Avoid removing whitespace for walrus operators within subscripts #3823
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Description
At present, Black removes spaces around walrus operators within subscripts. For example, this is stable style:
While rare in practice, it appears that this behavior is unintentional, and falls out from Black's removal of spaces around colons in slices (e.g.,
x[y:z]
).This PR removes that behavior, instead requiring spaces around walrus operators in such cases.
Closes #3820.
Checklist - did you ...
CHANGES.md
if necessary?