refering to base classes

[Bruno Desthuilliers]

glenn wrote:
> hi - Im quite new to python, wondering if anyone can help me understand
> something about inheritance here. In this trivial example, how could I
> modify the voice method of 'dog' to  call the base class 'creatures'
> voice method from with in it?
> 
> class creature:
>     def __init__(self):
>         self.noise=""
>     def voice(self):
>         return "voice:" + self.noise
>
> class dog(creature):
>     def __init__(self):
>         self.noise="bark"
>
>     def voice(self):
>             print "brace your self:"


<ot>
It might be better to use newstyle classes if you can. Also, the
convention is to use CamelCase for classes names (unless you have a
strong reason to do otherwise).
</ot>

Here you could use a class attribute to provide a default:

class Creature(object):
  noise = ""

  def voice(self):
    return "voice:" + self.noise


class Dog(Creature):
  noise="bark"

  def voice(self):
    print "brace your self:"
    return Creature.voice(self)
    # can also use this instead, cf the Fine Manual
    return super(Dog, self).voice()

My 2 cents
-- 
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'onurb at xiludom.gro'.split('@')])"