import gevent
import time
from gevent import monkey
# 这是一个补丁,代码中有耗时操作,换为gevent中自己实现的模块
monkey.patch_all()
def f(n):
for i in range(n):
print('---%d---' % i)
time.sleep(0.5)
# gevent.joinall()实现多个协程同时工作,内部是一个列表。gevent.spawn()生成一个协程对象,供joinall协程使用
gevent.joinall([gevent.spawn(f,5),gevent.spawn(f,10)])
import urllib.request
import gevent
from gevent import monkey
monkey.patch_all()
def mydownload(img_name,img_url):
response = urllib.request.urlopen(img_url)
content = response.read()
with open(img_name,'wb') as fp:
fp.write(content)
def main():
gevent.joinall([gevent.spawn(mydownload, "1.jpg", "http://pic.topmeizi.com/wp-content/uploads/2017a/04/08/01.jpg"),
gevent.spawn(mydownload, '2.jpg', 'http://pic.topmeizi.com/wp-content/uploads/2017a/04/07/01.jpg')])