diff --git a/app/scodoc/TrivialFormulator.py b/app/scodoc/TrivialFormulator.py
index b86b1ae41a..1a0eeaf7e1 100644
--- a/app/scodoc/TrivialFormulator.py
+++ b/app/scodoc/TrivialFormulator.py
@@ -9,7 +9,7 @@
    v 1.2
 """
 
-from types import BooleanType, StringType, UnicodeType
+from types import BooleanType, UnicodeType
 
 
 def TrivialFormulator(
@@ -745,7 +745,7 @@ def dict2js(d):
                 v = "true"
             else:
                 v = "false"
-        elif type(v) == StringType or type(v) == UnicodeType:
+        elif isinstance(v, str):  # ne marchera pas en python2
             v = '"' + v + '"'
 
         r.append("%s: %s" % (k, v))
@@ -756,7 +756,7 @@ def tf_error_message(msg):
     """html for form error message"""
     if not msg:
         return ""
-    if type(msg) == StringType:
+    if isinstance(msg, str):
         msg = [msg]
     return (
         '<ul class="tf-msg"><li class="tf-msg">%s</li></ul>'
diff --git a/app/scodoc/notes_table.py b/app/scodoc/notes_table.py
index 0888048402..6f91befd67 100644
--- a/app/scodoc/notes_table.py
+++ b/app/scodoc/notes_table.py
@@ -27,7 +27,7 @@
 
 """Calculs sur les notes et cache des resultats
 """
-from types import StringType, FloatType
+from types import FloatType
 import time
 import pdb
 import inspect
diff --git a/app/scodoc/notesdb.py b/app/scodoc/notesdb.py
index da1e527500..767921262c 100644
--- a/app/scodoc/notesdb.py
+++ b/app/scodoc/notesdb.py
@@ -13,7 +13,6 @@ from flask import g
 import app.scodoc.sco_utils as scu
 from app.scodoc.notes_log import log
 from app.scodoc.sco_exceptions import ScoException, ScoValueError, NoteProcessError
-from types import StringType
 from cgi import escape
 import datetime
 
@@ -24,7 +23,7 @@ def quote_dict(d):
     "html quote all values in dict"
     for k in d.keys():
         v = d[k]
-        if type(v) == StringType:
+        if isinstance(v, str):
             d[k] = quote_html(v, quote=True)
 
 
@@ -475,7 +474,7 @@ def DateDMYtoISO(dmy, null_is_empty=False):
             return ""
         else:
             return None
-    if type(dmy) != StringType:
+    if not isinstance(dmy, str):
         return dmy.strftime("%Y-%m-%d")
 
     t = dmy.split("/")
diff --git a/app/scodoc/sco_bulletins.py b/app/scodoc/sco_bulletins.py
index cb85a60b86..97f777bf16 100644
--- a/app/scodoc/sco_bulletins.py
+++ b/app/scodoc/sco_bulletins.py
@@ -29,7 +29,6 @@
 
 """
 import time
-from types import StringType
 import pprint
 import email
 from email.mime.multipart import MIMEMultipart
@@ -249,7 +248,7 @@ def formsemestre_bulletinetud_dict(
         I["sum_ects"] = 0
         I["sum_ects_capitalises"] = 0
     I["moy_moy"] = scu.fmt_note(nt.moy_moy)  # moyenne des moyennes generales
-    if type(moy_gen) != StringType and type(nt.moy_moy) != StringType:
+    if (not isinstance(moy_gen, str)) and (not isinstance(nt.moy_moy, str)):
         I["moy_gen_bargraph_html"] = "&nbsp;" + htmlutils.horizontal_bargraph(
             moy_gen * 5, nt.moy_moy * 5
         )
@@ -299,7 +298,7 @@ def formsemestre_bulletinetud_dict(
             u["cur_moy_ue_txt"] = scu.fmt_note(ue_status["cur_moy_ue"])
         else:
             x = scu.fmt_note(nt.bonus[etudid], keep_numeric=True)
-            if type(x) == StringType:
+            if isinstance(x, str):
                 u["cur_moy_ue_txt"] = "pas de bonus"
             else:
                 u["cur_moy_ue_txt"] = "bonus de %.3g points" % x
diff --git a/app/scodoc/sco_debouche.py b/app/scodoc/sco_debouche.py
index 8895c9c12c..cb445d439e 100644
--- a/app/scodoc/sco_debouche.py
+++ b/app/scodoc/sco_debouche.py
@@ -28,7 +28,6 @@
 """
 Rapport (table) avec dernier semestre fréquenté et débouché de chaque étudiant
 """
-from types import StringType
 import safehtml
 
 from flask import url_for, g
@@ -377,7 +376,7 @@ def itemsuivi_tag_set(context, itemsuivi_id="", taglist=[], REQUEST=None):
         raise AccessDenied("Vous n'avez pas le droit d'effectuer cette opération !")
     if not taglist:
         taglist = []
-    elif type(taglist) == StringType:
+    elif isinstance(taglist, str):
         taglist = taglist.split(",")
     taglist = [t.strip() for t in taglist]
     # log('itemsuivi_tag_set: itemsuivi_id=%s taglist=%s' % (itemsuivi_id, taglist))
diff --git a/app/scodoc/sco_excel.py b/app/scodoc/sco_excel.py
index 1860549598..ea771088db 100644
--- a/app/scodoc/sco_excel.py
+++ b/app/scodoc/sco_excel.py
@@ -29,7 +29,7 @@
 """ Excel file handling
 """
 import time, datetime
-from types import StringType, IntType, FloatType, LongType
+from types import IntType, FloatType, LongType
 
 from pyExcelerator import *
 
diff --git a/app/scodoc/sco_formulas.py b/app/scodoc/sco_formulas.py
index e559074c63..fed0ebacec 100644
--- a/app/scodoc/sco_formulas.py
+++ b/app/scodoc/sco_formulas.py
@@ -29,7 +29,7 @@
 """
 
 import operator
-from types import FloatType, IntType, LongType, StringType
+from types import FloatType, IntType, LongType
 from functools import reduce
 
 
@@ -74,7 +74,7 @@ class NoteVector(object):
         try:
             return self.v[i]
         except:
-            if type(i) == StringType:
+            if isinstance(i, str):
                 return self.v[self.name_idx[i]]
             else:
                 raise IndexError("index %s out of range" % i)
diff --git a/app/scodoc/sco_liste_notes.py b/app/scodoc/sco_liste_notes.py
index 0d856e6425..08e535fb4f 100644
--- a/app/scodoc/sco_liste_notes.py
+++ b/app/scodoc/sco_liste_notes.py
@@ -28,7 +28,6 @@
 """Liste des notes d'une évaluation
 """
 import six.moves.urllib.request, six.moves.urllib.parse, six.moves.urllib.error
-from types import StringType
 from operator import itemgetter
 
 from flask import url_for, g
@@ -672,7 +671,7 @@ def _add_moymod_column(
         )  # note sur 20, ou 'NA','NI'
         row[col_id] = scu.fmt_note(val, keep_numeric=keep_numeric)
         row["_" + col_id + "_td_attrs"] = ' class="moyenne" '
-        if type(val) != StringType:
+        if isinstance(val, str):
             notes.append(val)
             nb_notes = nb_notes + 1
             sum_notes += val
diff --git a/app/scodoc/sco_pdf.py b/app/scodoc/sco_pdf.py
index c415a776e2..a7d53b85ce 100644
--- a/app/scodoc/sco_pdf.py
+++ b/app/scodoc/sco_pdf.py
@@ -35,7 +35,6 @@ import time
 import cStringIO
 import re
 import os
-from types import StringType
 import unicodedata
 import traceback
 import reportlab
@@ -249,7 +248,7 @@ class ScolarsPageTemplate(PageTemplate):
 
         # ---- Filigranne (texte en diagonal en haut a gauche de chaque page)
         if self.filigranne:
-            if type(self.filigranne) == StringType:
+            if isinstance(self.filigranne, str):
                 filigranne = self.filigranne  # same for all pages
             else:
                 filigranne = self.filigranne.get(doc.page, None)
diff --git a/misc/extract_code_strings.py b/misc/extract_code_strings.py
index a8a41f45c4..ad16304d69 100755
--- a/misc/extract_code_strings.py
+++ b/misc/extract_code_strings.py
@@ -26,7 +26,7 @@ for srcfilename in sys.argv[1:]:
         # L.extend(x.s.strip() for x in ast.walk(p) if x.__class__ == ast.Str)
         for x in ast.walk(p):
             if x.__class__ == ast.Str:
-                if type(x.s) == types.StringType:
+                if isinstance(x.s, str):
                     s = x.s
                 else:
                     s = x.s.encode("UTF-8")