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From: Peter Otten <__peter__@web.de>
Newsgroups: comp.lang.python
Subject: Re: UserList - which methods needs to be overriden?
Date: Fri, 10 Jun 2016 10:37:05 +0200
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Nagy László Zsolt wrote:

> I'm not sure wich one is the best. Peter wrote that UserList was left in
> collections only for backward compatiblity. This might be a point

I'll take that back. I looked around and found no evidence for my claim. 
Only MutableString was removed during the transition to Python 3. 

Sorry for the confusion.