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python isinstance 用法:
isinstance(object, classinfo)
判断实例是否是这个类或者object的变量
其中classinfo 是基础类型,包含tuple,dict,int,float,basestring,判断变量是否是这个类型
tuple,dict,int,float,basestring
isinstance(lst, (int, str, list) )
判断变量是否为类型表中的类型
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