I've written a proof of concept patch to add a hook to PyDict_SetItem at
http://bugs.python.org/issue5654 My motivation is to enable
watchpoints in a python debugger that are called when an attribute or
global changes. I know that this won't cover function locals and
objects with slots (as Martin pointed out).
We talked about this at the sprints and a few issues came up:
* Is this worth it for debugger watchpoint support? This is a feature
that probably wouldn't be used regularly but is extremely useful in some
situations.
* Would it be better to create a namespace dict subclass of dict, use it
for modules, classes, & instances, and only allow watches of the
subclass instances?
* To what extent should non-debugger code use the hook? At one end of
the spectrum, the hook could be made readily available for non-debug use
and at the other end, it could be documented as being debug only,
disabled in python -O, & not exposed in the stdlib to python code.
John
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