<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def to_int(self, *cols, **kwargs):
 """ Convert some column values to integers :param \*cols: names of the colums :type \*cols: str, at least one :param \*\*kwargs: keyword arguments for ``pd.to_numeric`` :type \*\*kwargs: optional :example: ``ds.to_int("mycol1", "mycol2", errors="coerce")`` """

        try:
            for col in cols:
                self.df[col] = pd.to_numeric(self.df[col], **kwargs)
        except Exception as e:
            self.err(e, "Can not convert column values to integer")
            return
        self.ok("Converted column values to integers")