object indexing and item assignment

[King]

class MyFloat(object):
    def __init__(self, value=0.):
        self.value = value

    def set(self, value):
        self.value = value

    def get(self):
        return self.value

class MyColor(object):
    def __init__(self, value=(0,0,0)):
        self.value = (MyFloat(value[0]),
                        MyFloat(value[1]),
                        MyFloat(value[2]))

    def set(self, value):
        self.value[0].set(value[0])
        self.value[1].set(value[1])
        self.value[2].set(value[2])

    def get(self):
        return (self.value[0].get(),
                self.value[1].get(),
                self.value[2].get())

col = MyColor()
col[0].set(0.5) # 'MyColor' object does not support indexing
col[0] = 0.5 # 'MyColor' object does not support item assignment


The last two lines of the script produce errors. (written as
comments). I know it won't work as I am expecting. One solution I can
think of is to rewrite MyFloat and MyColor by sub classing default
python types "float and "tuple". Is this the only solution?

Prashant

Python 2.6.2
Win XP 32