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Tue Feb 28 02:20:34 CET 2012 · https://mail.python.org/pipermail/python-dev/2012-February/117020.html

Nick Coghlan <ncoghlan <at> gmail.com> writes:

> I'm pretty sure the PyPy jit can already pick up and optimise cases
> where a dict goes "read-only" (i.e. stops being modified).

No, it doesn't. We handle cases like a type's dict, or a module's dict,
by having them use a different internal implementation (while, of course,
still being dicts at the Python level). We do *not* handle the case of
trying to figure out whether a Python object is immutable in any way.

Alex

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[Python-Dev] Add a frozendict builtin type