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Diffstat (limited to 'Doc/whatsnew')
| -rw-r--r-- | Doc/whatsnew/3.7.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Doc/whatsnew/3.7.rst b/Doc/whatsnew/3.7.rst index 6545a18..b6dad4e 100644 --- a/Doc/whatsnew/3.7.rst +++ b/Doc/whatsnew/3.7.rst @@ -570,6 +570,18 @@ Other CPython Implementation Changes Deprecated ========== +* Yield expressions (both ``yield`` and ``yield from`` clauses) are now deprecated + in comprehensions and generator expressions (aside from the iterable expression + in the leftmost :keyword:`for` clause). This ensures that comprehensions + always immediately return a container of the appropriate type (rather than + potentially returning a :term:`generator iterator` object), while generator + expressions won't attempt to interleave their implicit output with the output + from any explicit yield expressions. + + In Python 3.7, such expressions emit :exc:`DeprecationWarning` when compiled, + in Python 3.8+ they will emit :exc:`SyntaxError`. (Contributed by Serhiy + Storchaka in :issue:`10544`.) + - Function :c:func:`PySlice_GetIndicesEx` is deprecated and replaced with a macro if ``Py_LIMITED_API`` is not set or set to the value between ``0x03050400`` and ``0x03060000`` (not including) or ``0x03060100`` or |