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Sun Jan 25 03:10:51 CET 2015 · https://mail.python.org/pipermail/python-dev/2015-January/137877.html

To finish PEP 448, I need to update the grammar for syntax such as

{**x for x in it}

and

{1:2, 3:4, **a}

It's been a long time since I've looked at grammars and I could really use
the advice of an expert.  I'm considering replacing:

dictorsetmaker: ( (test ':' test (comp_for | (',' test ':' test)* [','])) |
                  (test (comp_for | (',' test)* [','])) )

with:

dictpopulator: test ':' test | '**' test
dictorsetmaker: ( (dictpopulator (comp_for | (',' dictpopulator)* [','])) |
                   (test (comp_for | (',' test)* [','])) )

Am I headed in the right direction?  Of course I will need to edit
parsermodule.c and ast.c.

Best,

Neil
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[Python-Dev] Any grammar experts?