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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
Python expressions surrounded by parentheses, with a few exceptions.
An empty expression is not allowed, and a :keyword:`lambda` expression
must be surrounded by explicit parentheses. Replacement expressions
can contain line breaks (e.g. in triple-quoted strings), but they
cannot contain comments. Each expression is evaluated in the context
where the formatted string literal appears, in order from left to right.
An empty expression is not allowed, and both :keyword:`lambda` and
assignment expressions ``:=`` must be surrounded by explicit parentheses.
Replacement expressions can contain line breaks (e.g. in triple-quoted
strings), but they cannot contain comments. Each expression is evaluated
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
is converted before formatting. Conversion ``'!s'`` calls :func:`str` on