[Python-3000] Generic function PEP won't make it in time
Guido van Rossum
guido at python.org
Mon Apr 23 20:43:12 CEST 2007
On 4/23/07, Phillip J. Eby <pje at telecommunity.com> wrote:
> from overloading import overload, abstract
> def foo(bar, baz):
> """Default implementation here"""
> def foo(bar:int, baz:str):
> """Overloaded implementation for int/str here"""
> def spam(fizz):
> """This function has no default implementation, and raises
> a "no applicable methods" error if called..."""
(a) What's the point of having a separate keyword for this, as opposed
to just raising an exception from the body?
(b) I'm proposing an @abstractmethod, which sets its argument's
__isabstractmethod__ attribute and then returns it, otherwise
unchanged. Would this be good enough for you, or do you need @abstract
to do more? My point is, I could rename mine to @abstract so that it
would serve your purpose as well -- but only if it would serve.
> def spam(fizz:list):
> """...unless an appropriate overload is added first"""
> Any questions? :)
I'd like the examples even better if they used ABCs from PEP 3119. :-)
--Guido van Rossum (home page: http://www.python.org/~guido/)
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