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

Cameron Simpson cs at zip.com.au
Mon Dec 13 22:06:50 CET 2010

On 13Dec2010 20:17, Antoine Pitrou <solipsis at pitrou.net> 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 again. Both the special cases and probably an example of diff friendliness:

x = f(a, b=3, ##c=4, hacking at dev time d=5)

Cheers,

Cameron Simpson <cs at zip.com.au> DoD#743 http://www.cskk.ezoshosting.com/cs/

A Master is someone who started before you did. - Gary Zukav

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