diff --git a/studenteval/models.py b/studenteval/models.py
index a87ca15..cea567c 100644
--- a/studenteval/models.py
+++ b/studenteval/models.py
@@ -230,7 +230,7 @@ def import_data_csv():
                 value = line[key]
                 if key == "dtDate":
                     value = datetime.strptime(value, "%d.%m.%Y").date()
-                elif key == "Student" and value is not "":
+                elif key == "Student" and value != "":
                     print(f"user == pk{value}")
                     temp_user = User.objects.get(pk=int(value))
                     setattr(new_eval, "Student", temp_user)
@@ -240,7 +240,7 @@ def import_data_csv():
 
                 if key in ["nEval_Type","nInter_Priority","nInter_Nature","nInter_Complexity","nStudent_Role","nEval_Mode"]:
                     print(f"key [{key}] => {value}")
-                    value = int(value) if value is not "" else ""
+                    value = int(value) if value != "" else ""
 
                 setattr(new_eval, key,value)
             print(f"try to save {line}")