diff --git a/app/views/users.py b/app/views/users.py
index 7a03a899c0..79b5e095fa 100644
--- a/app/views/users.py
+++ b/app/views/users.py
@@ -35,6 +35,7 @@ Emmanuel Viennet, 2021
 """
 import datetime
 import re
+from enum import auto, IntEnum
 from xml.etree import ElementTree
 
 import flask
@@ -116,6 +117,12 @@ class ChangePasswordForm(FlaskForm):
             raise ValidationError("Mot de passe actuel incorrect, ré-essayez")
 
 
+class Mode(IntEnum):
+    WELCOME_AND_CHANGE_PASSWORD = auto()
+    WELCOME_ONLY = auto()
+    SILENT = auto()
+
+
 @bp.route("/")
 @bp.route("/index_html")
 @scodoc
@@ -529,19 +536,20 @@ def create_user_form(user_name=None, edit=0, all_roles=1):
                 )
                 return "\n".join(H) + msg + "\n" + tf[1] + F
             # Traitement initial (mode) : 3 cas
+            # cf énumération Mode
             # A: envoi de welcome + procedure de reset
             # B: envoi de welcome seulement (mot de passe saisie dans le formulaire)
             # C: Aucun envoi (mot de passe saisi dans le formulaire)
             if vals["welcome:list"] == "1":
                 if vals["reset_password:list"] == "1":
-                    mode = "A"
+                    mode = Mode.WELCOME_AND_CHANGE_PASSWORD
                 else:
-                    mode = "B"
+                    mode = Mode.WELCOME_ONLY
             else:
-                mode = "C"
+                mode = Mode.SILENT
 
             # check passwords
-            if mode == "A":
+            if mode == Mode.WELCOME_AND_CHANGE_PASSWORD:
                 vals["password"] = generate_password()
             else:
                 if vals["password"]:
@@ -567,8 +575,8 @@ def create_user_form(user_name=None, edit=0, all_roles=1):
             db.session.add(u)
             db.session.commit()
             # envoi éventuel d'un message
-            if mode == "A" or mode == "B":
-                if mode == "A":
+            if mode == Mode.WELCOME_AND_CHANGE_PASSWORD or mode == Mode.WELCOME_ONLY:
+                if mode == Mode.WELCOME_AND_CHANGE_PASSWORD:
                     token = u.get_reset_password_token()
                 else:
                     token = None