对于IPython版本3.1、4.x和5.x

%load_ext autoreload
%autoreload 2

然后，您的模块将默认 自动重新加载 。这是文档：

File:       ...my/python/path/lib/python2.7/site-packages/IPython/extensions/autoreload.py

Docstring:
``autoreload`` is an IPython extension that reloads modules
automatically before executing the line of code typed.

This makes for example the following workflow possible:

.. sourcecode:: ipython

   In [1]: %load_ext autoreload

   In [2]: %autoreload 2

   In [3]: from foo import some_function

   In [4]: some_function()
   Out[4]: 42

   In [5]: # open foo.py in an editor and change some_function to return 43

   In [6]: some_function()
   Out[6]: 43

The module was reloaded without reloading it explicitly, and the
object imported with ``from foo import ...`` was also updated.

有一个窍门：当您使用时 忘记 以上 所有 内容时ipython，请尝试：

import autoreload
?autoreload
# Then you get all the above