Python实现从线程获取返回值

from threading import Thread

# 一个线程的函数
def first_function():
    print('Hello World')

print("main program start")

thread_1 = Thread(target=first_function)
thread_2 = Thread(target=first_function)
thread_1.start()
thread_2.start()

print("main ends")

from threading import Thread

def first_function(name, id):
    print('Hello World from', name, "ID=", id)

thread_1 = Thread(target=first_function, args=("Thread 1", 1))
thread_2 = Thread(target=first_function, args=("Thread 2", 2))
thread_1.start()
thread_2.start()

from threading import Thread

def first_function(first_argu, return_val):
    print(first_argu)
    return_val[0] = "Return Value from " + first_argu

return_val_from_1 = [None] * 1
return_val_from_2 = [None] * 1

thread_1 = Thread(target=first_function, args=("Thread 1", return_val_from_1))
thread_2 = Thread(target=first_function, args=("Thread 2", return_val_from_2))

thread_1.start()
thread_2.start()

thread_1.join()
thread_2.join()

print(return_val_from_1)
print(return_val_from_2)

from threading import Thread

def first_function(first_argu):
    print(first_argu)
    return "Return Value from " + first_argu

class NewThread(Thread):
    def __init__(self, group=None, target=None, name=None,
                 args=(), kwargs={}):
        Thread.__init__(self, group, target, name, args, kwargs)
    def run(self):
        if self._target != None:
            self._return = self._target(*self._args, **self._kwargs)
    def join(self, *args):
        Thread.join(self, *args)
        return self._return

thread_1 = NewThread(target=first_function, args=("Thread 1",))
thread_2 = NewThread(target=first_function, args=("Thread 2",))

thread_1.start()
thread_2.start()

print(thread_1.join())
print(thread_2.join())