python3协程小例子 gevent

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from gevent import monkey
monkey.patch_all()
import gevent
import urllib.request

def run_task(url):
    print('Visit --> %s' % url)
    try:
        response = urllib.request.urlopen(url)
        data = response.read()
        print('%d bytes received from %s.' % (len(data), url))
    except Exception as e:
        print(e)

if __name__ == '__main__':
    urls = ['https://www.baidu.com','https://docs.python.org/3/library/urllib.html','https://www.cnblogs.com/wangmo/p/7784867.html']
    greenlets = [gevent.spawn(run_task, url) for url in urls]
    gevent.joinall(greenlets)

运行结果如下：

Visit --> https://www.baidu.com
Visit --> https://docs.python.org/3/library/urllib.html
Visit --> https://www.cnblogs.com/wangmo/p/7784867.html
227 bytes received from https://www.baidu.com.
9850 bytes received from https://docs.python.org/3/library/urllib.html.
28483 bytes received from https://www.cnblogs.com/wangmo/p/7784867.html.

Process finished with exit code 0