title: how to python-oauth2
body: <p>I install python-oauth2 with <code>pip install oauth2</code> and I find the dir named 'oauth2' in <code>/usr/lib/python2.7/dist-packages</code>
  But <code>from pyoauth2 import Client,AccessToken</code> say: no moudles named pyoauth2
  Then, I changed <code>pyoauth2</code> to <code>oauth2</code>, same status.
  I download the source code from <a href="https://github.com/douban/douban-client" rel="nofollow">https://github.com/douban/douban-client</a></p>