code: def roundvals(self, col: str, precision: int=2):
          
          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)
docs: 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")``