Write data into xlsx worksheet.

def wr_data(self, xlsx_data, row_i, worksheet):
        """Write data into xlsx worksheet."""
        fld2fmt = self.vars.fld2fmt
        # User may specify to skip rows based on values in row
        prt_if = self.vars.prt_if
        # User may specify a subset of columns to print or
        # a column ordering different from the _fields seen in the namedtuple
        prt_flds = self.wbfmtobj.get_prt_flds()
        get_wbfmt = self.wbfmtobj.get_wbfmt
        if self.vars.sort_by is not None:
            xlsx_data = sorted(xlsx_data, key=self.vars.sort_by)
        try:
            for data_nt in xlsx_data:
                if prt_if is None or prt_if(data_nt):
                    wbfmt = get_wbfmt(data_nt)  # xlsxwriter.format.Format created w/add_format
                    # Print an xlsx row by printing each column in order.
                    for col_i, fld in enumerate(prt_flds):
                        try:
                            # If fld "format_txt" present, use val for formatting, but don't print.
                            val = getattr(data_nt, fld, "")
                            # Optional user-formatting of specific fields, eg, pval: "{:8.2e}"
                            # If field value is empty (""), don't use fld2fmt
                            if fld2fmt is not None and fld in fld2fmt and val != "" and val != "*":
                                val = fld2fmt[fld].format(val)
                            worksheet.write(row_i, col_i, val, wbfmt)
                        except:
                            raise RuntimeError(self._get_err_msg(row_i, col_i, fld, val, prt_flds))
                    row_i += 1
        except RuntimeError as inst:
            import traceback
            traceback.print_exc()
            sys.stderr.write("\n  **FATAL in wr_data: {MSG}\n\n".format(MSG=str(inst)))
            sys.exit(1)
        return row_i