class Guetzli:
    def __init__(self, name):
        self.name = name
        
    def say(self):
        print("  --> Ich mag %s" % self.name)
        
    def umtaufen(self, neu):
        self.name = neu


zimt = Guetzli("Zimtstern")
mailand = Guetzli("Mailaenderli")

print("zimt.say():")
zimt.say()
print("mailand.say():")
mailand.say()

print("referenz = zimt")
referenz = zimt
print("referenz.say():")
referenz.say()
print("referenz.umtaufen(\"Leckerli\")")
referenz.umtaufen("Leckerli")
print("zimt.say():")
zimt.say()