Raymond Hettinger <rhettin...@users.sourceforge.net> added the comment:

I concur with Terry.
This is just a fact of life when subclassing builtins.
The objects are "open-for-extension, closed-for-modification".
If you want more direct control use UserDict.

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nosy: +rhettinger

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<http://bugs.python.org/issue1730480>
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