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

Terry Reedy tjreedy at udel.edu
Mon Dec 13 22:21:20 CET 2010

On 12/13/2010 2:17 PM, Antoine Pitrou wrote:

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.

Same here. A strong +1 for a consistent rule (always or never allowed) with a +1 for always given others use case of one param/arg per line.

So I think the issues should be reopened.

-- Terry Jan Reedy

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