线程打印不正确

Question

我似乎无法使多线程工作。我简化了我的问题，但我仍然无法正确打印我的线程（所以我猜它们没有正确执行）。

import time, threading

s_print_lock = threading.Lock()

def s_print(*a, **b):

    with s_print_lock:
        print(*a, **b)
# Thread safe print function

def a():
    while True:
        s_print('\'a\' is running')
        time.sleep(5)
# Thread 1

def b():
    while True:
        s_print('\'b\' is running')
        time.sleep(5)
# Thread 2

if __name__ == "__main__":
    t1 = threading.Thread(target=a())
    t2 = threading.Thread(target=b())

    t1.start()
    t2.start()

输出为：

'a' is running
'a' is running
'a' is running
'a' is running
...

Answer 1

目标必须是可调用的。您正在执行 a() 所以它进入 while True 循环并且永无止境，因此永远不会启动线程。试试这个：

if __name__ == "__main__":
    t1 = threading.Thread(target=a)
    t2 = threading.Thread(target=b)

    t1.start()
    t2.start()

线程打印不正确

Thread is not printing properly

python

multithreading

python-multithreading

python-3.x