Python开发爬虫常用库
   urllib
   urllib2
   Beautiful Soup
   http://www.crummy.com/software/BeautifulSoup/
   lxml
   http://lxml.de
   HTQL
   http://htql.net/
   Scrapy
   http://scrapy.org/
   Mechanize
   http://wwwsearch.sourceforge.net/mechanize/
   PyQuery
   http://pythonhosted.org/pyquery/index.html
   requests
   http://docs.python-requests.org/en/latest/
   selenium
   http://selenium-python.readthedocs.org/en/latest/


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