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())

hello world! 8
hello world! 3
hello world! 5
hello world! 2
hello world! 9
hello world! 7
hello world! 4
hello world! 0
hello world! 1
hello world! 6