def cvar_(self, col):
        """
        Returns the coefficient of variance of a column
        in percentage
        """
        try:
            v = (np.std(self.df[col]) / np.mean(self.df[col])) * 100
            return v
        except Exception as e:
            self.err(e,
                     "Can not calculate coefficient of variance")
def cvar_ ( self , col ) : try : v = ( np . std ( self . df [ col ] ) / np . mean ( self . df [ col ] ) ) * 100 return v except Exception as e : self . err ( e , "Can not calculate coefficient of variance" )
Returns the coefficient of variance of a column
        in percentage