Matthias Kaeppler wrote:
> class Base:
> def foo(self): # I'd like to say that children must implement foo
> pass
def foo(self):
raise NotImplementedError("Subclasses must implement foo")
Now calling foo on a child instance will fail if it hasn't implemented foo.
> And how do I formulate polymorphism in Python? Example:
>
> class D1(Base):
> def foo(self):
> print "D1"
>
> class D2(Base):
> def foo(self):
> print "D2"
> obj = Base() # I want a base class reference which is polymorphic
> if (<need D1>):
> obj = D1()
> else:
> obj = D2()
I have no idea what you're trying to do here and how it relates to
polymorphism.
--
Brian Beck
Adventurer of the First Order
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