Maric Michaud wrote:
> Le jeudi 07 septembre 2006 15:33, Steven Bethard a écrit :
>> Well, lambda's not going away[1],
>
> Sure, they won't.
>
>> but there's no *need* for lambda here.
>> It could be written as::
>
> Le jeudi 07 septembre 2006 17:16, George Sakkis a écrit :
>> Sure, it *could*; whether it *should* is a different issue. I can't
>> imagine a case for absolute *need* of lambda, but there are several
>> cases where it is probably the best way, such as the one of this
>> thread.
>
> I have no preferences here, I used lambdas because it's more compact but they
> have also their drawback, when the function get a little more complex the
> code is quickly confusing. The main advantage of the lambdas in this case is
> to not pollute the class namespace.
>
> Le jeudi 07 septembre 2006 23:48, Steven Bethard a écrit :
>> Try using one of the following recipies:
>>
>> http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/408713
>> http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/442418
>
> The code i wrote was to demonstrate late binding is usually not needed (and
> it's not the semantic of properties so it's a bit like "make Java in
> Python").
If you're really this uncomfortable with writing your own descriptors,
sure, you don't have to. But descriptors are an integral part of Python
-- new-style classes wouldn't have methods without them, nor could
classmethod or staticmethod have been defined. So defining a new
descriptor is far from un-Pythonic.
> If you really want late binding, the first recipe may be a solution, but it
> should be both simpler and should not introduce a new semantic (the functions
> passed as strings is disappointing).
If you want to use the functions instead of their names, it's as simple
as changing the __init__ to:
def __init__(self, fget=None, fset=None, fdel=None, doc=None):
self.getname = fget.__name__
self.setname = fset.__name__
self.delname = fdel.__name__
self.__doc__ = doc
Then you can use the same signature as property.
STeVe
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