Python的property

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class OldResistor(object):
    def __init__(self, ohms):
        self.__ohms = ohms

    def get_ohms(self):
        return self.__ohms

    def set_ohms(self, ohms):
        self.__ohms = ohms


if __name__ == '__main__':
    r0 = OldResistor(50e3)
    print "Before: %5r", r0.get_ohms()
    r0.set_ohms(10e3)
    print "After: %5r", r0.get_ohms()

    r0.set_ohms(r0.get_ohms() + 5e3)
    print "SelfAdd: %5r", r0.get_ohms()