fix monthly idcard

@@ -28,6 +28,7 @@ class Command(BaseCommand, LoggerMixin):
                 return
 
             monthly_wb = Workbook()
+            monthly_ws = monthly_wb.get_sheet_by_name('Sheet')
 
             for d in range(1, monthrange(pre_mouth.year, pre_mouth.month)[1] + 1):
                 date_str = '{:04d}-{:02d}-{:02d}'.format(pre_mouth.year, pre_mouth.month, d)
@@ -36,12 +37,13 @@ class Command(BaseCommand, LoggerMixin):
                     print('daily excel path not exists: {0}'.format(daily_excel_path))
                     continue
 
-                monthly_ws = monthly_wb.create_sheet(date_str)
+                # monthly_ws = monthly_wb.create_sheet(date_str)
                 daily_wb = load_workbook(daily_excel_path)
                 daily_ws = daily_wb.get_sheet_by_name('身份证')
                 for row in daily_ws.iter_rows(min_row=1, values_only=True):
                     monthly_ws.append(row)
 
             monthly_excel_path = os.path.join(excel_dir, 'idcard_{0}.xlsx'.format(pre_mouth.strftime('%Y-%m')))
-            monthly_wb.remove(monthly_wb.get_sheet_by_name('Sheet'))
+            # monthly_wb.remove(monthly_wb.get_sheet_by_name('Sheet'))
+            monthly_ws.title = '身份证'
             monthly_wb.save(monthly_excel_path)