diff --git a/app/but/bulletin_but_pdf.py b/app/but/bulletin_but_pdf.py
index 8a87f900..29b9d674 100644
--- a/app/but/bulletin_but_pdf.py
+++ b/app/but/bulletin_but_pdf.py
@@ -6,15 +6,13 @@
 
 """Génération bulletin BUT au format PDF standard
 """
+from reportlab.lib.colors import blue
+from reportlab.lib.units import cm, mm
 from reportlab.platypus import Paragraph, Spacer
 
-from app.scodoc.sco_pdf import blue, cm, mm
-
+from app.scodoc.sco_bulletins_standard import BulletinGeneratorStandard
 from app.scodoc import gen_tables
 from app.scodoc.sco_codes_parcours import UE_SPORT
-from app.scodoc.sco_utils import fmt_note
-
-from app.scodoc.sco_bulletins_standard import BulletinGeneratorStandard
 
 
 class BulletinGeneratorStandardBUT(BulletinGeneratorStandard):
diff --git a/app/scodoc/sco_bulletins_legacy.py b/app/scodoc/sco_bulletins_legacy.py
index 7d570d07..314abb0d 100644
--- a/app/scodoc/sco_bulletins_legacy.py
+++ b/app/scodoc/sco_bulletins_legacy.py
@@ -34,17 +34,19 @@
  CE FORMAT N'EVOLUERA PLUS ET EST CONSIDERE COMME OBSOLETE.
  
 """
+from reportlab.lib.colors import Color, blue
+from reportlab.lib.units import cm, mm
+from reportlab.platypus import Paragraph, Spacer, Table
 
-import app.scodoc.sco_utils as scu
-from app.scodoc.sco_permissions import Permission
-from app.scodoc import sco_formsemestre
-from app.scodoc import sco_pdf
-from app.scodoc.sco_pdf import Color, Paragraph, Spacer, Table
-from app.scodoc.sco_pdf import blue, cm, mm
-from app.scodoc.sco_pdf import SU
-from app.scodoc import sco_preferences
 from app.scodoc import sco_bulletins_generator
 from app.scodoc import sco_bulletins_pdf
+from app.scodoc import sco_formsemestre
+from app.scodoc.sco_permissions import Permission
+from app.scodoc import sco_pdf
+from app.scodoc.sco_pdf import SU
+from app.scodoc import sco_preferences
+import app.scodoc.sco_utils as scu
+
 
 # Important: Le nom de la classe ne doit pas changer (bien le choisir), car il sera stocké en base de données (dans les préférences)
 class BulletinGeneratorLegacy(sco_bulletins_generator.BulletinGenerator):
diff --git a/app/scodoc/sco_bulletins_ucac.py b/app/scodoc/sco_bulletins_ucac.py
index 2114c60a..fc49ffd9 100644
--- a/app/scodoc/sco_bulletins_ucac.py
+++ b/app/scodoc/sco_bulletins_ucac.py
@@ -32,16 +32,12 @@ On redéfini la table centrale du bulletin de note et hérite de tout le reste d
 
 E. Viennet, juillet 2011
 """
+from reportlab.lib.colors import Color
+from reportlab.lib.units import mm
 
-import app.scodoc.sco_utils as scu
-from app.scodoc.sco_pdf import blue, cm, mm
-from app.scodoc.sco_pdf import Color, Paragraph, Spacer, Table
-
-from app.scodoc import sco_preferences
-
-from app.scodoc import sco_bulletins_generator
 from app.scodoc import sco_bulletins_standard
-from app.scodoc import gen_tables
+from app.scodoc import sco_preferences
+import app.scodoc.sco_utils as scu
 
 
 class BulletinGeneratorUCAC(sco_bulletins_standard.BulletinGeneratorStandard):
diff --git a/app/scodoc/sco_pdf.py b/app/scodoc/sco_pdf.py
index 19a77814..2f468ccf 100755
--- a/app/scodoc/sco_pdf.py
+++ b/app/scodoc/sco_pdf.py
@@ -44,22 +44,17 @@ import traceback
 import unicodedata
 
 import reportlab
-from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Frame, PageBreak
-from reportlab.platypus import Table, TableStyle, Image, KeepInFrame
+from reportlab.pdfgen import canvas
+from reportlab.platypus import Paragraph, Frame
 from reportlab.platypus.flowables import Flowable
 from reportlab.platypus.doctemplate import PageTemplate, BaseDocTemplate
-from reportlab.lib.styles import getSampleStyleSheet
 from reportlab.rl_config import defaultPageSize  # pylint: disable=no-name-in-module
 from reportlab.lib.units import inch, cm, mm
-from reportlab.lib.colors import pink, black, red, blue, green, magenta, red
-from reportlab.lib.colors import Color
-from reportlab.lib.enums import TA_LEFT, TA_RIGHT, TA_CENTER, TA_JUSTIFY
 from reportlab.lib import styles
-from reportlab.lib.pagesizes import letter, A4, landscape
+
 
 from flask import g
 
-import app.scodoc.sco_utils as scu
 from app.scodoc.sco_utils import CONFIG
 from app import log
 from app.scodoc.sco_exceptions import ScoGenError, ScoValueError
@@ -89,6 +84,12 @@ def SU(s):
         return s
 
 
+def get_available_font_names() -> list[str]:
+    """List installed font names"""
+    can = canvas.Canvas(io.StringIO())
+    return can.getAvailableFonts()
+
+
 def _splitPara(txt):
     "split a string, returns a list of <para > ... </para>"
     L = []
@@ -147,12 +148,26 @@ def makeParas(txt, style, suppress_empty=False):
     except Exception as e:
         log(traceback.format_exc())
         log("Invalid pdf para format: %s" % txt)
-        result = [
-            Paragraph(
-                SU('<font color="red"><i>Erreur: format invalide</i></font>'),
-                style,
-            )
-        ]
+        try:
+            result = [
+                Paragraph(
+                    SU('<font color="red"><i>Erreur: format invalide</i></font>'),
+                    style,
+                )
+            ]
+        except ValueError as e:  # probleme font ? essaye sans style
+            # recupere font en cause ?
+            m = re.match(r".*family/bold/italic for (.*)", e.args[0], re.DOTALL)
+            if m:
+                message = f"police non disponible: {m[1]}"
+            else:
+                message = "format invalide"
+            return [
+                Paragraph(
+                    SU(f'<font color="red"><b>Erreur: {message}</b></font>'),
+                    reportlab.lib.styles.ParagraphStyle({}),
+                )
+            ]
     return result
 
 
@@ -166,7 +181,6 @@ def bold_paras(L, tag="b", close=None):
     if hasattr(L, "keys"):
         # L is a dict
         for k in L:
-            x = L[k]
             if k[0] != "_":
                 L[k] = b + L[k] or "" + close
         return L
@@ -256,7 +270,7 @@ class ScoDocPageTemplate(PageTemplate):
         if logo is not None:
             self.background_image_filename = logo.filepath
 
-    def beforeDrawPage(self, canvas, doc):
+    def beforeDrawPage(self, canv, doc):
         """Draws (optional) background, logo and contribution message on each page.
 
         day   : Day of the month as a decimal number [01,31]
@@ -271,10 +285,10 @@ class ScoDocPageTemplate(PageTemplate):
         """
         if not self.preferences:
             return
-        canvas.saveState()
+        canv.saveState()
         # ---- Background image
         if self.background_image_filename and self.with_page_background:
-            canvas.drawImage(
+            canv.drawImage(
                 self.background_image_filename, 0, 0, doc.pagesize[0], doc.pagesize[1]
             )
 
@@ -285,32 +299,32 @@ class ScoDocPageTemplate(PageTemplate):
                 (width, height),
                 image,
             ) = self.logo
-            canvas.drawImage(image, inch, doc.pagesize[1] - inch, width, height)
+            canv.drawImage(image, inch, doc.pagesize[1] - inch, width, height)
 
         # ---- Add some meta data and bookmarks
         if self.pdfmeta_author:
-            canvas.setAuthor(SU(self.pdfmeta_author))
+            canv.setAuthor(SU(self.pdfmeta_author))
         if self.pdfmeta_title:
-            canvas.setTitle(SU(self.pdfmeta_title))
+            canv.setTitle(SU(self.pdfmeta_title))
         if self.pdfmeta_subject:
-            canvas.setSubject(SU(self.pdfmeta_subject))
+            canv.setSubject(SU(self.pdfmeta_subject))
 
         bookmark = self.pagesbookmarks.get(doc.page, None)
         if bookmark:
-            canvas.bookmarkPage(bookmark)
-            canvas.addOutlineEntry(SU(bookmark), bookmark)
+            canv.bookmarkPage(bookmark)
+            canv.addOutlineEntry(SU(bookmark), bookmark)
 
-    def draw_footer(self, canvas, content):
+    def draw_footer(self, canv, content):
         """Print the footer"""
-        canvas.setFont(
+        canv.setFont(
             self.preferences["SCOLAR_FONT"], self.preferences["SCOLAR_FONT_SIZE_FOOT"]
         )
-        canvas.drawString(
+        canv.drawString(
             self.preferences["pdf_footer_x"] * mm,
             self.preferences["pdf_footer_y"] * mm,
             content,
         )
-        canvas.restoreState()
+        canv.restoreState()
 
     def footer_string(self) -> str:
         """String contenu du pied de page"""
@@ -319,14 +333,14 @@ class ScoDocPageTemplate(PageTemplate):
         d["server_url"] = self.server_name
         return SU(self.footer_template % d)
 
-    def afterDrawPage(self, canvas, doc):
+    def afterDrawPage(self, canv, doc):
         if not self.preferences:
             return
         # ---- Footer
         foot_content = None
         if hasattr(doc, "current_footer"):
             foot_content = doc.current_footer
-        self.draw_footer(canvas, foot_content or self.footer_string())
+        self.draw_footer(canv, foot_content or self.footer_string())
         # ---- Filigranne (texte en diagonal en haut a gauche de chaque page)
         filigranne = None
         if hasattr(doc, "filigranne"):
@@ -338,13 +352,13 @@ class ScoDocPageTemplate(PageTemplate):
             else:
                 filigranne = self.filigranne.get(doc.page, None)
         if filigranne:
-            canvas.saveState()
-            canvas.translate(9 * cm, 27.6 * cm)
-            canvas.rotate(30)
-            canvas.scale(4.5, 4.5)
-            canvas.setFillColorRGB(1.0, 0.65, 0.65, alpha=0.6)
-            canvas.drawRightString(0, 0, SU(filigranne))
-            canvas.restoreState()
+            canv.saveState()
+            canv.translate(9 * cm, 27.6 * cm)
+            canv.rotate(30)
+            canv.scale(4.5, 4.5)
+            canv.setFillColorRGB(1.0, 0.65, 0.65, alpha=0.6)
+            canv.drawRightString(0, 0, SU(filigranne))
+            canv.restoreState()
         doc.filigranne = None
 
     def afterPage(self):
@@ -443,8 +457,8 @@ class PDFLock(object):
             return  # deja lock pour ce thread
         try:
             self.Q.put(1, True, self.timeout)
-        except queue.Full:
-            raise ScoGenError(msg="Traitement PDF occupé: ré-essayez")
+        except queue.Full as e:
+            raise ScoGenError(msg="Traitement PDF occupé: ré-essayez") from e
         self.current_thread = threading.get_ident()
         self.nref = 1
         log("PDFLock: granted to %s" % self.current_thread)
@@ -471,7 +485,6 @@ class WatchLock:
     def release(self):
         t = threading.current_thread()
         assert (self.native_id == t.native_id) and (self.ident == t.ident)
-        pass
 
 
 class FakeLock:
diff --git a/app/scodoc/sco_preferences.py b/app/scodoc/sco_preferences.py
index 5d019f7d..7f1d8cc4 100644
--- a/app/scodoc/sco_preferences.py
+++ b/app/scodoc/sco_preferences.py
@@ -121,6 +121,7 @@ from app import log
 from app.scodoc.sco_exceptions import ScoValueError, ScoException
 from app.scodoc.TrivialFormulator import TrivialFormulator
 import app.scodoc.notesdb as ndb
+from app.scodoc import sco_pdf
 import app.scodoc.sco_utils as scu
 
 
@@ -194,6 +195,8 @@ def _get_pref_default_value_from_config(name, pref_spec):
     return value
 
 
+_INSTALLED_FONTS = ", ".join(sco_pdf.get_available_font_names())
+
 PREF_CATEGORIES = (
     # sur page "Paramètres"
     ("general", {}),
@@ -777,7 +780,7 @@ class BasePreferences(object):
                 {
                     "initvalue": "Helvetica",
                     "title": "Police de caractère principale",
-                    "explanation": "pour les pdf (Helvetica est recommandée)",
+                    "explanation": f"pour les pdf (Helvetica est recommandée, parmi {_INSTALLED_FONTS})",
                     "size": 25,
                     "category": "pdf",
                 },
@@ -1140,7 +1143,7 @@ class BasePreferences(object):
                 {
                     "initvalue": "Times-Roman",
                     "title": "Police de caractère pour les PV",
-                    "explanation": "pour les pdf",
+                    "explanation": f"pour les pdf ({_INSTALLED_FONTS})",
                     "size": 25,
                     "category": "pvpdf",
                 },
@@ -1542,7 +1545,7 @@ class BasePreferences(object):
                 {
                     "initvalue": "Times-Roman",
                     "title": "Police titres bulletins",
-                    "explanation": "pour les pdf",
+                    "explanation": f"pour les pdf ({_INSTALLED_FONTS})",
                     "size": 25,
                     "category": "bul",
                 },
diff --git a/app/scodoc/sco_pvpdf.py b/app/scodoc/sco_pvpdf.py
index 2e8cdaf6..3ac0096d 100644
--- a/app/scodoc/sco_pvpdf.py
+++ b/app/scodoc/sco_pvpdf.py
@@ -28,15 +28,13 @@
 """Edition des PV de jury
 """
 import io
-import os
 import re
 
 import reportlab
 from reportlab.lib.units import cm, mm
-from reportlab.lib.enums import TA_LEFT, TA_RIGHT, TA_CENTER, TA_JUSTIFY
-from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Frame, PageBreak
-from reportlab.platypus import Table, TableStyle, Image, KeepInFrame
-from reportlab.platypus.flowables import Flowable
+from reportlab.lib.enums import TA_RIGHT, TA_JUSTIFY
+from reportlab.platypus import Paragraph, Spacer, Frame, PageBreak
+from reportlab.platypus import Table, TableStyle, Image
 from reportlab.platypus.doctemplate import PageTemplate, BaseDocTemplate
 from reportlab.lib.pagesizes import A4, landscape
 from reportlab.lib import styles
@@ -53,7 +51,6 @@ from app.scodoc import sco_preferences
 from app.scodoc import sco_etud
 import sco_version
 from app.scodoc.sco_logos import find_logo
-from app.scodoc.sco_pdf import PDFLOCK
 from app.scodoc.sco_pdf import SU
 
 LOGO_FOOTER_ASPECT = scu.CONFIG.LOGO_FOOTER_ASPECT  # XXX A AUTOMATISER
@@ -317,14 +314,14 @@ class PVTemplate(CourrierIndividuelTemplate):
         self.with_footer = self.preferences["PV_WITH_FOOTER"]
         self.with_page_background = self.preferences["PV_WITH_BACKGROUND"]
 
-    def afterDrawPage(self, canvas, doc):
+    def afterDrawPage(self, canv, doc):
         """Called after all flowables have been drawn on a page"""
         pass
 
-    def beforeDrawPage(self, canvas, doc):
+    def beforeDrawPage(self, canv, doc):
         """Called before any flowables are drawn on a page"""
         # If the page number is even, force a page break
-        CourrierIndividuelTemplate.beforeDrawPage(self, canvas, doc)
+        CourrierIndividuelTemplate.beforeDrawPage(self, canv, doc)
         # Note: on cherche un moyen de generer un saut de page double
         #  (redémarrer sur page impaire, nouvelle feuille en recto/verso). Pas trouvé en Platypus.
         #
diff --git a/app/scodoc/sco_trombino_tours.py b/app/scodoc/sco_trombino_tours.py
index 61d80de2..56261eb9 100644
--- a/app/scodoc/sco_trombino_tours.py
+++ b/app/scodoc/sco_trombino_tours.py
@@ -33,20 +33,23 @@
 import io
 
 from reportlab.lib import colors
-from reportlab.lib import pagesizes
+from reportlab.lib.colors import black
 from reportlab.lib.pagesizes import A4, A3
+from reportlab.lib import styles
+from reportlab.lib.pagesizes import landscape
+from reportlab.lib.units import cm
+from reportlab.platypus import KeepInFrame, Paragraph, Table, TableStyle
+from reportlab.platypus.doctemplate import BaseDocTemplate
 
-import app.scodoc.sco_utils as scu
-from app import log
 from app.scodoc import sco_abs
+from app.scodoc import sco_etud
+from app.scodoc.sco_exceptions import ScoPDFFormatError
 from app.scodoc import sco_groups
 from app.scodoc import sco_groups_view
 from app.scodoc import sco_preferences
 from app.scodoc import sco_trombino
-from app.scodoc import sco_etud
-from app.scodoc.sco_exceptions import ScoPDFFormatError
-from app.scodoc.sco_pdf import *
-
+import app.scodoc.sco_utils as scu
+from app.scodoc.sco_pdf import SU, ScoDocPageTemplate
 
 # Paramétrage de l'aspect graphique:
 PHOTOWIDTH = 2.8 * cm
@@ -55,7 +58,7 @@ N_PER_ROW = 5
 
 
 def pdf_trombino_tours(
-    group_ids=[],  # liste des groupes à afficher
+    group_ids=(),  # liste des groupes à afficher
     formsemestre_id=None,  # utilisé si pas de groupes selectionné
 ):
     """Generation du trombinoscope en fichier PDF"""
@@ -66,7 +69,6 @@ def pdf_trombino_tours(
 
     DeptName = sco_preferences.get_preference("DeptName")
     DeptFullName = sco_preferences.get_preference("DeptFullName")
-    UnivName = sco_preferences.get_preference("UnivName")
     InstituteName = sco_preferences.get_preference("InstituteName")
     # Generate PDF page
     StyleSheet = styles.getSampleStyleSheet()
@@ -143,9 +145,7 @@ def pdf_trombino_tours(
 
     for group_id in groups_infos.group_ids:
         if group_id != "None":
-            members, group, group_tit, sem, nbdem = sco_groups.get_group_infos(
-                group_id, "I"
-            )
+            members, _, group_tit, sem, _ = sco_groups.get_group_infos(group_id, "I")
             groups += " %s" % group_tit
             L = []
             currow = []
@@ -286,14 +286,14 @@ def pdf_trombino_tours(
 
 
 def pdf_feuille_releve_absences(
-    group_ids=[],  # liste des groupes à afficher
+    group_ids=(),  # liste des groupes à afficher
     formsemestre_id=None,  # utilisé si pas de groupes selectionné
 ):
     """Generation de la feuille d'absence en fichier PDF, avec photos"""
 
     NB_CELL_AM = sco_preferences.get_preference("feuille_releve_abs_AM")
     NB_CELL_PM = sco_preferences.get_preference("feuille_releve_abs_PM")
-    COLWIDTH = 0.85 * cm
+    col_width = 0.85 * cm
     if sco_preferences.get_preference("feuille_releve_abs_samedi"):
         days = sco_abs.DAYNAMES[:6]  # Lundi, ..., Samedi
     else:
@@ -307,7 +307,6 @@ def pdf_feuille_releve_absences(
 
     DeptName = sco_preferences.get_preference("DeptName")
     DeptFullName = sco_preferences.get_preference("DeptFullName")
-    UnivName = sco_preferences.get_preference("UnivName")
     InstituteName = sco_preferences.get_preference("InstituteName")
     # Generate PDF page
     StyleSheet = styles.getSampleStyleSheet()
@@ -340,7 +339,7 @@ def pdf_feuille_releve_absences(
     currow = [""] * (NB_CELL_AM + 1 + NB_CELL_PM + 1)
     elem_day = Table(
         [currow],
-        colWidths=([COLWIDTH] * (NB_CELL_AM + 1 + NB_CELL_PM + 1)),
+        colWidths=([col_width] * (NB_CELL_AM + 1 + NB_CELL_PM + 1)),
         style=TableStyle(
             [
                 ("GRID", (0, 0), (NB_CELL_AM - 1, 0), 0.25, black),
@@ -362,7 +361,7 @@ def pdf_feuille_releve_absences(
 
     elem_week = Table(
         W,
-        colWidths=([COLWIDTH * (NB_CELL_AM + 1 + NB_CELL_PM + 1)] * nb_days),
+        colWidths=([col_width * (NB_CELL_AM + 1 + NB_CELL_PM + 1)] * nb_days),
         style=TableStyle(
             [
                 ("LEFTPADDING", (0, 0), (-1, -1), 0),
@@ -378,7 +377,7 @@ def pdf_feuille_releve_absences(
 
     elem_day_name = Table(
         [currow],
-        colWidths=([COLWIDTH * (NB_CELL_AM + 1 + NB_CELL_PM + 1)] * nb_days),
+        colWidths=([col_width * (NB_CELL_AM + 1 + NB_CELL_PM + 1)] * nb_days),
         style=TableStyle(
             [
                 ("LEFTPADDING", (0, 0), (-1, -1), 0),
@@ -390,9 +389,7 @@ def pdf_feuille_releve_absences(
     )
 
     for group_id in groups_infos.group_ids:
-        members, group, group_tit, sem, nbdem = sco_groups.get_group_infos(
-            group_id, "I"
-        )
+        members, _, group_tit, _, _ = sco_groups.get_group_infos(group_id, "I")
         L = []
 
         currow = [
@@ -429,7 +426,10 @@ def pdf_feuille_releve_absences(
             T = Table(
                 L,
                 colWidths=(
-                    [5.0 * cm, (COLWIDTH * (NB_CELL_AM + 1 + NB_CELL_PM + 1) * nb_days)]
+                    [
+                        5.0 * cm,
+                        (col_width * (NB_CELL_AM + 1 + NB_CELL_PM + 1) * nb_days),
+                    ]
                 ),
                 style=TableStyle(
                     [