diff --git a/kfet/urls.py b/kfet/urls.py
index 0982a46e..d16aba84 100644
--- a/kfet/urls.py
+++ b/kfet/urls.py
@@ -240,7 +240,7 @@ urlpatterns = [
     # -----
     path("purchases", views.purchases_csv, name="kfet.purchases"),
     path(
-        "purchases/<int:st_y>-<int:st_m>/<int:en_y>-<int:en_m>",
+        "purchases/<int:start_year>-<int:start_month>/<int:end_year>-<int:end_month>",
         views.purchases_csv,
         name="kfet.purchases",
     ),
diff --git a/kfet/views.py b/kfet/views.py
index 78de56cc..48d75db7 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -2458,30 +2458,32 @@ class ScaleMixin(object):
 
 
 @teamkfet_required
-def purchases_csv(request, st_y=None, st_m=None, en_y=None, en_m=None):
+def purchases_csv(
+    request, start_year=None, start_month=None, end_year=None, end_month=None
+):
     """
     Renvoie un historique des achats en K-Fêt, par mois et sur une période donnée
     (Par défault les 12 mois précédents)
     """
     # Si on ne spécifie pas tout l'intervalle, on prend les 12 derniers mois
-    if (st_y and st_m and en_y and en_m) is None:
+    if (start_year and start_month and end_year and end_month) is None:
         # On utilise replace pour gérer le cas des années bissextiles sans
         # changer de mois
         end = date.today().replace(day=1)
         start = end - timedelta(days=365)
-        st_y = start.year
-        st_m = start.month
-        en_y = end.year
-        en_m = end.month
+        start_year = start.year
+        start_month = start.month
+        end_year = end.year
+        end_month = end.month
 
     # On calcule la liste des premiers jours des mois dont on veut avoir les
     # ventes
     dates = []
 
-    for year in range(st_y, en_y + 1):
-        m_st = st_m if year == st_y else 1
-        m_en = en_m if year == en_y else 12
-        for month in range(m_st, m_en + 1):
+    for year in range(start_year, end_year + 1):
+        month_start = start_month if year == start_year else 1
+        month_end = end_month if year == end_year else 12
+        for month in range(month_start, month_end + 1):
             dates.append(date(year, month, 1))
 
     # On rajoute le mois suivant