[Python-Dev] PEP 416: Add a frozendict builtin type

[Victor Stinner]

> On the other hand, exposing the existing read-only dict proxy as a
> built-in type sounds good to me.  (It would need to be changed to
> allow calling the constructor.)

I wrote a small patch to implement this request:
http://bugs.python.org/issue14386

I also opened the following issue to support other types than dict for
__builtins__:
http://bugs.python.org/issue14385

This issue is directly related to pysandbox, but it may help other purpose.

Victor