This is a rather simplistic example, but you may be able to use a
mixin class to achieve what you need. The idea is that you write a
class that overrides only what is needed to add the new functionality.
For you it would be Color.
[code]
class Graph(object):
def _foo(self):
print "Graph._foo"
class Color(object):
def _foo(self):
print "Color._foo"
class Circle(Graph):
def bar(self):
self._foo()
class ColorCircle(Color,Circle): # the order of parent classes is
important
pass
if __name__ == "__main__":
c1 = Circle()
c2 = ColorCircle()
c1.bar() #prints: Graph._foo
c2.bar() #pritns: Color._foo
[/code]
You might not have to do anything already. Try this and see if it
works:
[code]
ColorCircle(ColorGraph,Circle):
pass
[/code]
Note that you will probably have to create an __init__ method, and
explicitly call the __init__ methods for the base classes. If the
__init__ for Circle ends up calling the __init__ method from Graph,
you may have issues. That is why the Color mixin that I created
inherited from object not Graph. It helps to avoid clashing __init__
methods.
Matt
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