some python functions
def calc_avg(items): | |
if not items: | |
return 0 | |
total = sum(items) | |
return float(total)/len(items) | |
def std_deviation(items): | |
if not items: return 0 | |
mean = calc_avg(items) | |
variance = calc_avg([(x - mean)*(x - mean) for x in items]) | |
return math.sqrt(variance) |
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