diff --git a/app/scodoc/gen_tables.py b/app/scodoc/gen_tables.py
index 67a52261c..c199d0b3e 100644
--- a/app/scodoc/gen_tables.py
+++ b/app/scodoc/gen_tables.py
@@ -482,9 +482,9 @@ class GenTable(object):
             ses.append_blank_row()  # empty line
             ses.append_single_cell_row(self.origin, style_base)
         if wb is None:
-            return ses.generate_standalone()
+            return ses.generate()
         else:
-            ses.generate_embeded()
+            ses.generate()
 
     def text(self):
         "raw text representation of the table"
diff --git a/app/scodoc/sco_excel.py b/app/scodoc/sco_excel.py
index b6f0b873e..ab40af897 100644
--- a/app/scodoc/sco_excel.py
+++ b/app/scodoc/sco_excel.py
@@ -65,14 +65,6 @@ class COLORS(Enum):
     LIGHT_YELLOW = "FFFFFF99"
 
 
-def send_from_flask(data, filename, mime=scu.XLSX_MIMETYPE):
-    filename = scu.make_filename(filename)
-    response = make_response(data)
-    response.headers["Content-Type"] = mime
-    response.headers["Content-Disposition"] = 'attachment; filename="%s"' % filename
-    return response
-
-
 def send_excel_file(request, data, filename, mime=scu.XLSX_MIMETYPE):
     """publication fichier.
     (on ne doit rien avoir émis avant, car ici sont générés les entetes)
@@ -211,7 +203,7 @@ class ScoExcelSheet:
     * pour finit appel de la méthode de génération
     """
 
-    def __init__(self, sheet_name="feuille", default_style=None, ws=None):
+    def __init__(self, sheet_name="feuille", default_style=None, wb=None):
         """Création de la feuille. sheet_name
         -- le nom de la feuille default_style
         -- le style par défaut des cellules ws
@@ -224,13 +216,13 @@ class ScoExcelSheet:
         if default_style is None:
             default_style = excel_make_style()
         self.default_style = default_style
-        if ws is None:
+        if wb is None:
             self.wb = Workbook()
             self.ws = self.wb.active
             self.ws.title = self.sheet_name
         else:
             self.wb = None
-            self.ws = ws
+            self.ws = wb
         # internal data
         self.rows = []  # list of list of cells
         self.column_dimensions = {}
diff --git a/app/scodoc/sco_placement.py b/app/scodoc/sco_placement.py
index dd5e97eb5..20f9cdc7a 100644
--- a/app/scodoc/sco_placement.py
+++ b/app/scodoc/sco_placement.py
@@ -46,6 +46,7 @@ from wtforms import (
     RadioField,
     HiddenField,
     SelectMultipleField,
+    BooleanField,
 )
 import app.scodoc.sco_utils as scu
 import app.scodoc.notesdb as ndb
@@ -75,9 +76,7 @@ TOUS = "Tous"
 
 def _get_group_info(evaluation_id):
     # groupes
-    groups = sco_groups.do_evaluation_listegroupes(
-        evaluation_id, include_default=True
-    )
+    groups = sco_groups.do_evaluation_listegroupes(evaluation_id, include_default=True)
     has_groups = False
     groups_tree = {}
     for group in groups:
@@ -92,6 +91,7 @@ def _get_group_info(evaluation_id):
             nb_groups = len(groups_tree)
     return groups_tree, has_groups, nb_groups
 
+
 class PlacementForm(FlaskForm):
     """Formulaire pour placement des étudiants en Salle"""
 
@@ -137,7 +137,9 @@ class PlacementForm(FlaskForm):
         eval_data = sco_evaluations.do_evaluation_list({"evaluation_id": evaluation_id})
         if not eval_data:
             raise ScoValueError("invalid evaluation_id")
-        self.groups_tree, self.has_groups, self.nb_groups = _get_group_info(evaluation_id)
+        self.groups_tree, self.has_groups, self.nb_groups = _get_group_info(
+            evaluation_id
+        )
         if self.has_groups:
             choices = []
             for partition in self.groups_tree:
@@ -223,7 +225,6 @@ class PlacementRunner:
         self.eval_data = sco_evaluations.do_evaluation_list(
             {"evaluation_id": self.evaluation_id}
         )[0]
-        self.cnx = ndb.GetDBConnexion()
         self.groups = sco_groups.listgroups(self.groups_ids)
         self.gr_title_filename = sco_groups.listgroups_filename(self.groups)
         # gr_title = sco_groups.listgroups_abbrev(d['groups'])
@@ -282,7 +283,9 @@ class PlacementRunner:
         self.plan = self._affectation_places()
 
     def _build_listetud(self):
-        get_all_students = None in [g["group_name"] for g in self.groups]  # tous les etudiants
+        get_all_students = None in [
+            g["group_name"] for g in self.groups
+        ]  # tous les etudiants
         etudids = sco_groups.do_evaluation_listeetuds_groups(
             self.evaluation_id,
             self.groups,
@@ -292,7 +295,7 @@ class PlacementRunner:
         listetud = []  # liste de couples (nom,prenom)
         for etudid in etudids:
             # infos identite etudiant (xxx sous-optimal: 1/select par etudiant)
-            ident = sco_etud.etudident_list(self.cnx, {"etudid": etudid})[0]
+            ident = sco_etud.etudident_list(ndb.GetDBConnexion(), {"etudid": etudid})[0]
             # infos inscription
             inscr = sco_formsemestre_inscriptions.do_formsemestre_inscription_list(
                 {
@@ -319,13 +322,9 @@ class PlacementRunner:
         return plan
 
     def _production_xls(self):
-        filename = "placement_%s_%s%s" % (
-            self.evalname,
-            self.gr_title_filename,
-            scu.XLSX_SUFFIX,
-        )
+        filename = "placement_%s_%s" % (self.evalname, self.gr_title_filename)
         xls = self._excel_feuille_placement()
-        return sco_excel.send_from_flask(xls, filename)
+        return scu.send_file(xls, filename, scu.XLSX_SUFFIX, scu.XLSX_MIMETYPE)
 
     def _production_pdf(self):
         pdf_title = "<br/>".join(self.desceval)