Python开发中时长遇到要下载文件的情况，最常用的方法就是通过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。
下面来看看三种方法是如何来下载zip文件的：
方法一：
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import
urllib
import
urllib2
import
requests
print
"downloading with urllib"
url
=
'http://www.pythontab.com/test/demo.zip'
print
"downloading with urllib"
urllib.urlretrieve(url,
"demo.zip"
)
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方法二：
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import
urllib2
print
"downloading with urllib2"
url
=
'http://www.pythontab.com/test/demo.zip'
f
=
urllib2.urlopen(url)
data
=
f.read()
with
open
(
"demo2.zip"
,
"wb"
) as code:
code.write(data)
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方法三：
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import
requests
print
"downloading with requests"
url
=
'http://www.pythontab.com/test/demo.zip'
r
=
requests.get(url)
with
open
(
"demo3.zip"
,
"wb"
) as code:
code.write(r.content)
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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("demo2.zip", "wb") as code:
code.write(f.read())