在 2012年8月30日星期四UTC+8下午7时54分35秒，Dave Angel写道： > On 08/30/2012 06:55 AM, 陈伟 wrote: > > > when i write code like this: > > > > > > class A(object): > > > > > > d = 'it is a doc.' > > > > > > > > > t = A() > > > > > > print t.__class__.d > > > print t.d > > > > > > the output is same. > > > > > > so it means class object's attribute is also the instance's attribute. is > > it right? i can not understand it. > > > > In your example, you have no instance attribute. So when you use the > > syntax to fetch one, the interpreter looks first at the instance, > > doesn't find it, then looks in the class, and does. That is documented > > behavior. Some people use it to provide a kind of default value for > > instances, which can be useful if most instances need the same value, > > but a few want to overrride it. > > > > -- > > > > DaveA thank you very much.
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