replace mothod for only one object but not for a class

[hofer]

Hi,

I have multiple objects all belonging to the same class
 (which I didn't implement and whose code I don't want to modify)

Now I'd like to change one method for one object only (after it has
been created) without adding any overhead
to the call of the other object's methods.


Is this possible?

Example
##### This is NOT what I'd like to do
##### as it overwrites the method for all objects of this class
o1 = aclass()
o2 = aclass()
# call original method
o1.method()
o2.method()
# overwrite the method for the entire class
aclass.method = mymethod
o1.method() # now new method
o2.method() # now new method


####### What doesn't work, but what I'd like to do
o1 = aclass()
o2 = aclass()
# call original method
o1.method()
o2.method()
# overwrite the method for the entire class
o1.method = mymethod
o1.method() # now new method
o2.method() # still old method


thanks for any pointers.


P.S. I guess, that there is a computer science term for what I try to
achieve.
If anybody knew it I would be interested to learn it as well.