你可以用urllib.urlretrieve.
如有必要,将URL表示的网络对象复制到本地文件.
例:
>>> import urllib
>>> urllib.urlretrieve('http://i.imgur.com/Ph4Xw.jpg', 'duck.jpg')
('duck.jpg', <httplib.HTTPMessage instance at 0x10118e830>)
# by now the file should be downloaded to 'duck.jpg'
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