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from cmd import Cmd
# using ``do_`` methods

class Pirate(Cmd):
    gold = 3
    def do_loot(self, arg):
        'Seize booty from a passing ship.'
        self.gold += 1
        print('Now we gots {0} doubloons'
              .format(self.gold))
    def do_drink(self, arg):
        'Drown your sorrrows in rrrum.'
        self.gold -= 1
        print('Now we gots {0} doubloons'
              .format(self.gold))

pirate = Pirate()
pirate.cmdloop()