Re: del_, delete_, and properties

Mark Hahn wrote:

Some corrections on the properties examples...

> FYI:  The property scheme I am implementing is:
>
>     # normal do-nothing property x
>     object Proto1:
>             x_ = DEFAULT
>             def init_():
>                     blah blah blah
>             prop x:                     # same as object x(Prop):
>                     def get_():
>                             return self.x_
>                     def set_(val):
>                             self.x_ = val
>                     def del_(): raise OperationError
>
> obj = Proto1

obj = Proto1()

> y = obj.x   #  replaced with:  y = obj.x.get_{obj}()
> obj.x = y   #  replaced with:  obj.x.set_{obj}( y )
> del obj.x   #  replaced with:  obj.x.del_{obj}()
> obj.attrs_['x']          # not replaced
> obj.attrs_['x'] = y    # not replaced
> del obj.attrs_['x']    # not replaced
>
>     # wild-card properties (like __getattribute__)
>     object Proto1:
>             def get_():
>                     print "you'll get nothing and like it"
>             def set_(): pass
>             def del_(): pass

These wild-card method definitions need formal params like the name of the
attribute.

            def get_(name):
                     print "you'll get nothing and like it"
             def set_(name, val): pass
             def del_(name): pass

> p = Proto1()
> x = p.anything
> you'll get nothing and like it
> print x
> None
> p.asdf = 37
> x = p.asdf
> you'll get nothing and like it