[Python-3000] parameter lists [was: Type Expressions]

[Ron Adam]

Greg Ewing wrote:
> Ron Adam wrote:
> 
>> Or just ...
>>
>>     def f(a, b, c=?, d=x):
> 
> But there's nothing about this that particularly
> suggests that c *must* be specified with a keyword.
> It looks like just another positional arg with a
> rather strange-looking default.

The strange default would after a while be easily recognized for what it 
is, "A missing value which needs to be replaced at call time", but Guido 
said there won't be a generic NULL.  So we can cross this one off.

This would have indicated required keywords that are also positional, 
but not indicate required keywords that are non-positional.  An actual 
syntax is needed for that instead of a Value placeholder.

Your single '*' syntax which Guido now prefers fills this need better. ;-)

Cheers,
    Ron