python is not None
2013-08-21 23:14
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python 判空常用 XX is not None，但其实 not XX is None 也可以。
http://stackoverflow.com/questions/2710940/python-if-x-is-not-none-or-if-not-x-is-none
http://stackoverflow.com/questions/2710940/python-if-x-is-not-none-or-if-not-x-is-none
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