典型应用是应用软件的并行化。 相比于进程,使用线程的优势主要是性能。 1.2 threading库实现多线程# 1...
print(psutil.virtual_memory()) # svmem(total=17029259264, available=8437215232, percent=50.5, used=8592044032, free=8437215232) total: 总内存 available: 可用内存 percent: 内存使用率 used: 已使用的内存 查看交换内存信息 import psutil print(psutil.swap_memory()) # sswap(total=19579396096, used=157...
AI代码解释 importmultiprocessingdefsquare(number):returnnumber**2if__name__=='__main__':numbers=[1,2,3,4,5]withmultiprocessing.Pool()aspool:results=pool.map(square,numbers)total=sum(results)print(f"The sum of squares is:{total}") 在上面的例子中,我们使用multiprocessing.Pool创建了一个进程...
AI代码解释 deftailrecsum(x,running_total=0):ifx==0:returnrunning_totalelse:returntailrecsum(x-1,running_total+x)# 尾递归的返回是调用自身 调用tailrecsum(5),Python调试器中发生如下状况: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 tailrecum(5,0)tailrecum(4,5)tailrecum(3,9)tailrecum(...
def run(main, *, debug=False): if events._get_running_loop() is not None: raise RuntimeError( "asyncio.run() cannot be called from a running event loop") if not coroutines.iscoroutine(main): raise ValueError("a coroutine was expected, got {!r}".format(main)) loop = events.new_...
long_running_task() # 输出任务执行耗时 5.2.2 contextlib上下文管理器与with语句的使用 contextlib模块提供的contextmanager装饰器可以帮助我们轻松创建上下文管理器,确保在进入和退出特定代码块时执行必要的设置和清理工作。例如,一个简单的文件操作上下文管理器: ...
Total time running dict_matched002: 1.4066696167e-05 seconds 2. 使用timeit模块 另一种方法是使用timeit模块,用来计算平均时间消耗。 执行下面的脚本可以运行该模块。 1 python -m timeit -n 4 -r 5 -s "import timing_functions" "timing_functions.random_sort(2000000)" 这里的timing_functions是Python脚...
SUM(trips) over (order BY date rows unbounded preceding) AS running_total_trips, -- Window function to calculate the running total number of ride share trips lag(trips,7) over (order BY date) AS num_trips_previous_day, -- Window function to grab the number of trips on the previous day...
logging.warning('The current device was successfully deployed last time, ' 'and the TIME_SN configured this time is the same as that of the last time. ' 'Please check!') raise ZTPAbort('There is no need to continue!') elif ztp_status == str(ZTP_STATUS_RUNNING): # The device ...
在SQL Server 2016 上執行 R Server 8.0.3 時,您可能會接收到錯誤訊息: You are running version 9.0.0 of Microsoft R client on your computer, which is incompatible with the Microsoft R server version 8.0.3. Download and install a compatible version. SQL Server 2016 中與...