Average grades in export [REBORN]

evap/evaluation/tools.py

@@ -333,6 +333,11 @@ def next_row(self) -> None:
         self.cur_col = 0
         self.cur_row += 1
 
+    def next_sheet(self, sheetname: str):
+        self.cur_sheet = self.workbook.add_sheet(sheetname)
+        self.cur_row = 0
+        self.cur_col = 0
+
     def write_row[CV: CellValue](
         self,
         vals: Iterable[CV],