help needed with class and method confusion

[EricN]

Here's one way to do it (undoubtedly there are other ways as well). 
Sorry, I couldn't loop the moons.  Probably a programmer more clever
than I could write a factory pattern for it.

class Moon:
    def __init__(self, name, diameter = 0.0, planet = "unknown"):
        self.NAME = name
        self.DIAMETER = diameter
        self.HOMEPLANET = planet

    def setMoonName(self, name):
        self.NAME = str(name)

    def getMoonName(self):
        return self.NAME

    def setMoonDiameter(self, diam):
        self.DIAMETER = float(diam)

    def getMoonDiameter(self):
        return self.DIAMETER

    def setMoonHomePlanet(self, planet):
        self.HOMEPLANET = str(planet)

    def getMoonHomePlanet(self):
        return self.HOMEPLANET


if __name__ == "__main__":
    moons = []
    Io = Moon("Io", 1.0, "Jupiter")
    moons.append(Io)
    Europa = Moon("Europa", 2.0, "Jupiter")
    moons.append(Europa)
    Ganymeade = Moon("Ganymeade", 3.0, "Jupiter")
    moons.append(Ganymeade)
    Titan = Moon("Titan", 3.0, "Saturn")
    moons.append(Titan)
    
    for x in range(len(moons)):
        print moons[x].getMoonName()
        print moons[x].getMoonDiameter()
        print moons[x].getMoonHomePlanet()
        print