forcing a definition to be called on attribute change

[Michael Malinowski]

Hey All, 
Apologies if this is a stupidly obvious or simple question. If I have a
class with a series of attributes, is there a way to run a function
definition in the class whenever a specific attribute is changed?

Something like the following 

class cSphere() :
        
        def __init__(self):
                Self.myAttr = 0

        def runThisFunctionWhenMyAttrChanged() :
                Pass




Thanks

Mike.

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