Following PEP 667, https://docs.python.org/dev/reference/datamodel.html#frame-objects mentions that frame.f_locals may be a write-through proxy object, but doesn't really explain what that means.
Once python/peps#3845 lands PEP 667 will contain such a description, but the main docs should at least cover the key behaviours:
- new instance on every attribute access
- two proxies with the same keys and values will still be unequal if they refer to different frames
- extra keys can be stored and are stored on the frame itself so they're shared across all proxies for the same frame
- keys corresponding to local variables can't be deleted
.copy() (and any other API that produces a new container) returns a regular dict instance
Suggested location would be as a new 4th subsection under the frame objects section linked above. A "see also" from that new subsection back to PEP 667 would also be a useful addition.
Linked PRs
Following PEP 667, https://docs.python.org/dev/reference/datamodel.html#frame-objects mentions that
frame.f_localsmay be a write-through proxy object, but doesn't really explain what that means.Once python/peps#3845 lands PEP 667 will contain such a description, but the main docs should at least cover the key behaviours:
.copy()(and any other API that produces a new container) returns a regulardictinstanceSuggested location would be as a new 4th subsection under the frame objects section linked above. A "see also" from that new subsection back to PEP 667 would also be a useful addition.
Linked PRs