[Python-ideas] Re: Decorators for class non function properties

Maybe I’m lacking context, but I don’t understand the proposal. Can you explain the semantics and syntax you have in mind in more detail? How do you get from the first example (@my_property etc.) to the second (def name, def set_name)?

—Guido

On Thu, Aug 6, 2020 at 01:13 redradist@gmail.com wrote:

I think a property decorator can be useful, because you consider the simplest case with:

class MyClass:
    @my_property
    name = arg

but consider it can generate the following code:

class MyClass:
    def name(self):
        ...

     def see_name(self):
        ...

Or consider the following example:

class MyClass:
    @factory
    strategy= arg

that can will generate:

class MyClass:
    class MyClassStrategy:
        ...

    strategy= MyClassStrategy(arg)

All it will be possible if attribute decorator will have the following signature:

def factory(name, value, self, cls):
    # Where name - name of the property
    #            value - initial value of the property
    #            self - instance of created object before call __init__
    #            cls - class object (MyClass)
    ...

of course some of properties could be omitted like this:

def factory(name, value, cls):
    # Where name - name of the property
    #            value - initial value of the property
    #            cls - class object (MyClass)
    ...

As you can see property decorators could be very powerful thing if it will done right ;) _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-leave@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/MCQBK7... Code of Conduct: http://python.org/psf/codeofconduct/