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bpo-36798: Updating f-string docs for := use case. #13107

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May 6, 2019
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bpo-36798: Updating f-string docs for := use case. #13107

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11 changes: 6 additions & 5 deletions Doc/reference/lexical_analysis.rst
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Expand Up @@ -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
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