On 2016-11-03 18:36, Chris Barker wrote:
Thanks Steven, this is great!

so -- when all this started, I think one of the use cases was to clean
up this really common idiom:

self.an_arg = the_default if an_arg is None else an_arg

so would that be:

self.an_arg = the_default ?? an_arg

That would be nice.

Though the fact that I'm still not sure if that's correct makes me think
this is not so intuitive!

No, ?? is a bit like 'or', except that only None is falsey, so it would be:

    self.an_arg = an_arg ?? the_default

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