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Code Issues Projects Releases Packages Wiki Activity Actions 9

bpo-32012: Disallow trailing comma after genexpr without parenthesis. (#4382)

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Serhiy Storchaka 2017-11-15 08:49:40 +02:00 • committed by GitHub
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Doc/whatsnew/3.7.rst
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@ -630,6 +630,20 @@ This section lists previously described changes and other bugfixes
that may require changes to your code.
Changes in Python behavior
--------------------------
* Due to an oversight, earlier Python versions erroneously accepted the
following syntax::
f(1 for x in [1],)
Python 3.7 now correctly raises a :exc:`SyntaxError`, as a generator
expression always needs to be directly inside a set of parentheses
and cannot have a comma on either side.
(Contributed by Serhiy Storchaka in :issue:`32012`.)
Changes in the Python API
-------------------------