将 django 项目部署到服务器后，访问 admin 时出现如下错误：
DoesNotExist at /admin/ Site matching query does not exist.
上网搜索后，参考 http://stackoverflow.com/questions/9736975/django-admin-doesnotexist-at-admin 修复了该问题，下面记录一下解决过程。
两种解决办法：
第一种办法是：编辑 settings.py 文件，从 INSTALLED_APPS 配置项中移除 'django.contrib.sites',。
第二种办法：通过 python manage.py shell 为 Site model 添加一条记录（将网站的域名添加进去）：
$ python manage ...错误信息如下：
You just installed Django's auth system, which means you don't have any superusers defined. Would you like to create one now? (yes/no): yes Traceback (most recent call last): File "manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/usr/local/lib/python2.7/dist-packages/django ...
想取得的效果是： [1, 2, 3, 4, 5, 6, 7] --> [[1, 2, 3], [4, 5, 6], [7]]
下面三种方法取自博文 http://sandrotosi.blogspot.com/2011/04/python-group-list-in-sub-lists-of-n.html 及评论。
def group_iter(iterator, n=2): """ Given an iterator, it returns sub-lists made of n items (except the last that can have len < n) inspired ...