getattr(object, name[, default]) -> value
Get a named attribute from an object; getattr(x, 'y') is equivalent to x.y.
When a default argument is given, it is returned when the attribute doesn't
exist; without it, an exception is raised in that case
转载于:https://www.cnblogs.com/seasonsstory/archive/2013/05/24/3097302.html
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