def avg(self, func=lambda x: x):
        """
        Returns the average value of data elements
        :param func: lambda expression to transform data
        :return: average value as float object
        """
        count = self.count()
        if count == 0:
            raise NoElementsError(u"Iterable contains no elements")
        return float(self.sum(func)) / float(count)
def avg ( self , func = lambda x : x ) : count = self . count ( ) if count == 0 : raise NoElementsError ( u"Iterable contains no elements" ) return float ( self . sum ( func ) ) / float ( count )
Returns the average value of data elements
        :param func: lambda expression to transform data
        :return: average value as float object