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Tue Jul 28 13:29:54 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-July/090910.html

Nick Coghlan wrote:
> One specific example I can think of is that object.__hash__ is special
> cased in a few places due to the way its definition interacts with the
> definition of comparison operations. Allowing changes to the contents of
> object's tp_hash slot could lead to much weirdness when it came to
> __hash__ inheritance.

Just thought of a much better example as I clicked send: the basic
numeric types (especially int) are locked down because they are
special-cased all over the place (including in the main interpreter eval
loop) in order to speed up simple arithmetic.

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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[Python-Dev] Py_TPFLAGS_HEAPTYPE too overloaded