注意join的位置
import threading
import time
print('程序开始时间：', time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(int(time.time()))))
start = time.time()
def thread_1():
print("T1 startn")
for i in range(10):
time.sleep(0.1)
end = time.time()
print('thread_1程序结束时间：', time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(int(time.time()))))
print('thread_1程序用时:', end - start, 's')
print("T1 finishn")
def thread_2():
print("T2 startn")
for i in range(10):
time.sleep(0.1)
end = time.time()
print('thread_2程序结束时间：', time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(int(time.time()))))
print('thread_2程序用时:', end - start, 's')
print("T2 finishn")
def main():
thread1 = threading.Thread(target=thread_1)
thread1.start()
# thread1.join() # join的作用： 后面的代码等thread1进程运行完后再运行
thread2 = threading.Thread(target=thread_2)
thread2.start()
# thread2.join()
print("all donen")
end = time.time()
print('main程序结束时间：', time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(int(time.time()))))
print('main程序用时:', end - start, 's')
if __name__ == '__main__':
main()
无join的控制台输出
"C:Program FilesPython310python.exe" D:/workspace/Python_workspace/YunShiWei/th.py 程序开始时间： 2022-05-08 22:29:19 T1 start T2 start all done main程序结束时间： 2022-05-08 22:29:19 main程序用时: 0.0019943714141845703 s thread_2程序结束时间： 2022-05-08 22:29:20 thread_2程序用时: 1.1100966930389404 s T2 finish thread_1程序结束时间： 2022-05-08 22:29:20 thread_1程序用时: 1.1100966930389404 s T1 finish 进程已结束,退出代码0
有join的控制台输出
"C:Program FilesPython310python.exe" D:/workspace/Python_workspace/YunShiWei/th.py 程序开始时间： 2022-05-08 22:29:37 T1 start thread_1程序结束时间： 2022-05-08 22:29:38 thread_1程序用时: 1.1040937900543213 s T1 finish T2 start thread_2程序结束时间： 2022-05-08 22:29:39 thread_2程序用时: 2.217207431793213 s T2 finish all done main程序结束时间： 2022-05-08 22:29:39 main程序用时: 2.217207431793213 s 进程已结束,退出代码0代码2
注意join的位置
import threading
import time
print('程序开始时间：', time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(int(time.time()))))
start = time.time()
def thread_1():
print("T1 startn")
for i in range(10):
time.sleep(0.1)
end = time.time()
print('thread_1程序结束时间：', time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(int(time.time()))))
print('thread_1程序用时:', end - start, 's')
print("T1 finishn")
def thread_2():
print("T2 startn")
for i in range(10):
time.sleep(0.1)
end = time.time()
print('thread_2程序结束时间：', time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(int(time.time()))))
print('thread_2程序用时:', end - start, 's')
print("T2 finishn")
def main():
thread1 = threading.Thread(target=thread_1)
thread2 = threading.Thread(target=thread_2)
thread1.start()
thread2.start()
thread1.join() # join的作用： 后面的代码等thread1进程运行完后再运行
thread2.join()
print("all donen")
end = time.time()
print('main程序结束时间：', time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(int(time.time()))))
print('main程序用时:', end - start, 's')
if __name__ == '__main__':
main()
控制台输出（有join）
"C:Program FilesPython310python.exe" D:/workspace/Python_workspace/YunShiWei/th.py 程序开始时间： 2022-05-08 22:42:57 T1 start T2 start thread_2程序结束时间：thread_1程序结束时间： 2022-05-08 22:42:58 thread_1程序用时: 1.1070094108581543 s 2022-05-08 22:42:58 thread_2程序用时: 1.1070094108581543 s T2 finish T1 finish all done main程序结束时间： 2022-05-08 22:42:58 main程序用时: 1.1070094108581543 s 进程已结束,退出代码0
大佬对join的讲解：【莫烦Python】Threading 学会多线程 Python_哔哩哔哩_bilibilihttps://www.bilibili.com/video/BV1jW411Y7Wj?p=3
