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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 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)