Defining class attributes + inheritance

[Santoso Wijaya]

Here's how you do inheritance:

C:\>python
Python 2.7.1 (r271:86832, Nov 27 2010, 17:19:03) [MSC v.1500 64 bit (AMD64)]
on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> class BaseClass(object):
... def __init__(self, a, b, c, d):
... self.a = a
... self.b = b
... self.c = c
... self.d = d
...
>>> class NewClass(BaseClass):
... def __init__(self, a, b, c, d, new):
... super(NewClass, self).__init__(a, b, c, d)
... self.new = new
...
>>> A = BaseClass(1,2,3,4)
>>> print A.a, A.b, A.c, A.d
1 2 3 4
>>> B = NewClass(1,2,3,4,5)
>>> print B.a, B.b, B.c, B.d, B.new
1 2 3 4 5
>>>

~/santa


On Tue, Mar 8, 2011 at 5:00 PM, Martin De Kauwe <mdekauwe at gmail.com> wrote:

> On Mar 9, 11:50 am, "Rhodri James" <rho... at wildebst.demon.co.uk>
> wrote:
> > On Wed, 09 Mar 2011 00:29:18 -0000, Martin De Kauwe <mdeka... at gmail.com>
>
> > wrote:
> >
> >
> >
> >
> >
> >
> >
> > > On Mar 9, 10:20 am, Ethan Furman <et... at stoneleaf.us> wrote:
> > [snip]
> > >> Just make sure and call the parent's constructor, either with
> >
> > >> class NewClass(BaseClass):
> > >>      def __init__(self, ....):
> > >>          BaseClass.__init__(self, other_params)
> >
> > >> or
> >
> > >> class NewClass(BaseClass):
> > >>      def __init__(self, ....):
> > >>          super(NewClass, self).__init__(....)
> >
> > >> ~Ethan~
> >
> > > Hi thanks, but I think I am implementing it wrong then?
> >
> > > BaseClass has 4 attributes and when I tried what you said
> >
> > > class NewClass(BaseClass):
> > >     def __init__(self):
> > >         super(NewClass, self).__init__(new_thing)
> >
> > > I get the error
> >
> > > TypeError: __init__() takes exactly 1 argument (6 given)
> >
> > Please give us either the rest of the code or the rest of the
> > traceback, or preferably both.  Without one or the other we have
> > little hope of guessing what you've typed.
> >
> > --
> > Rhodri James *-* Wildebeest Herder to the Masses
>
> OK
>
> class BaseClass(object):
>
>    def __init__(self, a, b, c, d):
>        self.a = a
>        self.b = b
>        self.c = c
>        self.d = d
>
>
> class NewClass(BaseClass):
>    def __init__(self):
>         super(NewClass, self).__init__(new)
>        self.new = new
>        print self.new
>
> class PreviousClass:
>    def __init__(self, a, b, c, d, new):
>        self.a = a
>        self.b = b
>        self.c = c
>        self.d = d
>        self.new = new
>        print self.new
>
>
> if __name__ == "__main__":
>
>    A = PreviousClass(1, 2, 3, 4, 5)
>    B = NewClass(1, 2, 3, 4, 5)
>
> $ python test.py
> Traceback (most recent call last):
>  File "model_data.py", line 29, in <module>
>    B = NewClass(1, 2, 3, 4, 5)
> TypeError: __init__() takes exactly 1 argument (6 given)
>
>
>
> So NewClass is my attempt to implement what I was shown and
> PreviousClass was how I was originally solving the issue, i.e. I
> wouldn't inherit the BaseClass.
>
> thanks
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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