PEP 649: Fix nested list formatting (#2856)

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Peter Law 2022-10-29 14:01:10 +01:00 committed by GitHub
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@ -199,9 +199,11 @@ them to their actual Python values. This has several drawbacks:
implementation.
* It requires that all annotations be evaluated at module-level
scope. Annotations under :pep:`563` can no longer refer to
* class variables,
* local variables in the current function, or
* local variables in enclosing functions.
* It requires a code change every time existing code uses an
annotation, to handle converting the stringized
annotation back into a useful value.
@ -224,10 +226,12 @@ This PEP also solves the forward reference problem outlined in
* Python implementations would generate annotations as code
objects. This is simpler than stringizing, and is something
Python implementations are already quite good at. This means:
- alternate implementations would need to write less code to
implement this feature, and
implement this feature, and
- the implementation would be simpler overall, which should
reduce its ongoing maintenance cost.
reduce its ongoing maintenance cost.
* Existing annotations would not need to be changed to only
use global scope. Actually, annotations would become much
easier to use, as they would now also handle forward