布林带
===============

This example is based on:
 * http://www.investopedia.com/articles/trading/07/bollinger.asp

.. literalinclude:: ../samples/bbands.py

本例输出结果如下:

.. literalinclude:: ../samples/bbands.output

最终结果绘制如下图所示:

.. image:: ../samples/bbands.png

You can get better returns by tunning the Bollinger Bands period as well as the entry and exit points.