我已经在我的virtualenv中安装了ipython，所以python manage.py shell给了我的ipython。但是，我无法从函数定义中访问导入：
$ python manage.py shell
Python 2.7.5 (default, Sep 6 2013, 09:55:21)
Type "copyright", "credits" or "license" for more information.
IPython 1.1.0 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object', use 'object??' for extra details.
In [1]: from re import search
In [2]: def my_search(pattern, string):
return search(pattern, string)
...:
In [3]: my_search('x', 'y')
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
/home/wilfred/.envs/drawbridge/lib/python2.7/site-packages/django/core/management/commands/shell.pyc in <module>()
----> 1 my_search('x', 'y')
/home/wilfred/.envs/drawbridge/lib/python2.7/site-packages/django/core/management/commands/shell.pyc in my_search(pattern, string)
1 def my_search(pattern, string):
----> 2 return search(pattern, string)
3
NameError: global name 'search' is not defined
如果我直接启动ipython，这样可以正常工作。为什么它不能用于Django shell？