A simpler singleton pattern?

[lee lion]

     singleton pattern is a way to provide one and only one object of a 
particular type. There are many ways to implement a singleton pattern, is 
the below one?
class OnlyOne:
    instance = None
    def __init__(self, arg):
        OnlyOne.instance = arg
    def __getattr__(self, name):
        return getattr(OnlyOne.instance, name)

if __name__ == "__main__":
    x = OnlyOne("x")
    print x
    y = OnlyOne("y")
    print y
    print x
    print `x`
    print `y`

The output is:
x
y
y
'y'
'y'



"The best way of living is to earn a little more than you cost and to cost 
just as you need to."
                                      Li Hang

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