(self, value=float("nan"))
constructor accepts initial value
constructor accepts initial value
constructor accepts initial value
def __init__(self, value=float("nan")):
        "constructor accepts initial value"
        super(SimpleGauge, self).__init__()
        self._value = value
def __init__ ( self , value = float ( "nan" ) ) : super ( SimpleGauge , self ) . __init__ ( ) self . _value = value