jiansong 91e098e0ea Avoid use xx=[] for parameter in function ...

Use xx = [] for the parameter for function, this parameter will
only be initialized at the first call, this is should be avoided.
Better choice is to set the initial value to None, then the initialization
time use xx= xx or []

more information:http://effbot.org/zone/default-values.htm

Change-Id: Icbade7dd4c7d231ae65fd4f8de673b484bab721c

2016-10-19 02:08:46 +00:00

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