详解Python获取线程返回值的三种方式

ret_values = []

def thread_func(*args):
    ...
    value = ...
    ret_values.append(value)

from threading import Thread

threads = [None] * 10
results = [None] * 10

def foo(bar, result, index):
    result[index] = f"foo-{index}"

for i in range(len(threads)):
    threads[i] = Thread(target=foo, args=('world!', results, i))
    threads[i].start()

for i in range(len(threads)):
    threads[i].join()

print (" ".join(results))

from threading import Thread


def foo(arg):
    return arg


class ThreadWithReturnValue(Thread):
    def run(self):
        if self._target is not None:
            self._return = self._target(*self._args, **self._kwargs)

    def join(self):
        super().join()
        return self._return


twrv = ThreadWithReturnValue(target=foo, args=("hello world",))
twrv.start()
print(twrv.join()) # 此处会打印 hello world。

import concurrent.futures


def foo(bar):
    return bar


with concurrent.futures.ThreadPoolExecutor(max_workers=10) as executor:
    to_do = []
    for i in range(10):  # 模拟多个任务
        future = executor.submit(foo, f"hello world! {i}")
        to_do.append(future)

    for future in concurrent.futures.as_completed(to_do):  # 并发执行
        print(future.result())