[Patches] UserDict/UserList: raise TypeError when trying to set attrs

[Fredrik Lundh]

Gerrit Holl wrote:
> I don't know why one would do that but...

afaik, the whole idea behind UserDict and UserList
is to support subclassing:

http://www.python.org/doc/current/lib/module-UserDict.html
http://www.python.org/doc/current/lib/module-UserList.html

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