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Tue Apr 21 19:31:39 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-April/139316.html

On 04/21/2015 04:50 AM, Tal Einat wrote:
> As for the default set of accepted types for various convertors, if we
> could choose any syntax we liked, something like "accept=+{NoneType}"
> would be much better IMO.

In theory Argument Clinic could use any syntax it likes.  In practice, 
under the covers we tease out one or two bits of non-Python syntax, then 
run ast.parse over it.  Saved us a lot of work.

"s: accept={str,NoneType}" is a legal Python parameter declaration; "s: 
accept+={NoneType}" is not.  If I could figure out a clean way to hack 
in support for += I'll support it.  Otherwise you'll be forced to spell 
it out.

//arry/
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[Python-Dev] Surely "nullable" is a reasonable name?