diff --git a/notes_tools/extract.py b/notes_tools/extract.py
index 9c08100..ada18ec 100644
--- a/notes_tools/extract.py
+++ b/notes_tools/extract.py
@@ -8,6 +8,7 @@ from path import Path
 
 
 notes_path = Path("./")
+
 notStudent = ["Trimestre", "Nom", "Date", "Exercice", "Question", "Competence", "Domaine", "Commentaire", "Bareme", "Niveau"]
 pure_marks = ["Malus", "Bonus", "Presentation"]
 
@@ -33,10 +34,11 @@ def get_class_ws(classe, path = notes_path):
     """
     From the name of a classe, returns pd.ExcelFile
     """
-    if classe in list_classes(path):
-        return pd.ExcelFile(notes_path/classe+".xlsx")
+    p = Path(path)
+    if classe in list_classes(p):
+        return pd.ExcelFile(p/classe+".xlsx")
     else:
-        raise ValueError("This class is not disponible in {p}. You have to choose in {c}".format(p = path, c = list_classes(path)))
+        raise ValueError("This class is not disponible in {p}. You have to choose in {c}".format(p = p, c = list_classes(p)))
 
 def extract_students(df, notStudent = notStudent):
     """ Extract the list of students from df """