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

Glenn Linderman v+python at g.nevcal.com
Mon Dec 13 20:26:44 CET 2010

On 12/13/2010 11:17 AM, 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.

+1. I tend to put them in, and then take out the ones that Python won't accept. Then, when I add another item to the list, Python tells me to go back and put the one I took out back in again, and take out the one I put in at the new end of the list. Annoying. (for vertically arranged lists, one per line, primarily, with ) on the last line by itself. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20101213/80c37037/attachment.html>

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