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python基于gevent实现并发下载器代码实例

yipeiwu_com7年前 (2020-03-06)Python基础

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, "/zb_users/upload/202003/2cdcuskagnz.jpg", "1.jpg"),
  gevent.spawn(my_download, "/zb_users/upload/202003/apzvetxpnkr.jpg", "2.jpg"), 
  gevent.spawn(my_download, "/zb_users/upload/202003/j5xop3g4v3x.jpg", "3.jpg"),
])

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持【听图阁-专注于Python设计】。