diff --git a/app/scodoc/sco_bulletins.py b/app/scodoc/sco_bulletins.py
index b19a5fc9d..d8c423208 100644
--- a/app/scodoc/sco_bulletins.py
+++ b/app/scodoc/sco_bulletins.py
@@ -804,64 +804,61 @@ def formsemestre_bulletinetud(
     except:
         return scu.log_unknown_etud(context, REQUEST, format=format)
 
+    bulletin = do_formsemestre_bulletinetud(
+        context,
+        formsemestre_id,
+        etudid,
+        format=format,
+        version=version,
+        xml_with_decisions=xml_with_decisions,
+        force_publishing=force_publishing,
+        prefer_mail_perso=prefer_mail_perso,
+        REQUEST=REQUEST,
+    )[0]
+    if format not in {"html", "pdfmail"}:
+        return bulletin
+
     sem = sco_formsemestre.get_formsemestre(context, formsemestre_id)
+    H = [
+        _formsemestre_bulletinetud_header_html(
+            context, etud, etudid, sem, formsemestre_id, format, version, REQUEST
+        ),
+        bulletin,
+    ]
 
-    R = []
-    if format == "html" or format == "pdfmail":
-        R.append(
-            _formsemestre_bulletinetud_header_html(
-                context, etud, etudid, sem, formsemestre_id, format, version, REQUEST
-            )
+    H.append("""<p>Situation actuelle: """)
+    if etud["inscription_formsemestre_id"]:
+        H.append(
+            """<a class="stdlink" href="formsemestre_status?formsemestre_id=%s">"""
+            % etud["inscription_formsemestre_id"]
         )
-
-    R.append(
-        do_formsemestre_bulletinetud(
-            context,
-            formsemestre_id,
-            etudid,
-            format=format,
-            version=version,
-            xml_with_decisions=xml_with_decisions,
-            force_publishing=force_publishing,
-            prefer_mail_perso=prefer_mail_perso,
-            REQUEST=REQUEST,
-        )[0]
+    H.append(etud["inscriptionstr"])
+    if etud["inscription_formsemestre_id"]:
+        H.append("""</a>""")
+    H.append("""</p>""")
+    if sem["modalite"] == "EXT":
+        H.append(
+            """<p><a 
+        href="formsemestre_ext_edit_ue_validations?formsemestre_id=%s&etudid=%s" 
+        class="stdlink">
+        Editer les validations d'UE dans ce semestre extérieur
+        </a></p>"""
+            % (formsemestre_id, etudid)
+        )
+    # Place du diagramme radar
+    H.append(
+        """<form id="params">
+    <input type="hidden" name="etudid" id="etudid" value="%s"/>
+    <input type="hidden" name="formsemestre_id" id="formsemestre_id" value="%s"/>
+    </form>"""
+        % (etudid, formsemestre_id)
     )
+    H.append('<div id="radar_bulletin"></div>')
 
-    if format == "html" or format == "pdfmail":
-        R.append("""<p>Situation actuelle: """)
-        if etud["inscription_formsemestre_id"]:
-            R.append(
-                """<a class="stdlink" href="formsemestre_status?formsemestre_id=%s">"""
-                % etud["inscription_formsemestre_id"]
-            )
-        R.append(etud["inscriptionstr"])
-        if etud["inscription_formsemestre_id"]:
-            R.append("""</a>""")
-        R.append("""</p>""")
-        if sem["modalite"] == "EXT":
-            R.append(
-                """<p><a 
-            href="formsemestre_ext_edit_ue_validations?formsemestre_id=%s&etudid=%s" 
-            class="stdlink">
-            Editer les validations d'UE dans ce semestre extérieur
-            </a></p>"""
-                % (formsemestre_id, etudid)
-            )
-        # Place du diagramme radar
-        R.append(
-            """<form id="params">
-        <input type="hidden" name="etudid" id="etudid" value="%s"/>
-        <input type="hidden" name="formsemestre_id" id="formsemestre_id" value="%s"/>
-        </form>"""
-            % (etudid, formsemestre_id)
-        )
-        R.append('<div id="radar_bulletin"></div>')
+    # --- Pied de page
+    H.append(html_sco_header.sco_footer(context, REQUEST))
 
-        # --- Pied de page
-        R.append(html_sco_header.sco_footer(context, REQUEST))
-
-    return "".join(R)
+    return "".join(H)
 
 
 def can_send_bulletin_by_mail(context, formsemestre_id, REQUEST):
diff --git a/app/scodoc/sco_bulletins_generator.py b/app/scodoc/sco_bulletins_generator.py
index 70557dfcd..3dafa3e4b 100644
--- a/app/scodoc/sco_bulletins_generator.py
+++ b/app/scodoc/sco_bulletins_generator.py
@@ -42,14 +42,12 @@ La préférence 'bul_pdf_class_name' est obsolete (inutilisée).
 
 
 """
-import time
 import collections
+import io
+import time
 import traceback
 
-try:
-    from io import StringIO  # for Python 3
-except ImportError:
-    from cStringIO import StringIO  # for Python 2
+
 import reportlab
 from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Frame, PageBreak
 from reportlab.platypus import Table, TableStyle, Image, KeepInFrame
@@ -219,7 +217,7 @@ class BulletinGenerator(object):
         else:
             # Generation du document PDF
             sem = sco_formsemestre.get_formsemestre(self.context, formsemestre_id)
-            report = StringIO.StringIO()  # in-memory document, no disk file
+            report = io.BytesIO()  # in-memory document, no disk file
             document = sco_pdf.BaseDocTemplate(report)
             document.addPageTemplates(
                 sco_pdf.ScolarsPageTemplate(
diff --git a/app/scodoc/sco_pdf.py b/app/scodoc/sco_pdf.py
index 2efe95797..36b1ad188 100755
--- a/app/scodoc/sco_pdf.py
+++ b/app/scodoc/sco_pdf.py
@@ -77,16 +77,14 @@ DEFAULT_PDF_FOOTER_TEMPLATE = CONFIG.DEFAULT_PDF_FOOTER_TEMPLATE
 
 
 def SU(s):
-    "convert s from SCO default encoding to UTF8"
-    # Mis en service le 4/11/06, passage à ReportLab 2.0
-    if not s:
-        s = ""
+    "convert s from string to string suitable for ReportLab"
+    # A priori inutile en Python 3, mais tester les "combining accents"
+    return s or ""
     # Remplace caractères composés
     #  eg 'e\xcc\x81' COMBINING ACUTE ACCENT  par '\xc3\xa9' LATIN SMALL LETTER E WITH ACUTE
     # car les "combining accents" ne sont pas traités par ReportLab mais peuvent
     # nous être envoyés par certains navigateurs ou imports
-    u = unicodedata.normalize("NFC", six.text_type(s, SCO_ENCODING, "replace"))
-    return u.encode("utf8")
+    # return unicodedata.normalize("NFC", s)
 
 
 def _splitPara(txt):