[UPDT] ATTENDANCE: Support CSV format for attendance import alongside Excel

attendance/views/views.py

@@ -287,7 +287,10 @@ def attendance_import(request):
     """
     if request.method == "POST":
         file = request.FILES["attendance_import"]
-        data_frame = pd.read_excel(file)
+        file_extension = file.name.split(".")[-1].lower()
+        data_frame = (
+            pd.read_csv(file) if file_extension == "csv" else pd.read_excel(file)
+        )
         attendance_dicts = data_frame.to_dict("records")
         attendance_import = process_attendance_data(attendance_dicts)
         path_info = None