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>>> myMean = lambda MyList : reduce(lambda x, y: x + y, MyList) / float(len(MyList))
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>>> myStd = lambda MyList : (reduce(lambda x,y : x + y , map(lambda x: (x-myMean(MyList))**2 , MyList)) / float(len(MyList)))**.5
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>>> print myStd([2,4,4,4,5,5,7,9])
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2.0
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