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From: Terry Reedy <tjreedy@udel.edu>
Newsgroups: comp.lang.python
Subject: Re: Recommendation for Object-Oriented systems to study
Date: Mon, 30 May 2016 15:01:21 -0400
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On 5/30/2016 11:57 AM, Ankush Thakur wrote:
> On Monday, May 30, 2016 at 12:00:01 AM UTC+5:30, Terry Reedy wrote:

>>> Read the source code of the doctest module in the standard library.
>>
>> Or pick a module with classes that interests you, with the caveat that
>> some are old and crusty.  I learned from book and experience and learned
>> Python OO from stdlib modules.

> Okie . . . Any recommendations?

Beyond "pick a module with classes that interest you", I can suggest 
idlelib.help, which I helped to write.  If you ask, after reading it 
carefully, I will point out what I consider positive features.

-- 
Terry Jan Reedy