limitedInstantiation.py

class Motor(object):
    def __init__(self):
        pass

motorA = Motor()
motorB = Motor()
motorC = Motor()
motorD = Motor()
Motor.__init__ = lambda: None
del Motor


class motors(object): 
    A = motorA
    B = motorB
    C = motorC
    D = motorD
    def __getitem__(self, i):
        if i == 1 or i == 'A': return self.A
        if i == 2 or i == 'B': return self.B
        if i == 3 or i == 'C': return self.C
        if i == 4 or i == 'D': return self.D
        raise IndexError("Not a valid motor, try 1-4 or 'A'-'D'")
motors = motors()