The reload built-in function has been moved to importlib module in Python 3.4
from importlib import reload
参考：
http://blog.csdn.net/leexide/article/details/39908279
http://www.cnblogs.com/feeland/p/4401758.html
http://blog.sina.com.cn/s/blog_615c388d01017b5o.html
http://codingnow.cn/language/265.html
http://blog.csdn.net/five3/article/details/7762870
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