diff --git a/app/scodoc/sco_edt_cal.py b/app/scodoc/sco_edt_cal.py
index 61f223825..39c9541d7 100644
--- a/app/scodoc/sco_edt_cal.py
+++ b/app/scodoc/sco_edt_cal.py
@@ -63,10 +63,10 @@ def formsemestre_get_ics_url(sem):
         ics_url = ics_url_tmpl.format(sem=sem)
     except:
         log(
-            "Exception in formsemestre_get_ics_url(formsemestre_id=%s)"
-            % sem["formsemestre_id"]
+            f"""Exception in formsemestre_get_ics_url(formsemestre_id={sem["formsemestre_id"]})
+            ics_url_tmpl='{ics_url_tmpl}'
+            """
         )
-        log("ics_url_tmpl='%s'" % ics_url_tmpl)
         log(traceback.format_exc())
         return None
     return ics_url
@@ -79,10 +79,9 @@ def formsemestre_load_ics(sem):
     if not ics_url:
         ics_data = ""
     else:
-        log("Loading edt from %s" % ics_url)
-        f = urllib.request.urlopen(
-            ics_url, timeout=5
-        )  # 5s TODO: add config parameter, eg for slow networks
+        log(f"Loading edt from {ics_url}")
+        # 5s TODO: add config parameter, eg for slow networks
+        f = urllib.request.urlopen(ics_url, timeout=5)
         ics_data = f.read()
         f.close()
 
@@ -90,12 +89,6 @@ def formsemestre_load_ics(sem):
     return cal
 
 
-# def formsemestre_edt_groups_used(sem):
-#    """L'ensemble des groupes EDT utilisés dans l'emploi du temps publié"""
-#    cal = formsemestre_load_ics(sem)
-#    return {e["X-GROUP-ID"].decode("utf8") for e in events}
-
-
 def get_edt_transcodage_groups(formsemestre_id):
     """-> { nom_groupe_edt : nom_groupe_scodoc }"""
     # TODO: valider ces données au moment où on enregistre les préférences
@@ -116,10 +109,10 @@ def get_edt_transcodage_groups(formsemestre_id):
             edt2sco[fs[0]] = fs[1]
             sco2edt[fs[1]] = fs[0]
         else:
-            msg = "ligne %s invalide" % line_num
+            msg = f"ligne {line_num} invalide"
         line_num += 1
 
-    log("sco2edt=%s" % pprint.pformat(sco2edt))
+    log(f"sco2edt={pprint.pformat(sco2edt)}")
     return edt2sco, sco2edt, msg
 
 
@@ -152,13 +145,6 @@ def group_edt_json(group_id, start="", end=""):  # actuellement inutilisé
     return scu.sendJSON(J)
 
 
-"""XXX
-for e in events:
-    if 'DESCRIPTION' in e:
-        print e.decoded('DESCRIPTION')
-"""
-
-
 def experimental_calendar(group_id=None, formsemestre_id=None):  # inutilisé
     """experimental page"""
     return "\n".join(