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"),
])

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