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bpo-39545: Document changes in the support of await in f-strings. (GH-18456)

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https://bugs.python.org/issue39545
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Serhiy Storchaka 2020-02-14 01:57:35 +02:00 • committed by GitHub
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5
Doc/reference/lexical_analysis.rst
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@ -685,6 +685,11 @@ strings), but they cannot contain comments. Each expression is evaluated
in the context where the formatted string literal appears, in order from in the context where the formatted string literal appears, in order from
left to right. left to right.
.. versionchanged:: 3.7
Prior to Python 3.7, an :keyword:`await` expression and comprehensions
containing an :keyword:`async for` clause were illegal in the expressions
in formatted string literals due to a problem with the implementation.
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
the result, ``'!r'`` calls :func:`repr`, and ``'!a'`` calls :func:`ascii`. the result, ``'!r'`` calls :func:`repr`, and ``'!a'`` calls :func:`ascii`.

5
Doc/whatsnew/3.7.rst
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@ -493,6 +493,11 @@ description.
Other Language Changes Other Language Changes
====================== ======================
* An :keyword:`await` expression and comprehensions containing an
:keyword:`async for` clause were illegal in the expressions in
:ref:`formatted string literals <f-strings>` due to a problem with the
implementation. In Python 3.7 this restriction was lifted.
* More than 255 arguments can now be passed to a function, and a function can * More than 255 arguments can now be passed to a function, and a function can
now have more than 255 parameters. (Contributed by Serhiy Storchaka in now have more than 255 parameters. (Contributed by Serhiy Storchaka in
:issue:`12844` and :issue:`18896`.) :issue:`12844` and :issue:`18896`.)