def to_float(self, col: str, **kwargs):
        """
        Convert colums values to float

        :param col: name of the colum
        :type col: str, at least one
        :param \*\*kwargs: keyword arguments for ``df.astype``
        :type \*\*kwargs: optional

        :example: ``ds.to_float("mycol1")``
        """
        try:
            self.df[col] = self.df[col].astype(np.float64, **kwargs)
            self.ok("Converted column values to float")
        except Exception as e:
            self.err(e, "Error converting to float")