[Python-Dev] A grammatical oddity: trailing commas in argument lists -- continuation (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Mon Dec 13 20:17:59 CET 2010

On Mon, 13 Dec 2010 14:09:02 -0500 Alexander Belopolsky <alexander.belopolsky at gmail.com> wrote:

On Mon, Dec 13, 2010 at 11:54 AM, Guido van Rossum <guido at python.org> wrote: > I'm at least +0 on > allowing trailing commas in the situation the OP mentioned. >

FWIW, I am also about +0.5 on allowing trailing comma. Note that in a similar situation, the C standardization committee has erred on the side of consistency: """ A new feature of C99: a common extension in many implementations allows a trailing comma after the list of enumeration constants. The Committee decided to adopt this feature as an innocuous extension that mirrors the trailing commas allowed in initializers. """ http://www.open-std.org/jtc1/sc22/wg14/www/C99RationaleV5.10.pdf Similarly, I find allowing trailing comma in keyword only arguments lists to be an innocuous extension that mirrors the trailing commas allowed in the positional arguments lists.

+1 from me as well. Special cases are hard to remember.

Regards

Antoine.

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