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bpo-36798: Updating f-string docs for := use case (GH-13107)

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Logan Jones 2019-05-06 12:32:44 -04:00 • committed by Guido van Rossum
parent f7b494c4d4
commit ae2c32f32b
1 changed files with 6 additions and 5 deletions
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11
Doc/reference/lexical_analysis.rst
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@ -680,11 +680,12 @@ with a closing curly bracket ``'}'``.
Expressions in formatted string literals are treated like regular Expressions in formatted string literals are treated like regular
Python expressions surrounded by parentheses, with a few exceptions. Python expressions surrounded by parentheses, with a few exceptions.
An empty expression is not allowed, and a :keyword:`lambda` expression An empty expression is not allowed, and both :keyword:`lambda` and
must be surrounded by explicit parentheses. Replacement expressions assignment expressions ``:=`` must be surrounded by explicit parentheses.
can contain line breaks (e.g. in triple-quoted strings), but they Replacement expressions can contain line breaks (e.g. in triple-quoted
cannot contain comments. Each expression is evaluated in the context strings), but they cannot contain comments. Each expression is evaluated
where the formatted string literal appears, in order from left to right. in the context where the formatted string literal appears, in order from
left to right.
If a conversion is specified, the result of evaluating the expression If a conversion is specified, the result of evaluating the expression
is converted before formatting. Conversion ``'!s'`` calls :func:`str` on is converted before formatting. Conversion ``'!s'`` calls :func:`str` on