(self)
return math.sqrt(self.get_var())
get current standard deviation
get current standard deviation
get current standard deviation
def get_stddev(self):
        "get current standard deviation"
        if not self.values:
            return 0
        return math.sqrt(self.get_var())
def get_stddev ( self ) : if not self . values : return 0 return math . sqrt ( self . get_var ( ) )