Pretty please: Named arguments

[spir]

On 02/28/2011 08:32 AM, Russel Winder wrote:
>> Thoughts?
> The Python mechanism relies on the fact that despatch is by name and not
> by signature.  Languages that dispatch by signature will have
> significantly greater problems!

The Python system also has a weak point: confusion of 'optional' and 'default' 
notions. These are 2 orthogonal aspects python forces you to mess up. There are 
optional args with no default values, and mandatory ones with defaults.
If you want to define an optional arg, python wants you to "invent" a fake 
default value. This is bad --even more in that it tends to load 'None'(common 
choice for fake value)  with application semantics.

Denis
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