python自省#

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#自省就是python能够在程序运行时知道对象的的类型
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a=[1,2,3]
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print(type(a))
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print(dir(a))#dir用于显示出一个对象所有的属性，方法，变量！返回列表
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print(isinstance(a,list))#用于检测a是不是list的子类
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#输出
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<class 'list'>
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['__add__', '__class__', '__class_getitem__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getstate__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'clear', 'copy', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']
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True