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Showing content from http://mail.python.org/pipermail/python-dev/2010-June/100898.html below:

[Python-Dev] UserDict in 2.7

[Python-Dev] UserDict in 2.7 [Python-Dev] UserDict in 2.7Laurens Van Houtven lvh at laurensvh.be
Tue Jun 22 15:23:36 CEST 2010
On Tue, Jun 22, 2010 at 2:40 PM, Fred Drake <fdrake at acm.org> wrote:
> On Tue, Jun 22, 2010 at 2:21 AM, Raymond Hettinger
> <raymond.hettinger at gmail.com> wrote:
>> I had thought there was a conscious decision to not change any existing
>> classes from old-style to new-style.
>
> I thought so as well.  Changing any class from old-style to new-style
> risks breaking applications in obscure & mysterious ways.  (Yes, we've
> been bitten by this before; it's a real problem.)
>
>
>  -Fred

+1. I've been bitten by this more than once in some of the more
obscure old(-style) classes in twisted.python.

Laurens
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