import math def stdDevOfLengths(L): """ L: a list of strings returns: float, the standard deviation of the lengths of the strings, or NaN if L is empty """ if len(L) == 0: return float("NaN") print len(L) curMean = stdMean(L) print curMean curVarience = stdVarience(curMean, L) print curVarience return math.sqrt(curVarience) def stdMean(L): totCalc = 0 for s in L: ##print len(s) totCalc += float(len(s)) #print totCalc return float(totCalc / len(L)) def stdVarience(mean, L): totVar = 0 for s in L: totVar += (len(s) - mean)**2 #print totVar return float(totVar / len(L)) #print float(51/7) #print stdMean(['', 'zgmto']) print stdDevOfLengths(['', 'zgmto'])
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