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gh-86482: Document assignment expression need for ()s #23291

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gh-86482: Document assignment expression need for ()s #23291

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bpo-42316: Document assignment expression need for ()s
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5 changes: 5 additions & 0 deletions Doc/reference/expressions.rst
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Expand Up @@ -1766,6 +1766,11 @@ Or, when processing a file stream in chunks:
while chunk := file.read(9000):
process(chunk)

Assignment expressions must be surrounded by parentheses when used
as sub-expressions in subscript, slicing, conditional, lambda,
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keyword-argument, generator, and comprehension-if expressions. They
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can only be used as is in if and while statements and in decorators.
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.. versionadded:: 3.8
See :pep:`572` for more details about assignment expressions.

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core and Builtins/2020-11-15-02-08-43.bpo-42316.LqdkWK.rst
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Document some places where an assignment expression needs parentheses.