[Tutor] self.name is calling the __set__ method of another class

[Arup Rakshit]

On 30/04/19 5:11 AM, Steven D'Aprano wrote:
> On Tue, Apr 30, 2019 at 12:47:02AM +0530, Arup Rakshit wrote:
>
>> I really didn't write that code by myself. The day I'll you will not see
>> me here everyday :) . I was watching a PyCon video
>> https://youtu.be/81S01c9zytE?t=8172 where the author used this code. But
>> his explanation is not clear to me. The main problem is that the guy who
>> was recorded it far away from the projector, so what speaker were
>> showing there is not clear. So thought to ask here as usual. Because I
>> felt so lost with this trick.
> Okay, the short, SIMPLIFIED (and therefore inaccurate) summary of
> descriptors:
>
> Descriptors are the "magic" used by Python whenever it does an attribute
> lookup. When you do any sort of attribute lookup or assignment:
>
>      x = spam.eggs
>
>      spam.eggs = value
>
> Python looks at spam and spam's class for an attribute called "eggs",
> and if that attribute is an object with a __set__ or __get__ method, it
> calls that method:
>
>      x = spam.eggs
>      => x = spam.eggs.__get__()
>
>      spam.eggs = value
>      => spam.eggs.__set__(value)
>
> For the gory details of what *precisely* happens, see the Howto Guide:
>
> https://docs.python.org/3/howto/descriptor.html

All answers in the thread with the howto link above helped me to 
understand this at least. I did't masters yet, but atleast now can 
reason about what is going on when I meet such code examples.

>
>
> Python has a few common descriptors built in:
>
> - ordinary methods
> - classmethod
> - staticmethod
> - property
>
> Apart from staticmethod, they're all pretty common in code. But writing
> your own custom descriptors is fairly rare. I've only done it once, in
> 25+ years of using Python.
>
>
Thank you very much.

-- 
Thanks,

Arup Rakshit