Robert Dailey wrote:
Hey,
I have a class that I want to have a different base class depending on
a parameter that I pass to its __init__method. For example
(pseudocode):
class MyDerived( self.base ):
def __init__( self, base ):
self.base = base
Something like that... and then I would do this:
foo = MyDerived( MyBase() )
Note I'm using Python 3.1 on Windows. Thanks in advance.
Python makes it possible to change base classes, but that doesn't mean
it ever a good idea.
Moreover, the assignment is at the class level, not the instance level:
MyDerived.__bases__ = (base,) #A tuple of bases
would change the base class for the class MyDerived, and all instances
past, present, or future.
Better (but still not good) might be a factory function that derives a
class with the desired base class:
def Derive(base):
class Derived(base):
pass
return Derived
DerivedClass = Derive(MyBase)
foo = DerivedClass(...)
I believe that will produce what you were looking for.
Gary Herron
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