import requests
import time
from multiprocessing.dummy import Pool

headers = {
    'user-agent' : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36'
}

urls = [
    'https://sp1.baidu.com/',
    'https://sp1.baidu.com/',
    'https://sp1.baidu.com/',
    'https://www.baidu.com/'
]


def get_url(url):
    print('正在访问',url)
    res = requests.get(url=url,headers=headers)
    print('访问状态：',res.status_code)
    # time.sleep(2)


while True:
    pool = Pool(20)
    pool.map(get_url,urls)