[Python-Dev] A grammatical oddity: trailing commas in argument lists -- continuation

[Michael Foord]

On 13/12/2010 13:25, Nick Coghlan wrote:
> On Mon, Dec 13, 2010 at 9:44 PM, Jan Kaliszewski<zuo at chopin.edu.pl>  wrote:
>> I think that seeing that:
>>
>>     def f(a, b): ...
>>     def f(a, *, b): ...
>>     def f(a, *args, b): ...
>>     x(1, 2, 3, 4, z=5)
>>     x(1, *(2,3,4), z=5)
> As per the closure of the affected tickets, the likely outcome of such
> a discussion would be the deprecation and subsequent removal of
> support for the following two options:
>
>      def f(a, b,): ...
>      x(1, 2, 3, 4, z=5,): ...
>
> Function arguments are not lists. Even when separated onto multiple
> lines, the closing "):" should remain on the final line with other
> content.

Why?

For very long signatures I still mildly prefer this:

def f(self, first, second, third, fourth,
foo=None, bar=None, baz=None,
spam=None, eggs=None, ham=None
):

Over putting the closing paren: on the last line of the def.

Of course not having such long signatures is even more preferable, but 
*sometimes* they are needed.

All the best,

Michael Foord
> That would be a lot of hassle to get rid of something that people
> probably aren't doing in the first place, though.
>
> Regards,
> Nick.
>


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