8000 [3.8] bpo-39545: Document changes in the support of await in f-strings. (GH-18456) by miss-islington · Pull Request #18505 · python/cpython · GitHub
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[3.8] bpo-39545: Document changes in the support of await in f-strings. (GH-18456) #18505

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Merged
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Feb 14, 2020
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[3.8] bpo-39545: Document changes in the support of await in f-strings. (GH-18456) #18505

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5 changes: 5 additions & 0 deletions Doc/reference/lexical_analysis.rst
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Expand Up @@ -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
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
is converted before formatting. Conversion ``'!s'`` calls :func:`str` on
the result, ``'!r'`` calls :func:`repr`, and ``'!a'`` calls :func:`ascii`.
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5 changes: 5 additions & 0 deletions Doc/whatsnew/3.7.rst
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Expand Up @@ -493,6 +493,11 @@ of this mode.
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
now have more than 255 parameters. (Contributed by Serhiy Storchaka in
:issue:`12844` and :issue:`18896`.)
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