On Thu, Jul 29, 2010 at 6:34 PM, Anand Balachandran Pillai <
abpil...@gmail.com> wrote:
> On Thu, Jul 29, 2010 at 5:33 PM, Mahadevan R <mdevan.foo...@gmail.com
> >wrote:
>
> > On Thu, Jul 29, 2010 at 4:24 PM, Nitin Kumar <nitin.n...@gmail.com>
> wrote:
> > > fine, but isn't there any way to hide few function of base class into
> > > derived one???
> >
> > You can try obscuring it:
> >
> > class y(x):
> > def __init__(self):
> > x.__init__(self)
> > self.A = None
> >
>
> Trying to do something like this in Python shows a mistake
> in the design of your classes. There are different ways to
> do this in Python. Here are a few.
>
> 1. Prefix the function with double underscore ('__')
> as steve said in his email.
>
I echo the same sentiments as Anand and Steve. If your class inherits from
something, its assumed the child class is of the same `kind` as the parent.
What you're asking sounds like this,
I have a `Vehicle` class which can `drive()`, now I wanna subclass `Car`,
but my `Car` doesnt implement `drive()` method.
Having said that, I'll add another method to restrict access to this
odd-function using __getattribute__.
What is __getattribute__ ?
Whenever you do access an attribute, be it for a function or an attribute
(like obj.foo() or obj.value), obj.__getattribute__ is called. Things are
really a little more involved than the simple explanation I wrote, but for
this case you just need to know that much.
class Parent(object):
def childShouldntCallMe(self):
doParentStuff()
class Child(Parent):
def __getattribute__(self, name):
if name == "childShouldntCallMe":
raise RestrictedAccessError # This could be a more polite
NotImplementedError
else:
return super(Child, self).__getattribute__(name)
/jeff
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