[Tutor] inquiry

[zxjhust1]

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Dear tutors:
       I have some questions about memory mechanism of python. Do the elements of the parent go into the namespace of the subclass when we define subclass?
 
As far as I'm concerned, they do go into the namespace of the subclass. Because when we use dir(), we can see all the elements. But there is only one 'update' name. I think the function of the subclass override the parent's.  In this situation , when we instantiate the subclass, we just need one argument, that is to say, the parent's update function do the work. It confuses me. 
According to my understanding, as there is no 'super' key word, the 'self' should inference to the instance of the subclass when we initiate the subclass. So self.__update should inference to function of the subclass.
Another quesion is about the meaning of the private variables. What condition shall we use them? In other word, I wanna know the purpose of introducing the private variables. The above-mentioned example, I think, is not enough to explain it, because when we change the __update to update, there is no change except for using update rather than _Mapping__update to inference it.
The last question is about the storage of the data. For a given data, like 1 or '1', what's the form when python saves it in the memory? To be more specific, I wanna know the number of the parts we use to enclose it. For example, python uses 3 parts to save it. One is for the value. The second for the type of the data, ie, inter,str,etc. The last is for the pointer or id to show the place  where it is stored.
Hope to hear from you soon. Have a good weekend!
Yours, sincerely.


Phoenix










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