On Tue, Apr 21, 2015 at 8:31 PM, Larry Hastings <la...@hastings.org> wrote: > > 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.
Actually, I wrote "accept=+{NoneType}" - note the plus is *after* the equal sign. This is a valid Python assignment expression. (The unary addition operator is not defined for sets, however.) - Tal Einat _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com