Feature or enhancement

Proposal:

Per PEP 667,frame.f_locals is now a write-through proxy (FrameLocalsProxy) for underlying fast local variables. In the beginning we did not implement thecopy() method because we thinkdict(frame.f_locals) is a more explicit way to achieve the snapshot. However, there are existing code that's usingframe.f_locals.copy() to take a snapshot. Moreover,types.MappingProxyType({}).copy() returns the copy of the underlying mapping so it's not unprecedented for aproxy.copy() to return a dict.

Thus, we should implementcopy() method forFrameLocalsProxy and make it return a dict of snapshot of the current local variables.

Has this already been discussed elsewhere?

I have already discussed this feature proposal on Discourse

Links to previous discussion of this feature:

https://discuss.python.org/t/pep-667-consistent-views-of-namespaces/46631/26

Linked PRs

• gh-118921: Addcopy() method forFrameLocalsProxy #118923
• [3.13] gh-118921: Addcopy() method forFrameLocalsProxy (GH-118923) #118933