class X(Y)
Make a class named X that is-a Y.
class X(object): def __init__(self, J)
class X has-a __init__ that takes self and J parameters.
class X(object): def M(self, J)
class X has-a function named M that takes self and J parameters.
foo = X()
Set foo to an instance of class X.
foo.M(J)
From foo get the M function, and call it with parameters self, J.
foo.K = Q
From foo get the K attribute and set it to Q.
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