python - copying functions located in instances -

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Here's some code (simplified) for what I'm doing:

  class A: Pass square b: def printSelf (self):. Print self instOfA = one () instOfB = b () instOfA.printSelf = instOfB.printSelf instOfA.printSelf () of & lt; Main example_____ at 0x0295D238 & Example;  

When I'd call instOfA.printSelf (), it prints Being instOfB themselves
But I self instOfA when I instOfA.printSelf (), And instOfB when I call instOfB.printSelf ()
How do I go about defining the printSelf in square one without having to do this manually?

To think of those people why I would like to do something like this, here is a long example:

  Work as a template for # intense def setInput (Self, Val) :: I have many anInstances general rules, which are defined by an example of aDefinition class that class ADefinitionClass (although I would have many rules set too) checkInputByLength def self.inputStr = Val (manually ): Return Lane (self.inputStr) & lt; 5 def checkInputByCase (self): return self.inputStr == self.inputStr.upper () checkInput = checkInputByLength class aInstance (aDefinition): inputStr = "" def __init __ (self, ruleDefinition): self.checkInput = ruleDefinition.checkInput aDef = ADefinitionClass () aDef.checkInput = aDef.checkInputByCase # change the rules ainst = aInstance (aDef) aInst.setInput ( "ABC") aInst.checkInput () AttributeError: aDefinitionClass example has no properties 'inputStr'  

I know this is a bit unusual, but I can not think of a different way of doing this, I think effectively trying to subclass an example. This is something that has been shown in this way: Python allowed:

anInstance (aDef): inputStr = ""