Python：如何添加静态类对象数组？

Question

我是一个蟒蛇新手！ 我正在上课，列表和字典，我有一个问题！

我有这段代码：

class Vacca( object ):
    Munte = dict()

    def __init__( self, nr ):
        self.nome = "VACCA_" + str( nr )
        self.numero = str(nr)
        self.mungiture = []

    def mungi( self, latte ):
        nr = self.numero
        Vacca.Munte[ nr ] = self
        Vacca.Munte[ nr ].mungiture.append( latte )

vacca = Vacca( 1 )
vacca.mungi( "white milk" )

vacca = Vacca( 1 )
vacca.mungi( "black milk" )

vacca = Vacca( 1 )
vacca.mungi( "yellow milk" )

vacca = Vacca( 2 )
vacca.mungi( "dark chocolate" )

for v in Vacca.Munte:
    print Vacca.Munte[v].mungiture

如果我运行这是结果：

['yellow milk']
['dark chocolate']

但我需要这个：

['white milk','black milk','yellow milk']
['dark chocolate']

我错了什么？