python线程池

https://blog.csdn.net/qq_33961117/article/details/82587873
#!/usr/bin/python
# -*- coding: utf-8 -*-
from concurrent.futures import ThreadPoolExecutor
from threading import current_thread
import time
import requests


def get(url):
    print('%s GET %s' % (current_thread().name, url))
    time.sleep(3)
    response = requests.get(url)
    if response.status_code == 200:
        res = response.text
    else:
        res = '下载失败'
    return res


def parse(future):
    time.sleep(1)
    res = future.result()
    print('%s 解析结果为%s' % (current_thread().name, len(res)))


if __name__ == '__main__':
    urls = [
        'https://www.baidu.com',
        'https://www.sina.com.cn',
        'https://www.tmall.com',
        'https://www.jd.com',
        'https://www.python.org',
        'https://www.openstack.org',
        'https://www.baidu.com',
        'https://www.baidu.com',
        'https://www.baidu.com',

    ]
    # 线程池内线程数
    p = ThreadPoolExecutor()# ThreadPoolExecutor(4)  最多启用4个线程 不给则使用计算机的最大线程数
    start = time.time()
    for url in urls:
        future = p.submit(get, url)
        future.add_done_callback(parse)

    p.shutdown(wait=True)

    print('主', current_thread().name)
    print('完成时间', time.time() - start)