Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:
[Serhiy]
> In particularly it allows to modify __dict__ of builtin types.
This doesn't look like something that would happen accidentally. We've never
had any bug reports about this occurring in the wild.
[GvR]
> Maybe we should not fix this then?
That seems reasonable. In general, it is hard to completely wall-off instances
against deliberate efforts to pry them open:
>>> from types import MappingProxyType
>>> import gc
>>> orig = {1: 2}
>>> proxy = MappingProxyType(orig)
>>> refs = gc.get_referents(proxy)
>>> refs
[{1: 2}]
>>> refs[0][1] = 3
>>> orig
{1: 3}
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43838>
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