原因：主線程要控制其他線程的執行
注意：event.wait(timeout) 要設置超時時間【看註釋哦】，可以理解一下守護線程。
# coding=utf-8
import logging
import threading
import time
from threading import Event
logging.basicConfig(
level=logging.INFO,
format="%(asctime)s [*] %(threadName)s %(message)s"
)
threads = []
event = Event()
def test (event):
# 1.準備中---------------------------------------------
while not event.isSet():
logging.info(f" is ready")
time.sleep(1)
# 2.等待通知------------------------------------------
event.wait(0.1) # daemon=True設置守護線程，0.1秒後隨着主線程退出
# 3.運行中--------------------------------------------
while event.isSet():
logging.info(f" is running")
time.sleep(1)
def main ():
logging.info("------ 主線程開始 --------")
# 2個線程
for i in range(2):
threads.append(threading.Thread(target=test, args=(event,), daemon=True))
# 阻塞啓動線程---------------------------
for t in threads:
t.start()
# 這裏就不要了，因爲會阻塞主線程
# for t in threads:
# t.join()
time.sleep(3)
logging.info("-------------- event is set")
event.set()
time.sleep(3)
logging.info("------------ event is clear")
event.clear()
logging.info("------- 主線程結束 --------")
if __name__ == '__main__':
main()
輸出：
2019-10-02 18:25:15,171 [*] MainThread ------ 主線程開始 --------
2019-10-02 18:25:15,172 [*] Thread-1 is ready
2019-10-02 18:25:15,172 [*] Thread-2 is ready
2019-10-02 18:25:16,173 [*] Thread-2 is ready
2019-10-02 18:25:16,173 [*] Thread-1 is ready
2019-10-02 18:25:17,174 [*] Thread-1 is ready
2019-10-02 18:25:17,174 [*] Thread-2 is ready
2019-10-02 18:25:18,173 [*] MainThread -------------- event is set
2019-10-02 18:25:18,176 [*] Thread-2 is running
2019-10-02 18:25:18,176 [*] Thread-1 is running
2019-10-02 18:25:19,176 [*] Thread-2 is running
2019-10-02 18:25:19,178 [*] Thread-1 is running
2019-10-02 18:25:20,178 [*] Thread-2 is running
2019-10-02 18:25:20,178 [*] Thread-1 is running
2019-10-02 18:25:21,173 [*] MainThread ------------ event is clear
2019-10-02 18:25:21,173 [*] MainThread ------- 主線程結束 --------