gevent 案例&进程-线程-协程对比

'''下载器'''

import gevent
from gevent import monkey
monkey.patch_all()   

import requests      # urllib 进行封装 爬虫 80-90%用requests


def download(url):
    print('get: %s' % url)
    res = requests.get(url)
    data = res.text
    print(len(data), url)


# g1 = gevent.spawn(download, 'https://www.baidu.com/')
# g2 = gevent.spawn(download, 'https://www.python.org/')
# g3 = gevent.spawn(download, 'https://www.baidu.com/')
#
# g1.join()
# g2.join()
# g3.join()

gevent.joinall([
    gevent.spawn(download, 'https://www.baidu.com/'),
    gevent.spawn(download, 'https://www.python.org/'),
    gevent.spawn(download, 'https://www.baidu.com/')
])

执行结果 ：
get: https://www.baidu.com/
get: https://www.python.org/
get: https://www.baidu.com/
2443 https://www.baidu.com/
2443 https://www.baidu.com/
48734 https://www.python.org/