python线程池的使用

from concurrent.futures import ThreadPoolExecutor, as_completed, wait,ALL_COMPLETED,FIRST_COMPLETED
import time
# 创建线程池对象，最大线程个数为3
executor = ThreadPoolExecutor(max_workers=3)

def thread_func(times):
    time.sleep(times)
    print(times)
    return times

if None:
    # 通过submit将需要执行函数提交到线程池中，submit会立即返回，不阻塞主线程
    # 线程超过最大数等待之前线程运行结束会复用线程
    task1 = executor