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

Georg Brandl g.brandl at gmx.net
Fri Jul 9 19:34:05 CEST 2010

Am 09.07.2010 18:36, schrieb Eric Smith:

On 7/9/10 10:40 AM, Mark Dickinson wrote:

While looking at a parser module issue (http://bugs.python.org/issue9154) I noticed that Python's grammar doesn't permit trailing commas after keyword-only args. That is,

def f(a, b,): pass is valid syntax, while def f(*, a, b,): pass is not. I was just curious whether the latter was deliberate or an oversight. And if an oversight, is it worth fixing after the moratorium expires? (See also http://bugs.python.org/issue2009.) I use trailing commas all the time in argument lists. I don't use keyword-only args much, but I will when I switch to 3.x. I'd like to see this fixed. I'd argue it's a bug fix, but that's me.

+1

Georg

-- Thus spake the Lord: Thou shalt indent with four spaces. No more, no less. Four shall be the number of spaces thou shalt indent, and the number of thy indenting shall be four. Eight shalt thou not indent, nor either indent thou two, excepting that thou then proceed to four. Tabs are right out.

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