三种Python下载url并保存文件的代码

Python中下载url最流行的方法就是通过Http利用urllib或者urllib2模块。当然你也可以利用ftplib从ftp站点下载文件。此外Python还提供了另外一种方法requests。来看看三种方法是如何来下载zip文件的：

import urllib 
import urllib2 
import requests   
url = 'http://www.blog.pythonlibrary.org/wp-content/uploads/2012/06/wxDbViewer.zip'  
print "downloading with urllib"
urllib.urlretrieve(url, "code.zip")   

print "downloading with urllib2"
f = urllib2.urlopen(url) 
data = f.read() 
with open("code2.zip", "wb") as code:     
    code.write(data)   

print "downloading with requests"
r = requests.get(url) 
with open("code3.zip", "wb") as code:
     code.write(r.content)

看起来使用urllib最为简单，一句语句即可。当然你可以把urllib2缩写成：

f = urllib2.urlopen(url) 
with open("code2.zip", "wb") as code:
   code.write(f.read())