Round floats in a column. Numbers are going to be
        converted to floats if they are not already

        :param col: column name
        :type col: str
        :param precision: float precision, defaults to 2
        :param precision: int, optional

        :example: ``ds.roundvals("mycol")``

def roundvals(self, col: str, precision: int=2):
        """
        Round floats in a column. Numbers are going to be
        converted to floats if they are not already

        :param col: column name
        :type col: str
        :param precision: float precision, defaults to 2
        :param precision: int, optional

        :example: ``ds.roundvals("mycol")``
        """
        try:
            self.df[col] = self.df[col].astype("float64")
            self.df[col] = self.df[col].apply(lambda x: round(x, precision))
        except Exception as e:
            self.err(e, "Can not round column values")
            return
        self.ok("Rounded values in column " + col)