如何让python程序暂停几秒钟

可以用两个线程来做这个事情，一个线程用来发网络包，另一个线程用来接收用户输入，然后用两个全局变量控制状态。

作者：二山的小馆er
链接：https://www.zhihu.com/question/366563329/answer/2099631519
来源：知乎
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

import threading
import time

run = True  # global variable to control whether send packet or not
stop = False  # global variable to control quit the program


def handle_user_input():
    global run, stop
    while True:
        flag = input("Input the command?(run/pause/quit)")
        if flag.casefold() == 'run':
            run = True
        elif flag.casefold() == 'pause':
            run = False
        elif flag.casefold() == 'quit':
            stop = True
            break
        else:
            print("Invalid command.")


def fake_send_packet():
    global run, stop
    i = 0
    while True:
        if run:
            print(f"Send a packet {i}...")
            i += 1
        if stop:
            break
        time.sleep(1)


if __name__ == "__main__":
    th1 = threading.Thread(target=handle_user_input)
    th2 = threading.Thread(target=fake_send_packet)
    th1.start()
    th2.start()

输出：