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Thu Jan 16 07:28:57 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-January/131677.html

On 01/15/2014 10:21 PM, Georg Brandl wrote:
> Am 16.01.2014 05:35, schrieb Ryan Smith-Roberts:
>> On Wed, Jan 15, 2014 at 7:57 PM, Ryan Smith-Roberts <rmsr at lab.net
>> <mailto:rmsr at lab.net>> wrote:
>>
>>      socket.getservbyname(servicename[, protocolname])
>>      ->
>>      socket.getservbyname(servicename, protocolname=None)
>>
>>
>> Here is a more complicated example, since the above does technically have an
>> alternative fix:
>>
>> sockobj.sendmsg(buffers[, ancdata[, flags[, address]]])
>> ->
>> sockobj.sendmsg(buffers, ancdata=None, flags=0, address=None)
> As far as I understand you should convert these with the "optional group" syntax
> (i.e. brackets).

That's correct.  Functions that use PyArg_ParseTuple should continue to 
use PyArg_ParseTuple.  Ryan: add a "/" on a line by itself after the 
last parameter of each of these functions, and that will let you use the 
[ ] syntax too.  Please see the Argument Clinic howto for more.

//arry/
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[Python-Dev] AC Derby and accepting None for optional positional arguments