diff --git a/app/scodoc/htmlutils.py b/app/scodoc/htmlutils.py
index bd3490be1..23e3279d4 100644
--- a/app/scodoc/htmlutils.py
+++ b/app/scodoc/htmlutils.py
@@ -30,9 +30,8 @@
 from __future__ import absolute_import
 from flask import g, url_for
 
-from . import listhistogram
-
 import app.scodoc.sco_utils as scu
+from . import listhistogram
 
 
 def horizontal_bargraph(value, mark):
diff --git a/app/scodoc/listhistogram.py b/app/scodoc/listhistogram.py
index 2e19a6b43..ce25d00f9 100644
--- a/app/scodoc/listhistogram.py
+++ b/app/scodoc/listhistogram.py
@@ -1,7 +1,8 @@
+from __future__ import absolute_import
 import math
 
 
-def ListHistogram(L, nbins, minmax=None, normalize=None):
+def ListHistogram(L, nbins, minmax=None):
     """Compute histogram of a list.
     Does not use Numeric or numarray.
 
diff --git a/app/scodoc/notes_cache.py b/app/scodoc/notes_cache.py
index a8d2b5c59..18104eea0 100644
--- a/app/scodoc/notes_cache.py
+++ b/app/scodoc/notes_cache.py
@@ -31,6 +31,7 @@
   NOTA: inutilisable dans une instance Zope (can't pickle functions)
 """
 
+from __future__ import absolute_import
 from app.scodoc.notes_log import log
 
 
@@ -45,7 +46,7 @@ class CacheFunc(object):
         self.cache = {}  # { arguments : function result }
 
     def __call__(self, *args):
-        if self.cache.has_key(args):
+        if args in self.cache:
             # log('cache hit %s' % str(args))
             return self.cache[args]
         else:
diff --git a/app/scodoc/notes_log.py b/app/scodoc/notes_log.py
index abd8723e7..9796bf2df 100644
--- a/app/scodoc/notes_log.py
+++ b/app/scodoc/notes_log.py
@@ -1,6 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
+from __future__ import absolute_import
 import os
 import re
 import inspect
@@ -67,7 +68,7 @@ def retreive_request(skip=0):
     """
 
     def search(frame):
-        if frame.f_locals.has_key("REQUEST"):
+        if "REQUEST" in frame.f_locals:
             return frame.f_locals["REQUEST"]
         if frame.f_back:
             return search(frame.f_back)
@@ -99,9 +100,9 @@ def retreive_dept():
 
 # Alarms by email:
 def sendAlarm(context, subj, txt):
-    import sco_utils
-    import sco_emails
-    import sco_preferences
+    from . import sco_utils
+    from . import sco_emails
+    from . import sco_preferences
 
     msg = MIMEMultipart()
     subj = Header(subj, sco_utils.SCO_ENCODING)
diff --git a/app/scodoc/notes_table.py b/app/scodoc/notes_table.py
index 528c2c85b..965859a12 100644
--- a/app/scodoc/notes_table.py
+++ b/app/scodoc/notes_table.py
@@ -27,6 +27,7 @@
 
 """Calculs sur les notes et cache des resultats
 """
+from __future__ import absolute_import
 from types import StringType, FloatType
 import time
 import pdb
@@ -121,7 +122,7 @@ def get_sem_ues_modimpls(context, formsemestre_id, modimpls=None):
         if not mod["ue_id"] in uedict:
             ue = sco_edit_ue.do_ue_list(context, args={"ue_id": mod["ue_id"]})[0]
             uedict[ue["ue_id"]] = ue
-    ues = uedict.values()
+    ues = list(uedict.values())
     ues.sort(key=lambda u: u["numero"])
     return ues, modimpls
 
@@ -259,7 +260,7 @@ class NotesTable:
         self.comp_ue_capitalisees()
 
         # Liste des moyennes de tous, en chaines de car., triées
-        self._ues = uedict.values()
+        self._ues = list(uedict.values())
         self._ues.sort(key=lambda u: u["numero"])
 
         T = []
@@ -421,7 +422,7 @@ class NotesTable:
 
     def get_etud_etat(self, etudid):
         "Etat de l'etudiant: 'I', 'D', DEF ou '' (si pas connu dans ce semestre)"
-        if self.inscrdict.has_key(etudid):
+        if etudid in self.inscrdict:
             return self.inscrdict[etudid]["etat"]
         else:
             return ""
@@ -1081,7 +1082,7 @@ class NotesTable:
         )
         decisions_jury_ues = {}
         for (etudid, ue_id, code, event_date) in cursor.fetchall():
-            if not decisions_jury_ues.has_key(etudid):
+            if etudid not in decisions_jury_ues:
                 decisions_jury_ues[etudid] = {}
             # Calcul des ECTS associes a cette UE:
             ects = 0.0
diff --git a/app/scodoc/notesdb.py b/app/scodoc/notesdb.py
index 26fce29ed..b46b2c9b6 100644
--- a/app/scodoc/notesdb.py
+++ b/app/scodoc/notesdb.py
@@ -1,12 +1,12 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
+from __future__ import absolute_import
 import pdb, os, sys, string
 import traceback
 import psycopg2
 import psycopg2.pool
 import psycopg2.extras
-import thread
 
 from flask import g
 
@@ -36,27 +36,6 @@ def unquote(s):
     return s.replace("&", "&")
 
 
-# Ramene une connexion a la base de donnees scolarite
-# pour l'instance donnee par context
-# La connexion est unique (réutilisée) pour chaque thread
-# et est par défaut en autocommit
-# _pools = {}
-#
-#
-# def GetDBConnexion(autocommit=True):
-#     """connexion to the DB of a departement"""
-#     pool = _pools.get(scu.get_db_cnx_string(), None)
-#     if not pool:
-#         pool = psycopg2.pool.ThreadedConnectionPool(2, 8, dsn=scu.get_db_cnx_string())
-#         _pools[scu.get_db_cnx_string()] = pool
-#         # log('GetDBConnexion: created pool for "%s"' % scu.get_db_cnx_string())
-#     cnx = pool.getconn(key=(thread.get_ident(), autocommit))
-#     # log('GetDBConnexion: autocommit=%s cnx=%s' % (autocommit,cnx))
-#     if cnx.autocommit != autocommit:
-#         cnx.autocommit = autocommit
-#     return cnx
-
-
 def open_dept_connection():
     """Open a connection to the current dept db"""
     # log("open_dept_connection to " + scu.get_db_cnx_string())  # XXX
@@ -75,22 +54,6 @@ def GetDBConnexion(autocommit=True):  # on n'utilise plus autocommit
     return g.db_conn
 
 
-# Same for users:
-_users_pools = {}
-
-
-def GetUsersDBConnexion(context, autocommit=True):
-    pool = _users_pools.get(scu.get_db_cnx_string(), None)
-    if not pool:
-        pool = psycopg2.pool.ThreadedConnectionPool(2, 8, dsn=scu.get_db_cnx_string())
-        _users_pools[scu.get_db_cnx_string()] = pool
-        log('GetUsersDBConnexion: created pool for "%s"' % scu.get_db_cnx_string())
-    cnx = pool.getconn(key=(thread.get_ident(), autocommit))
-    if cnx.autocommit != autocommit:
-        cnx.autocommit = autocommit
-    return cnx
-
-
 # Nota:  on pourrait maintenant utiliser psycopg2.extras.DictCursor
 class ScoDocCursor(psycopg2.extensions.cursor):
     """A database cursor emulating some methods of psycopg v1 cursors"""
@@ -130,7 +93,7 @@ def DBInsertDict(cnx, table, vals, commit=0, convert_empty_to_nulls=1):
             if vals[col] == "":
                 vals[col] = None
     # open('/tmp/vals','a').write( str(vals) + '\n' )
-    cols = vals.keys()
+    cols = list(vals.keys())
     colnames = ",".join(cols)
     fmt = ",".join(["%%(%s)s" % col for col in cols])
     # print 'insert into %s (%s) values (%s)' % (table,colnames,fmt)
@@ -329,13 +292,13 @@ class EditableTable:
     def create(self, cnx, args, has_uniq_values=False):
         "create object in table"
         vals = dictfilter(args, self.dbfields, self.filter_nulls)
-        if vals.has_key(self.id_name) and not self.allow_set_id:
+        if self.id_name in vals and not self.allow_set_id:
             del vals[self.id_name]
         if self.html_quote:
             quote_dict(vals)  # quote all HTML markup
         # format value
         for title in vals.keys():
-            if self.input_formators.has_key(title):
+            if title in self.input_formators:
                 vals[title] = self.input_formators[title](vals[title])
         # insert
         oid = DBInsertDict(cnx, self.table_name, vals, commit=True)
@@ -405,7 +368,7 @@ class EditableTable:
             if v is None and self.convert_null_outputs_to_empty:
                 v = ""
             # format value
-            if not disable_formatting and self.output_formators.has_key(k):
+            if not disable_formatting and k in self.output_formators:
                 try:  # XXX debug "isodate"
                     v = self.output_formators[k](v)
                 except:
@@ -422,7 +385,7 @@ class EditableTable:
             quote_dict(vals)  # quote HTML
         # format value
         for title in vals.keys():
-            if self.input_formators.has_key(title):
+            if title in self.input_formators:
                 try:
                     vals[title] = self.input_formators[title](vals[title])
                 except:
@@ -491,7 +454,7 @@ def dictfilter(d, fields, filter_nulls=True):
     # returns a copy of d with only keys listed in "fields" and non null values
     r = {}
     for f in fields:
-        if d.has_key(f) and (d[f] != None or not filter_nulls):
+        if f in d and (d[f] != None or not filter_nulls):
             try:
                 val = d[f].strip()
             except:
@@ -656,7 +619,7 @@ def UniqListofDicts(L, key):
     d = {}
     for item in L:
         d[item[key]] = item
-    return d.values()
+    return list(d.values())
 
 
 #
diff --git a/app/scodoc/sco_users.py b/app/scodoc/sco_users.py
index e32a6373c..a0874005e 100644
--- a/app/scodoc/sco_users.py
+++ b/app/scodoc/sco_users.py
@@ -90,7 +90,6 @@ def is_valid_password(cleartxt):
 # ---------------
 
 # ---------------
-# XXX TODO supprimer ndb.GetUsersDBConnexion
 
 
 def index_html(context, REQUEST, all_depts=False, with_inactives=False, format="html"):