diff options
Diffstat (limited to 'Doc/reference')
| -rw-r--r-- | Doc/reference/expressions.rst | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst index fb92ad0..151062b 100644 --- a/Doc/reference/expressions.rst +++ b/Doc/reference/expressions.rst @@ -196,8 +196,7 @@ they may depend on the values obtained from the leftmost iterable. For example: To ensure the comprehension always results in a container of the appropriate type, ``yield`` and ``yield from`` expressions are prohibited in the implicitly -nested scope (in Python 3.7, such expressions emit :exc:`DeprecationWarning` -when compiled, in Python 3.8+ they will emit :exc:`SyntaxError`). +nested scope. Since Python 3.6, in an :keyword:`async def` function, an :keyword:`async for` clause may be used to iterate over a :term:`asynchronous iterator`. @@ -214,8 +213,8 @@ See also :pep:`530`. .. versionadded:: 3.6 Asynchronous comprehensions were introduced. -.. deprecated:: 3.7 - ``yield`` and ``yield from`` deprecated in the implicitly nested scope. +.. versionchanged:: 3.8 + ``yield`` and ``yield from`` prohibited in the implicitly nested scope. .. _lists: @@ -350,9 +349,7 @@ The parentheses can be omitted on calls with only one argument. See section To avoid interfering with the expected operation of the generator expression itself, ``yield`` and ``yield from`` expressions are prohibited in the -implicitly defined generator (in Python 3.7, such expressions emit -:exc:`DeprecationWarning` when compiled, in Python 3.8+ they will emit -:exc:`SyntaxError`). +implicitly defined generator. If a generator expression contains either :keyword:`async for` clauses or :keyword:`await` expressions it is called an @@ -368,8 +365,8 @@ which is an asynchronous iterator (see :ref:`async-iterators`). only appear in :keyword:`async def` coroutines. Starting with 3.7, any function can use asynchronous generator expressions. -.. deprecated:: 3.7 - ``yield`` and ``yield from`` deprecated in the implicitly nested scope. +.. versionchanged:: 3.8 + ``yield`` and ``yield from`` prohibited in the implicitly nested scope. .. _yieldexpr: @@ -401,12 +398,10 @@ coroutine function to be an asynchronous generator. For example:: Due to their side effects on the containing scope, ``yield`` expressions are not permitted as part of the implicitly defined scopes used to -implement comprehensions and generator expressions (in Python 3.7, such -expressions emit :exc:`DeprecationWarning` when compiled, in Python 3.8+ -they will emit :exc:`SyntaxError`).. +implement comprehensions and generator expressions. -.. deprecated:: 3.7 - Yield expressions deprecated in the implicitly nested scopes used to +.. versionchanged:: 3.8 + Yield expressions prohibited in the implicitly nested scopes used to implement comprehensions and generator expressions. Generator functions are described below, while asynchronous generator |