python基于gevent实现并发下载器代码实例

这篇文章主要介绍了python基于gevent实现并发下载器代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

并发下载原理

import gevent
from gevent import monkey
import urllib.request
monkey.patch_all()
def my_download(url):
   print('GET: ％s' ％ url)
   resp = urllib.request.urlopen(url)
   data = resp.read()
   print('％d bytes received from ％s.' ％ (len(data), url))
gevent.joinall([
   gevent.spawn(my_download, "https://www.baidu.com"),
   gevent.spawn(my_download, "https://www.cnblogs.com"),
   gevent.spawn(my_download, "https://www.huya.com")

])

运行结果：

GET: https://www.baidu.com
GET: https://www.cnblogs.com
GET: https://www.huya.com
227 bytes received from https://www.baidu.com.
46411 bytes received from https://www.cnblogs.com.
353563 bytes received from https://www.huya.com.

实现多张图片同时下载

import gevent
from gevent import monkey
import urllib.request

monkey.patch_all()

def my_download(url, image_path):
 print('GET: ％s' ％ url)
 resp = urllib.request.urlopen(url)
 data = resp.read()
 print('％d bytes received from ％s.' ％ (len(data), url))

with open(image_path, "wb") as f:
   f.write(data)
gevent.joinall([
 gevent.spawn(my_download, "https://huyaimg.msstatic.com/cdnimage/anchorpost/1099/4c/73ff3e6ce165fb658b2082d4d126c6_2168_1544414129.jpg", "1.jpg"),
 gevent.spawn(my_download, "https://huyaimg.msstatic.com/cdnimage/anchorpost/1020/03/7949816c55f45b9adc9f03d9330af3_2168_1542941499.jpg", "2.jpg"),
 gevent.spawn(my_download, "https://huyaimg.msstatic.com/cdnimage/anchorpost/1061/55/8071537fa10120c43c5a1359a88530_2168_1545302709.jpg", "3.jpg"),
])

来源：https://www.cnblogs.com/zhangfengxian/p/10163655.html