尝试开始使用Django。我的教程告诉我运行pip install dj-database-url。当我这样做时，我得到：
postgres@precise64:/vagrant/projects2/microblog$ pip install dj-database-url
Downloading/unpacking dj-database-url
Cannot fetch index base URL http://pypi.python.org/simple/ Could not find any downloads that satisfy the requirement dj-database-url
No distributions at all found for dj-database-url
Storing complete log in /var/lib/postgresql/.pip/pip.log
任何建议都将不胜感激！