【python】如何下载一个网页

Stackoverflow的答案：
http://stackoverflow.com/questions/22676/how-do-i-download-a-file-over-http-using-python

import urllib2
response = urllib2.urlopen('http://www.example.com/')
html = response.read()

import urllib
urllib.urlretrieve ("http://www.example.com/songs/mp3.mp3", "mp3.mp3")

还有如progress bar的实现等等。
2012的requests，对http直接封装：

>>> import requests
>>> 
>>> url = "http://download.thinkbroadband.com/10MB.zip"
>>> r = requests.get(url)
>>> print len(r.content)
10485760

各类回答棒极了