python 创建线程池

import threading
from concurrent.futures.thread import ThreadPoolExecutor

lock = threading.Lock()


def func(x, y):
    """
    打印 x 次 y
    """

    global lock
    for i in range(x):
        with lock:
            print(y)


# 线程池最大线程数 3
with ThreadPoolExecutor(max_workers=3) as e:
    futureList = []
    for i in range(10):
        # 创建 10 个future 对象放到 futureList
        # e.submit 提交给线程池
        futureList.append(e.submit(func, i, i))  # i, i 为传入 func 的两个参数
    [i.result() for i in futureList]  # 将 futureList 里的任务丢到线程池