deprecate UserList? (WAS: Why no list heritable type?)

Steven Bethard steven.bethard at
Fri Dec 17 18:36:27 CET 2004

Sion Arrowsmith wrote:
> In article <86vfb13jpl.fsf at>, Mike Meyer  <mwm at> wrote:
>>And before Python 2.2 there was the UserList class in the standard
>>library. Which is still there in 2.4. Shouldn't it be depreciated by
>>this point?
> Apart from compatibility issues as mentioned in the UserList
> documentation, deriving from it will give you a classic class,
> whereas deriving from list will give you a new style class.
> There may be circumstances under which this is important
> (exercise left to more twisted minds than mine). Same applies
> to dict/UserDict.

Classic classes will eventually disappear:

GvR also encourages people to use new-style classes for everything:


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