diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..ce247d6
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,18 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+-   repo: https://github.com/psf/black
+    rev: 20.8b1
+    hooks:
+    - id: black
+      args: ['--target-version', 'py37', '--skip-string-normalization', '--line-length', '110']
+-   repo: https://github.com/PyCQA/isort
+    rev: 5.7.0
+    hooks:
+    - id: isort
+      args: ['--profile', 'black', '--line-length', '110']
+-   repo: https://github.com/asottile/pyupgrade
+    rev: v2.20.0
+    hooks:
+    - id: pyupgrade
+      args: ['--keep-percent-format', '--py37-plus']
diff --git a/eo_gestion/actions.py b/eo_gestion/actions.py
index 9621567..29b1dfb 100644
--- a/eo_gestion/actions.py
+++ b/eo_gestion/actions.py
@@ -15,9 +15,9 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import csv
-from io import BytesIO
 import os
 import zipfile
+from io import BytesIO
 
 from django.core.exceptions import PermissionDenied
 from django.http import HttpResponse
@@ -65,7 +65,7 @@ def export_references_as_fodt(modeladmin, request, queryset):
     output_filename = 'references.fodt'
     mimetype = 'application/vnd.oasis.opendocument.text'
 
-    t = Template(open(template, 'r').read())
+    t = Template(open(template).read())
     export = t.render(Context(context)).encode('utf-8')
 
     response = HttpResponse(content=export, content_type=mimetype)
diff --git a/eo_gestion/admin.py b/eo_gestion/admin.py
index f3149c0..3ff9f41 100644
--- a/eo_gestion/admin.py
+++ b/eo_gestion/admin.py
@@ -14,17 +14,16 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import taggit.admin
 from django.conf import settings
 from django.contrib import admin
 from django.contrib.auth import REDIRECT_FIELD_NAME
-from django.contrib.auth.models import User, Group
-from django.contrib.auth.admin import UserAdmin, GroupAdmin
+from django.contrib.auth.admin import GroupAdmin, UserAdmin
+from django.contrib.auth.models import Group, User
 from django.http import HttpResponseRedirect
 from django.utils.http import urlencode
 from django.views.decorators.cache import never_cache
 
-import taggit.admin
-
 
 class EOGestionAdminSite(admin.AdminSite):
     @never_cache
@@ -32,18 +31,18 @@ class EOGestionAdminSite(admin.AdminSite):
         if "mellon" in settings.INSTALLED_APPS:
             next_url = request.GET.get(REDIRECT_FIELD_NAME, settings.LOGIN_REDIRECT_URL or "/")
             query = urlencode({REDIRECT_FIELD_NAME: next_url})
-            url = "/accounts/mellon/login/?{0}".format(query)
+            url = f"/accounts/mellon/login/?{query}"
             return HttpResponseRedirect(url)
-        return super(EOGestionAdminSite, self).login(request, extra_context=extra_context)
+        return super().login(request, extra_context=extra_context)
 
     @never_cache
     def logout(self, request, extra_context=None):
         if "mellon" in settings.INSTALLED_APPS:
             next_url = request.GET.get(REDIRECT_FIELD_NAME, settings.LOGIN_REDIRECT_URL or "/")
             query = urlencode({REDIRECT_FIELD_NAME: next_url})
-            url = "/accounts/mellon/logout/?{0}".format(query)
+            url = f"/accounts/mellon/logout/?{query}"
             return HttpResponseRedirect(url)
-        return super(EOGestionAdminSite, self).logout(request, extra_context=extra_context)
+        return super().logout(request, extra_context=extra_context)
 
 
 site = EOGestionAdminSite()
diff --git a/eo_gestion/chorus/admin.py b/eo_gestion/chorus/admin.py
index 6002a1e..7c66bfc 100644
--- a/eo_gestion/chorus/admin.py
+++ b/eo_gestion/chorus/admin.py
@@ -15,6 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from django.contrib import admin
+
 import eo_gestion.admin
 
 from . import models
diff --git a/eo_gestion/chorus/annuaire.py b/eo_gestion/chorus/annuaire.py
index 2e6e38a..5a3eee7 100644
--- a/eo_gestion/chorus/annuaire.py
+++ b/eo_gestion/chorus/annuaire.py
@@ -15,14 +15,12 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import itertools
-import zipfile
-
-from xml.dom import pulldom
 import xml.etree.ElementTree as ET
-
-from django.core.files.storage import default_storage
+import zipfile
+from xml.dom import pulldom
 
 import requests
+from django.core.files.storage import default_storage
 
 from . import chorus
 
@@ -34,7 +32,7 @@ def grouper(iterable, n, fillvalue=None):
     return itertools.zip_longest(*args, fillvalue=fillvalue)
 
 
-class AnnuaireManager(object):
+class AnnuaireManager:
     STRUCTURE_UNITAIRE_TAG_NAME = 'CPPStructurePartenaireUnitaire'
 
     def _update_annuaire(self):
@@ -48,7 +46,7 @@ class AnnuaireManager(object):
             structures = [struct for struct in structures if struct]  # ignore None
             inserts = []
             updates = []
-            identifiers = set(structure.full_identifier for structure in structures)
+            identifiers = {structure.full_identifier for structure in structures}
             known.update(identifiers)
             known_structures = {
                 struct.full_identifier: struct
diff --git a/eo_gestion/chorus/chorus.py b/eo_gestion/chorus/chorus.py
index 087d44a..8170765 100644
--- a/eo_gestion/chorus/chorus.py
+++ b/eo_gestion/chorus/chorus.py
@@ -17,11 +17,10 @@
 import base64
 import logging
 
+import requests
 from django.conf import settings
 from django.utils.encoding import force_text
 
-import requests
-
 from eo_gestion.decorators import cache
 
 logger = logging.getLogger(__name__)
diff --git a/eo_gestion/chorus/migrations/0001_initial.py b/eo_gestion/chorus/migrations/0001_initial.py
index 81326c9..a6faac2 100644
--- a/eo_gestion/chorus/migrations/0001_initial.py
+++ b/eo_gestion/chorus/migrations/0001_initial.py
@@ -1,6 +1,7 @@
 # Generated by Django 2.2.9 on 2020-02-04 09:08
 
 from django.db import migrations, models
+
 import eo_gestion.chorus.validators
 
 
@@ -31,7 +32,9 @@ class Migration(migrations.Migration):
                 ('email', models.EmailField(max_length=254, null=True)),
                 ('engagement_obligatoire', models.BooleanField()),
             ],
-            options={'ordering': ('name', 'service_name'),},
+            options={
+                'ordering': ('name', 'service_name'),
+            },
         ),
         migrations.CreateModel(
             name='Update',
@@ -46,6 +49,7 @@ class Migration(migrations.Migration):
             ],
         ),
         migrations.AddIndex(
-            model_name='structure', index=models.Index(fields=['name', 'service_name'], name='name_idx'),
+            model_name='structure',
+            index=models.Index(fields=['name', 'service_name'], name='name_idx'),
         ),
     ]
diff --git a/eo_gestion/chorus/models.py b/eo_gestion/chorus/models.py
index 8fbafcb..f96e9d9 100644
--- a/eo_gestion/chorus/models.py
+++ b/eo_gestion/chorus/models.py
@@ -20,22 +20,30 @@ from .validators import validate_siret
 
 
 class Update(models.Model):
-    timestamp = models.DateTimeField(auto_now_add=True,)
-    success = models.BooleanField(default=False,)
+    timestamp = models.DateTimeField(
+        auto_now_add=True,
+    )
+    success = models.BooleanField(
+        default=False,
+    )
     message = models.TextField()
 
 
 class Structure(models.Model):
     name = models.CharField(max_length=80)
     full_identifier = models.CharField(max_length=len('29202001300010') + 64, unique=True)
-    siret = models.CharField(max_length=len('29202001300010'), validators=[validate_siret], db_index=True,)
+    siret = models.CharField(
+        max_length=len('29202001300010'),
+        validators=[validate_siret],
+        db_index=True,
+    )
     service_code = models.CharField(max_length=64, default='', blank=True)
     service_name = models.CharField(max_length=80, default='', blank=True)
     email = models.EmailField(null=True)
     engagement_obligatoire = models.BooleanField()
 
     def __init__(self, *args, **kwargs):
-        super(Structure, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
         if not self.full_identifier:
             self.full_identifier = (self.siret + self.service_code)[: len('29202001300010') + 64]
 
diff --git a/eo_gestion/eo_banque/admin.py b/eo_gestion/eo_banque/admin.py
index 3dfbdd5..c26f585 100644
--- a/eo_gestion/eo_banque/admin.py
+++ b/eo_gestion/eo_banque/admin.py
@@ -17,11 +17,12 @@
 
 from django.contrib import admin
 from django.contrib.contenttypes.admin import GenericStackedInline
-from django.db.models import Sum, F, Q
+from django.db.models import F, Q, Sum
 
+from .. import actions
+from .. import admin as eo_gestion_admin
 from ..eo_facture.admin import PaymentInline
 from ..eo_facture.templatetags.eo_facture import amountformat
-from .. import actions, admin as eo_gestion_admin
 from . import models
 
 
@@ -83,7 +84,7 @@ class LigneBanquePopAdmin(admin.ModelAdmin):
         return True
 
     def get_queryset(self, request):
-        qs = super(LigneBanquePopAdmin, self).get_queryset(request)
+        qs = super().get_queryset(request)
         qs = qs.prefetch_related("payments")
         return qs
 
diff --git a/eo_gestion/eo_banque/management/commands/load-csv-banquepop.py b/eo_gestion/eo_banque/management/commands/load-csv-banquepop.py
index 468eef7..a7efabd 100644
--- a/eo_gestion/eo_banque/management/commands/load-csv-banquepop.py
+++ b/eo_gestion/eo_banque/management/commands/load-csv-banquepop.py
@@ -8,10 +8,10 @@ from eo_gestion.eo_banque.models import LigneBanquePop
 
 
 class Command(BaseCommand):
-    '''
-       Charge un fichier CSV exporté depuis notre banque en ligne Banque
-       Populaire
-    '''
+    """
+    Charge un fichier CSV exporté depuis notre banque en ligne Banque
+    Populaire
+    """
 
     can_import_django_settings = True
     output_transaction = True
@@ -39,7 +39,7 @@ class Command(BaseCommand):
 
     def load_one_file(self, csv_file_path):
         for delimiter in [";", "\t"]:
-            csv_file = open(csv_file_path, 'r', encoding='latin1')
+            csv_file = open(csv_file_path, encoding='latin1')
             csv_lines = csv.reader(csv_file, delimiter=delimiter)
             first_line = next(csv_lines)
             if first_line == self.HEADER:
diff --git a/eo_gestion/eo_banque/management/commands/nouveau-solde.py b/eo_gestion/eo_banque/management/commands/nouveau-solde.py
index 438d7f6..9f21b82 100644
--- a/eo_gestion/eo_banque/management/commands/nouveau-solde.py
+++ b/eo_gestion/eo_banque/management/commands/nouveau-solde.py
@@ -7,9 +7,9 @@ from eo_gestion.eo_banque.models import SoldeBanquePop
 
 
 class Command(BaseCommand):
-    '''
-       Charge un fichier CSV exporté depuis notre banque en ligne Baneque Populaire
-    '''
+    """
+    Charge un fichier CSV exporté depuis notre banque en ligne Baneque Populaire
+    """
 
     can_import_django_settings = True
     output_transaction = True
diff --git a/eo_gestion/eo_banque/management/commands/solde.py b/eo_gestion/eo_banque/management/commands/solde.py
index 16902db..7c159b5 100644
--- a/eo_gestion/eo_banque/management/commands/solde.py
+++ b/eo_gestion/eo_banque/management/commands/solde.py
@@ -1,4 +1,4 @@
-from datetime import timedelta, date, datetime
+from datetime import date, datetime, timedelta
 
 from django.core.management.base import BaseCommand
 from django.db import transaction
@@ -7,9 +7,9 @@ from eo_gestion.eo_banque.models import solde
 
 
 class Command(BaseCommand):
-    '''
-       Charge un fichier CSV exporté depuis notre banque en ligne Banque Populaire
-    '''
+    """
+    Charge un fichier CSV exporté depuis notre banque en ligne Banque Populaire
+    """
 
     can_import_django_settings = True
     output_transaction = True
diff --git a/eo_gestion/eo_banque/migrations/0001_initial.py b/eo_gestion/eo_banque/migrations/0001_initial.py
index 819d2ba..bf72023 100644
--- a/eo_gestion/eo_banque/migrations/0001_initial.py
+++ b/eo_gestion/eo_banque/migrations/0001_initial.py
@@ -1,4 +1,4 @@
-from django.db import models, migrations
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
@@ -57,8 +57,8 @@ class Migration(migrations.Migration):
         ),
         migrations.AlterUniqueTogether(
             name='lignebanquepop',
-            unique_together=set(
-                [('compte', 'date_comptabilisation', 'date_operation', 'libelle', 'reference', 'montant')]
-            ),
+            unique_together={
+                ('compte', 'date_comptabilisation', 'date_operation', 'libelle', 'reference', 'montant')
+            },
         ),
     ]
diff --git a/eo_gestion/eo_banque/models.py b/eo_gestion/eo_banque/models.py
index 6c7ade8..972f03c 100644
--- a/eo_gestion/eo_banque/models.py
+++ b/eo_gestion/eo_banque/models.py
@@ -16,9 +16,9 @@
 
 from datetime import date
 
-from django.db import models
 from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
+from django.db import models
 from django.utils import six
 
 
@@ -44,7 +44,6 @@ def solde(t=None):
     return m
 
 
-@six.python_2_unicode_compatible
 class Commentaire(models.Model):
     contenu = models.TextField()
     content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
@@ -56,11 +55,10 @@ class Commentaire(models.Model):
         return "Commentaire créé le %s" % self.creation
 
 
-@six.python_2_unicode_compatible
 class LigneBanquePop(models.Model):
-    '''
-       Une ligne de notre relevé de compte Banque Populaire
-    '''
+    """
+    Une ligne de notre relevé de compte Banque Populaire
+    """
 
     compte = models.CharField(max_length=20)
     date_comptabilisation = models.DateField()
@@ -79,13 +77,13 @@ class LigneBanquePop(models.Model):
         return "%(date_valeur)s %(libelle)s %(montant)s" % self.__dict__
 
     def montant_non_affecte(self):
-        return self.montant - sum([x.montant_affecte for x in self.payments.all()])
+        return self.montant - sum(x.montant_affecte for x in self.payments.all())
 
 
 class SoldeBanquePop(models.Model):
-    '''
-       Le solde à un temps T, permet de calculer notre solde à toute date
-    '''
+    """
+    Le solde à un temps T, permet de calculer notre solde à toute date
+    """
 
     compte = models.CharField(max_length=20)
     date = models.DateField(auto_now_add=True)
diff --git a/eo_gestion/eo_banque/templatetags/eo_banque.py b/eo_gestion/eo_banque/templatetags/eo_banque.py
index aff824e..08c866d 100644
--- a/eo_gestion/eo_banque/templatetags/eo_banque.py
+++ b/eo_gestion/eo_banque/templatetags/eo_banque.py
@@ -21,8 +21,8 @@ from django import template
 from django.db.models import Sum
 from django.urls import reverse
 
-from ..models import LigneBanquePop, solde
 from ...decorators import cache
+from ..models import LigneBanquePop, solde
 
 register = template.Library()
 
@@ -84,8 +84,8 @@ def finances(month=3):
 def total(context):
     qs = context["cl"].get_queryset(context["request"])
     ls = [ligne[0] for ligne in qs.values_list("montant")]
-    credit = sum([montant for montant in ls if montant > 0])
-    debit = sum([montant for montant in ls if montant < 0])
+    credit = sum(montant for montant in ls if montant > 0)
+    debit = sum(montant for montant in ls if montant < 0)
     total = sum(ls)
     return {'credit': credit, 'debit': debit, 'total': total}
 
diff --git a/eo_gestion/eo_facture/admin.py b/eo_gestion/eo_facture/admin.py
index f82ae2a..abfe49d 100644
--- a/eo_gestion/eo_facture/admin.py
+++ b/eo_gestion/eo_facture/admin.py
@@ -17,35 +17,35 @@
 
 import datetime as dt
 
-from django.contrib import admin
+import django.http as http
+from adminsortable2.admin import SortableInlineAdminMixin
 from django.conf.urls import url
+from django.contrib import admin
+from django.contrib.admin.options import BaseModelAdmin
+from django.contrib.humanize.templatetags.humanize import ordinal
+from django.db.models import TextField
+from django.forms import Textarea
+from django.forms.models import BaseInlineFormSet
 from django.shortcuts import render
 from django.urls import reverse
-from django.contrib.admin.options import BaseModelAdmin
-from django.db.models import TextField
-import django.http as http
-from django.contrib.humanize.templatetags.humanize import ordinal
-from django.forms.models import BaseInlineFormSet
-from django.forms import Textarea
 from django.utils.html import format_html
 from django.utils.six import BytesIO
 
-from adminsortable2.admin import SortableInlineAdminMixin
-
-from .. import ods, actions
-from . import forms, models, views
-from .templatetags.eo_facture import amountformat
 import eo_gestion.admin
 
+from .. import actions, ods
+from . import forms, models, views
+from .templatetags.eo_facture import amountformat
 
-class LookupAllowed(object):
+
+class LookupAllowed:
     def lookup_allowed(self, *args, **kwargs):
         return True
 
 
-class SelectRelatedMixin(object):
+class SelectRelatedMixin:
     def get_queryset(self, request):
-        qs = super(SelectRelatedMixin, self).get_queryset(request)
+        qs = super().get_queryset(request)
         return qs.select_related()
 
 
@@ -55,7 +55,7 @@ class CommonPaymentInline(BaseModelAdmin):
             kwargs['queryset'] = models.Facture.objects.avec_solde()
         if db_field.name == 'ligne_banque_pop' and request.path.endswith('/add/'):
             kwargs['queryset'] = models.encaissements_avec_solde_non_affecte()
-        return super(CommonPaymentInline, self).formfield_for_foreignkey(db_field, request, **kwargs)
+        return super().formfield_for_foreignkey(db_field, request, **kwargs)
 
 
 class PrestationInline(SelectRelatedMixin, admin.TabularInline):
@@ -70,7 +70,7 @@ class FactureInline(SelectRelatedMixin, admin.TabularInline):
 
 class PaymentInlineFormset(BaseInlineFormSet):
     def __init__(self, *args, **kwargs):
-        super(PaymentInlineFormset, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
         for form in self.forms:
             if form.instance.id is None:
                 field = form.fields["ligne_banque_pop"]
@@ -135,7 +135,7 @@ class ClientAdmin(admin.ModelAdmin):
     raw_id_fields = ['chorus_structure']
 
     def get_readonly_fields(self, request, obj=None):
-        readonly_fields = super(ClientAdmin, self).get_readonly_fields(request, obj=obj)
+        readonly_fields = super().get_readonly_fields(request, obj=obj)
         if obj and obj.chorus_structure:
             readonly_fields += ('siret', 'service_code')
         return readonly_fields
@@ -186,7 +186,7 @@ class ContratAdmin(LookupAllowed, admin.ModelAdmin):
     column_montant.short_description = 'Montant'
 
     def get_queryset(self, request):
-        qs = super(ContratAdmin, self).get_queryset(request)
+        qs = super().get_queryset(request)
         return qs.prefetch_related('prestations', 'factures__lignes', 'tags')
 
     def tag_list(self, obj):
@@ -223,7 +223,7 @@ class ContratAdmin(LookupAllowed, admin.ModelAdmin):
         return render(request, "admin/eo_facture/contrat/duplicate.html", context=context)
 
     def get_urls(self):
-        urls = super(ContratAdmin, self).get_urls()
+        urls = super().get_urls()
         duplicate_view = self.admin_site.admin_view(self.duplicate)
         my_urls = [url(r'^(.+)/duplicate/$', duplicate_view, name='eo_facture_contrat_duplicate')]
         return my_urls + urls
@@ -295,7 +295,7 @@ class FactureAdmin(LookupAllowed, admin.ModelAdmin):
     def get_queryset(self, request):
         from django.db import connection
 
-        qs = super(FactureAdmin, self).get_queryset(request)
+        qs = super().get_queryset(request)
         qs = qs.prefetch_related("lignes__facture__client")
         qs = qs.prefetch_related("payments__ligne_banque_pop")
         qs = qs.prefetch_related("contrat__factures")
@@ -359,7 +359,7 @@ class FactureAdmin(LookupAllowed, admin.ModelAdmin):
         return response
 
     def get_urls(self):
-        urls = super(FactureAdmin, self).get_urls()
+        urls = super().get_urls()
         my_urls = [
             url(r'^view/([^/]*)', views.facture),
             url(
@@ -378,7 +378,11 @@ class FactureAdmin(LookupAllowed, admin.ModelAdmin):
                 self.admin_site.admin_view(views.send_to_chorus),
                 name='eo_facture_facture_send_to_chorus',
             ),
-            url(r"^sheet/$", self.admin_site.admin_view(self.sheet), name="eo_facture_facture_sheet",),
+            url(
+                r"^sheet/$",
+                self.admin_site.admin_view(self.sheet),
+                name="eo_facture_facture_sheet",
+            ),
         ]
         return my_urls + urls
 
diff --git a/eo_gestion/eo_facture/facturx.py b/eo_gestion/eo_facture/facturx.py
index 7865617..34da9c7 100644
--- a/eo_gestion/eo_facture/facturx.py
+++ b/eo_gestion/eo_facture/facturx.py
@@ -19,9 +19,8 @@ import os
 import subprocess
 import tempfile
 
-from django.template.loader import render_to_string
-
 import facturx
+from django.template.loader import render_to_string
 
 logger = logging.getLogger(__name__)
 
@@ -50,9 +49,7 @@ def to_pdfa(pdf_bytes: bytes, icc_profile: str = DEFAULT_ICC_PROFILE):
             input_fd.name,
         ]
         logger.debug('converting to PDF/A, calling %s', args)
-        completed = subprocess.run(
-            args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True, check=False
-        )
+        completed = subprocess.run(args, capture_output=True, text=True, check=False)
         logger.debug('ghostscript result %s', completed)
         if completed.returncode != 0:
             logger.error('ghostcript call failed %s', completed)
diff --git a/eo_gestion/eo_facture/fields.py b/eo_gestion/eo_facture/fields.py
index 70df4c7..4bd78ae 100644
--- a/eo_gestion/eo_facture/fields.py
+++ b/eo_gestion/eo_facture/fields.py
@@ -17,17 +17,17 @@
 
 from decimal import Decimal, InvalidOperation
 
-from django.core.exceptions import ValidationError
-from django.core import validators
-from django.db import models
 from django import forms
-from django.utils.translation import ugettext_lazy as _
+from django.core import validators
+from django.core.exceptions import ValidationError
+from django.db import models
 from django.utils.six import text_type
+from django.utils.translation import ugettext_lazy as _
 
 
 class PercentagePerYear(list):
     def __init__(self, sequence):
-        super(PercentagePerYear, self).__init__(sequence)
+        super().__init__(sequence)
 
     def __str__(self):
         return ','.join(map(lambda p: ':'.join(map(str, [p[0], int(100 * p[1])])), self))
@@ -37,7 +37,7 @@ class EuroField(models.DecimalField):
     def __init__(self, *args, **kwargs):
         kwargs["max_digits"] = 8
         kwargs["decimal_places"] = 2
-        super(EuroField, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
 
 
 def assertion_error_to_validation_error(fun):
@@ -105,7 +105,7 @@ class PercentagePerYearField(models.Field):
 
     def __init__(self, *args, **kwargs):
         kwargs["max_length"] = 64
-        super(PercentagePerYearField, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
 
     def from_db_value(self, value, expression, connection, context):
         return self.to_python(value)
@@ -143,4 +143,4 @@ class PercentagePerYearField(models.Field):
     def formfield(self, **kwargs):
         defaults = {"form_class": PercentagePerYearFormField}
         defaults.update(kwargs)
-        return super(PercentagePerYearField, self).formfield(**kwargs)
+        return super().formfield(**kwargs)
diff --git a/eo_gestion/eo_facture/forms.py b/eo_gestion/eo_facture/forms.py
index 7da5253..f1527a2 100644
--- a/eo_gestion/eo_facture/forms.py
+++ b/eo_gestion/eo_facture/forms.py
@@ -19,9 +19,9 @@ import datetime
 from decimal import Decimal
 
 from django import forms
-from django.db.transaction import atomic
-from django.core.exceptions import ValidationError
 from django.contrib.admin import widgets
+from django.core.exceptions import ValidationError
+from django.db.transaction import atomic
 
 from . import models
 
@@ -37,7 +37,7 @@ class RapidFactureForm(forms.Form):
 
     def __init__(self, request=None, *args, **kwargs):
         self.request = request
-        super(RapidFactureForm, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
 
     @atomic
     def clean(self):
@@ -89,7 +89,7 @@ class DuplicateContractForm(forms.Form):
 
     def __init__(self, request=None, *args, **kwargs):
         self.request = request
-        super(DuplicateContractForm, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
 
     @atomic
     def clean(self):
diff --git a/eo_gestion/eo_facture/migrations/0001_initial.py b/eo_gestion/eo_facture/migrations/0001_initial.py
index e517c34..93993fd 100644
--- a/eo_gestion/eo_facture/migrations/0001_initial.py
+++ b/eo_gestion/eo_facture/migrations/0001_initial.py
@@ -1,10 +1,12 @@
-from django.db import models, migrations
 import datetime
-import eo_gestion.eo_facture.models
-import eo_gestion.eo_facture.fields
 from decimal import Decimal
-from django.conf import settings
+
 import django.core.validators
+from django.conf import settings
+from django.db import migrations, models
+
+import eo_gestion.eo_facture.fields
+import eo_gestion.eo_facture.models
 
 
 class Migration(migrations.Migration):
@@ -46,11 +48,16 @@ class Migration(migrations.Migration):
                 (
                     'tva',
                     models.DecimalField(
-                        default=Decimal('20'), verbose_name='TVA par défaut', max_digits=8, decimal_places=2,
+                        default=Decimal('20'),
+                        verbose_name='TVA par défaut',
+                        max_digits=8,
+                        decimal_places=2,
                     ),
                 ),
             ],
-            options={'ordering': ('nom',),},
+            options={
+                'ordering': ('nom',),
+            },
             bases=(models.Model,),
         ),
         migrations.CreateModel(
@@ -87,7 +94,9 @@ class Migration(migrations.Migration):
                     ),
                 ),
             ],
-            options={'ordering': ('-id',),},
+            options={
+                'ordering': ('-id',),
+            },
             bases=(models.Model,),
         ),
         migrations.CreateModel(
@@ -168,7 +177,9 @@ class Migration(migrations.Migration):
                     ),
                 ),
             ],
-            options={'ordering': ('-id',),},
+            options={
+                'ordering': ('-id',),
+            },
             bases=(models.Model,),
         ),
         migrations.CreateModel(
@@ -193,7 +204,9 @@ class Migration(migrations.Migration):
                     ),
                 ),
             ],
-            options={'ordering': ('order',),},
+            options={
+                'ordering': ('order',),
+            },
             bases=(models.Model,),
         ),
         migrations.CreateModel(
@@ -230,7 +243,10 @@ class Migration(migrations.Migration):
                     ),
                 ),
             ],
-            options={'ordering': ('-ligne_banque_pop__date_valeur',), 'verbose_name': 'Paiement',},
+            options={
+                'ordering': ('-ligne_banque_pop__date_valeur',),
+                'verbose_name': 'Paiement',
+            },
             bases=(models.Model,),
         ),
         migrations.CreateModel(
@@ -251,7 +267,9 @@ class Migration(migrations.Migration):
                     ),
                 ),
             ],
-            options={'ordering': ('contrat', 'id'),},
+            options={
+                'ordering': ('contrat', 'id'),
+            },
             bases=(models.Model,),
         ),
     ]
diff --git a/eo_gestion/eo_facture/migrations/0002_facture_account_on_previous_period.py b/eo_gestion/eo_facture/migrations/0002_facture_account_on_previous_period.py
index 1314b3a..de8a8b8 100644
--- a/eo_gestion/eo_facture/migrations/0002_facture_account_on_previous_period.py
+++ b/eo_gestion/eo_facture/migrations/0002_facture_account_on_previous_period.py
@@ -1,4 +1,4 @@
-from django.db import models, migrations
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
diff --git a/eo_gestion/eo_facture/migrations/0006_client_contacts.py b/eo_gestion/eo_facture/migrations/0006_client_contacts.py
index 3e97487..97514af 100644
--- a/eo_gestion/eo_facture/migrations/0006_client_contacts.py
+++ b/eo_gestion/eo_facture/migrations/0006_client_contacts.py
@@ -11,6 +11,8 @@ class Migration(migrations.Migration):
 
     operations = [
         migrations.AddField(
-            model_name='client', name='contacts', field=models.TextField(blank=True, verbose_name='Contacts'),
+            model_name='client',
+            name='contacts',
+            field=models.TextField(blank=True, verbose_name='Contacts'),
         ),
     ]
diff --git a/eo_gestion/eo_facture/migrations/0007_auto_20191009_1335.py b/eo_gestion/eo_facture/migrations/0007_auto_20191009_1335.py
index b622bdc..9cc7aaa 100644
--- a/eo_gestion/eo_facture/migrations/0007_auto_20191009_1335.py
+++ b/eo_gestion/eo_facture/migrations/0007_auto_20191009_1335.py
@@ -16,6 +16,7 @@
 
 
 from decimal import Decimal
+
 from django.db import migrations, models
 
 
diff --git a/eo_gestion/eo_facture/migrations/0008_auto_20200201_1559.py b/eo_gestion/eo_facture/migrations/0008_auto_20200201_1559.py
index 8e124a5..df93bab 100644
--- a/eo_gestion/eo_facture/migrations/0008_auto_20200201_1559.py
+++ b/eo_gestion/eo_facture/migrations/0008_auto_20200201_1559.py
@@ -1,6 +1,7 @@
 # Generated by Django 2.2.9 on 2020-02-01 14:59
 
 from django.db import migrations, models
+
 import eo_gestion.eo_facture.validators
 
 
diff --git a/eo_gestion/eo_facture/migrations/0009_client_chorus_structure.py b/eo_gestion/eo_facture/migrations/0009_client_chorus_structure.py
index 2619459..8165c72 100644
--- a/eo_gestion/eo_facture/migrations/0009_client_chorus_structure.py
+++ b/eo_gestion/eo_facture/migrations/0009_client_chorus_structure.py
@@ -1,7 +1,7 @@
 # Generated by Django 2.2.9 on 2020-02-01 15:00
 
-from django.db import migrations, models
 import django.db.models.deletion
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
diff --git a/eo_gestion/eo_facture/migrations/0011_contrat_url.py b/eo_gestion/eo_facture/migrations/0011_contrat_url.py
index 2ad6523..9271f55 100644
--- a/eo_gestion/eo_facture/migrations/0011_contrat_url.py
+++ b/eo_gestion/eo_facture/migrations/0011_contrat_url.py
@@ -11,6 +11,8 @@ class Migration(migrations.Migration):
 
     operations = [
         migrations.AddField(
-            model_name='contrat', name='url', field=models.URLField(blank=True, verbose_name='URL'),
+            model_name='contrat',
+            name='url',
+            field=models.URLField(blank=True, verbose_name='URL'),
         ),
     ]
diff --git a/eo_gestion/eo_facture/migrations/0012_client_active.py b/eo_gestion/eo_facture/migrations/0012_client_active.py
index 30100b6..d096662 100644
--- a/eo_gestion/eo_facture/migrations/0012_client_active.py
+++ b/eo_gestion/eo_facture/migrations/0012_client_active.py
@@ -11,6 +11,8 @@ class Migration(migrations.Migration):
 
     operations = [
         migrations.AddField(
-            model_name='client', name='active', field=models.BooleanField(default=True, verbose_name='Actif'),
+            model_name='client',
+            name='active',
+            field=models.BooleanField(default=True, verbose_name='Actif'),
         ),
     ]
diff --git a/eo_gestion/eo_facture/migrations/0013_contrat_tags.py b/eo_gestion/eo_facture/migrations/0013_contrat_tags.py
index 78526c7..969d4af 100644
--- a/eo_gestion/eo_facture/migrations/0013_contrat_tags.py
+++ b/eo_gestion/eo_facture/migrations/0013_contrat_tags.py
@@ -1,6 +1,7 @@
 # Generated by Django 2.2.9 on 2020-07-04 14:55
 
 from django.db import migrations
+
 import eo_gestion.eo_facture.taggit
 
 
diff --git a/eo_gestion/eo_facture/models.py b/eo_gestion/eo_facture/models.py
index d5d5288..2f75f51 100644
--- a/eo_gestion/eo_facture/models.py
+++ b/eo_gestion/eo_facture/models.py
@@ -15,29 +15,28 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from decimal import Decimal, ROUND_HALF_UP
 import datetime
 from collections import defaultdict
+from decimal import ROUND_HALF_UP, Decimal
 
+from django.conf import settings
 from django.contrib.auth.models import User
 from django.core.exceptions import ValidationError
+from django.core.validators import RegexValidator, validate_email
 from django.db import models
-from django.db.models import Sum, Q, F
-from django.core.validators import validate_email, RegexValidator
-from django.conf import settings
-from django.db.models.signals import post_save, post_delete
+from django.db.models import F, Q, Sum
 from django.db.models.query import QuerySet
+from django.db.models.signals import post_delete, post_save
 from django.template.loader import get_template
-from django.utils.translation import ugettext_lazy as _
 from django.utils import six
 from django.utils.timezone import now
-
+from django.utils.translation import ugettext_lazy as _
 from weasyprint import HTML
 
+from eo_gestion.utils import percentage_str
 
 from ..eo_banque import models as banque_models
-from . import fields, validators, facturx, taggit
-from eo_gestion.utils import percentage_str
+from . import facturx, fields, taggit, validators
 
 validate_telephone = RegexValidator(r"[. 0-9]*")
 
@@ -52,7 +51,6 @@ def today():
     return now().date()
 
 
-@six.python_2_unicode_compatible
 class Client(models.Model):
     nom = models.CharField(max_length=255, unique=True)
     adresse = models.TextField()
@@ -73,7 +71,12 @@ class Client(models.Model):
         blank=True,
         default='',
     )
-    service_code = models.CharField(max_length=128, db_index=True, blank=True, default='',)
+    service_code = models.CharField(
+        max_length=128,
+        db_index=True,
+        blank=True,
+        default='',
+    )
     active = models.BooleanField(verbose_name='Actif', default=True)
 
     chorus_structure = models.ForeignKey(
@@ -101,7 +104,6 @@ def one_hundred_percent_this_year():
     return "%s:100" % now().date().year
 
 
-@six.python_2_unicode_compatible
 class Contrat(models.Model):
     client = models.ForeignKey(Client, related_name="contrats", on_delete=models.CASCADE)
     intitule = models.CharField(max_length=150)
@@ -123,7 +125,7 @@ class Contrat(models.Model):
     tags = taggit.TaggableManager(blank=True)
 
     def montant_facture(self):
-        return sum([facture.montant for facture in self.factures.non_proforma()])
+        return sum(facture.montant for facture in self.factures.non_proforma())
 
     def pourcentage_facture(self):
         return percentage_str(self.montant_facture(), self.montant())
@@ -132,11 +134,11 @@ class Contrat(models.Model):
 
     def montant(self):
         """
-           Montant total d'un contrat, y compris les prestations
-           optionnelles. Si pas de prestation définie, montant des factures émises.
+        Montant total d'un contrat, y compris les prestations
+        optionnelles. Si pas de prestation définie, montant des factures émises.
         """
         if self.prestations.exists():
-            return Decimal(sum([p.montant() for p in self.prestations.all()]))
+            return Decimal(sum(p.montant() for p in self.prestations.all()))
         else:
             return self.montant_facture()
 
@@ -145,7 +147,7 @@ class Contrat(models.Model):
 
     def nom_client(self):
         """
-           Le nom du client qui a signé ce contrat avec EO.
+        Le nom du client qui a signé ce contrat avec EO.
         """
         return self.client.nom
 
@@ -159,7 +161,6 @@ class Contrat(models.Model):
         ordering = ('-id',)
 
 
-@six.python_2_unicode_compatible
 class Prestation(models.Model):
     contrat = models.ForeignKey(Contrat, related_name='prestations', on_delete=models.CASCADE)
     intitule = models.CharField(max_length=255, verbose_name='Intitulé')
@@ -213,7 +214,6 @@ class FactureQuerySet(QuerySet):
         )
 
 
-@six.python_2_unicode_compatible
 class Facture(models.Model):
     proforma = models.BooleanField(default=True, verbose_name='Facture proforma', db_index=True)
     ordre = models.IntegerField(
@@ -274,7 +274,7 @@ class Facture(models.Model):
     def save(self):
         if self.ordre is None and not self.proforma:
             self.ordre = self.last_ordre_plus_one()
-        super(Facture, self).save()
+        super().save()
 
     def clean(self):
         if not (self.contrat or self.client):
@@ -333,7 +333,7 @@ class Facture(models.Model):
 
     @property
     def montant(self):
-        return sum([ligne.montant for ligne in self.lignes.all()])
+        return sum(ligne.montant for ligne in self.lignes.all())
 
     def solde(self):
         payments = self.payments.all()
@@ -395,7 +395,6 @@ class Facture(models.Model):
         ordering = ("-id",)
 
 
-@six.python_2_unicode_compatible
 class Ligne(models.Model):
     facture = models.ForeignKey(Facture, related_name="lignes", on_delete=models.CASCADE)
     intitule = models.TextField(blank=True)
@@ -428,8 +427,8 @@ class Ligne(models.Model):
         if self.facture.contrat and not self.facture.proforma:
             facture = self.facture
             contrat = facture.contrat
-            deja_facture = sum([f.montant for f in contrat.factures.exclude(id=facture.id)])
-            deja_facture += sum([l.montant for l in facture.lignes.all() if l != self])
+            deja_facture = sum(f.montant for f in contrat.factures.exclude(id=facture.id))
+            deja_facture += sum(l.montant for l in facture.lignes.all() if l != self)
             if deja_facture + self.montant > contrat.montant():
                 errors.append(
                     'Cette ligne fait dépasser le montant initial du contrat de %.2f %s'
@@ -442,7 +441,11 @@ class Ligne(models.Model):
         ordering = ("order",)
 
     def __str__(self):
-        return "%s pour %s %s" % (self.intitule, self.montant, self.facture.client.monnaie,)
+        return "%s pour %s %s" % (
+            self.intitule,
+            self.montant,
+            self.facture.client.monnaie,
+        )
 
 
 def encaissements_avec_solde_non_affecte():
@@ -455,7 +458,6 @@ def encaissements_avec_solde_non_affecte():
     )
 
 
-@six.python_2_unicode_compatible
 class Payment(models.Model):
     facture = models.ForeignKey(Facture, related_name='payments', on_delete=models.CASCADE)
     ligne_banque_pop = models.ForeignKey(
@@ -502,7 +504,10 @@ class Payment(models.Model):
             pass
         else:
             deja_affecte = other_payments.aggregate(aggregate).get("montant_affecte") or 0
-            if self.montant_affecte is not None and deja_affecte + self.montant_affecte > self.facture.montant_ttc:
+            if (
+                self.montant_affecte is not None
+                and deja_affecte + self.montant_affecte > self.facture.montant_ttc
+            ):
                 raise ValidationError(
                     'Le montant affecté aux différentes factures '
                     'est supérieur au montant de l\'encaissement.'
diff --git a/eo_gestion/eo_facture/taggit.py b/eo_gestion/eo_facture/taggit.py
index d5cf128..f04fffb 100644
--- a/eo_gestion/eo_facture/taggit.py
+++ b/eo_gestion/eo_facture/taggit.py
@@ -15,7 +15,6 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from django.forms import ModelMultipleChoiceField, SelectMultiple
-
 from taggit.managers import TaggableManager
 from taggit.models import Tag
 
@@ -25,6 +24,7 @@ class TagWidget(SelectMultiple):
 
     class Media:
         '''Enable use of Select2 in template'''
+
         js = [
             'xstatic/jquery.js',
             'xstatic/jquery-ui.js',
@@ -42,9 +42,7 @@ class TagField(ModelMultipleChoiceField):
         if value is None:
             return value
         # TagManager returns Trough model and not the target model, we must adapt
-        if (hasattr(value, '__iter__')
-                and not isinstance(value, str)
-                and not hasattr(value, '_meta')):
+        if hasattr(value, '__iter__') and not isinstance(value, str) and not hasattr(value, '_meta'):
             if value and hasattr(value[0], '_meta'):
                 value = list(value.select_related('tag').values_list('tag__name', flat=True))
             return value
diff --git a/eo_gestion/eo_facture/templatetags/eo_facture.py b/eo_gestion/eo_facture/templatetags/eo_facture.py
index d9f76e0..5a5367d 100644
--- a/eo_gestion/eo_facture/templatetags/eo_facture.py
+++ b/eo_gestion/eo_facture/templatetags/eo_facture.py
@@ -15,21 +15,21 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from datetime import date, timedelta, datetime
-from decimal import Decimal, InvalidOperation
 from collections import defaultdict
+from datetime import date, datetime, timedelta
+from decimal import Decimal, InvalidOperation
 
 from django import template
-from django.dispatch import receiver
 from django.db import transaction
-from django.db.models.signals import post_save, post_delete
-from django.utils.formats import number_format
-from django.utils.timesince import timesince
-from django.utils.six import text_type
+from django.db.models.signals import post_delete, post_save
+from django.dispatch import receiver
 from django.urls import reverse
+from django.utils.formats import number_format
+from django.utils.six import text_type
+from django.utils.timesince import timesince
 
-from eo_gestion.eo_facture.models import Contrat, Facture, DELAI_PAIEMENT, Payment
 from eo_gestion.eo_banque.models import LigneBanquePop
+from eo_gestion.eo_facture.models import DELAI_PAIEMENT, Contrat, Facture, Payment
 from eo_gestion.utils import percentage
 
 from ...decorators import cache
@@ -107,7 +107,8 @@ def income():
     invoiced_clients_by_year = {}
     for year in invoiced_by_year_and_client:
         clients = sorted(
-            invoiced_by_year_and_client[year].keys(), key=lambda x: -invoiced_by_year_and_client[year][x],
+            invoiced_by_year_and_client[year].keys(),
+            key=lambda x: -invoiced_by_year_and_client[year][x],
         )
         invoiced_clients_by_year[year] = clients
     contracted_by_year = defaultdict(lambda: Decimal(0))
@@ -153,7 +154,7 @@ class StringWithHref(text_type):
         return text_type.__new__(cls, v)
 
     def __init__(self, v, href=None):
-        super(StringWithHref, self).__init__()
+        super().__init__()
         self.href = href
 
 
@@ -213,7 +214,7 @@ def income_by_clients(year=None):
     total = sum(total_by_clients.values())
     total_invoiced = sum(invoiced_by_clients.values())
     total_contracted = sum(contracted_by_clients.values())
-    percent_by_clients = dict([(i, Decimal(100) * v / total) for i, v in total_by_clients.items()])
+    percent_by_clients = {i: Decimal(100) * v / total for i, v in total_by_clients.items()}
     clients = sorted(total_by_clients.keys(), key=lambda x: -total_by_clients[x])
     running_total = Decimal(0)
     # compute pareto index
@@ -290,7 +291,7 @@ def a_facturer():
                 }
             )
     contrats_a_facturer.sort(key=lambda x: -x['depuis'])
-    montant = sum([x['montant'] for x in contrats_a_facturer])
+    montant = sum(x['montant'] for x in contrats_a_facturer)
     return {'a_facturer': contrats_a_facturer, 'montant': montant}
 
 
diff --git a/eo_gestion/eo_facture/views.py b/eo_gestion/eo_facture/views.py
index d8f56bb..d877433 100644
--- a/eo_gestion/eo_facture/views.py
+++ b/eo_gestion/eo_facture/views.py
@@ -20,13 +20,14 @@ import logging
 import os.path
 
 from django import http
-from django.shortcuts import get_object_or_404, redirect
 from django.conf import settings
 from django.contrib import messages
 from django.contrib.admin.models import LogEntry
 from django.contrib.contenttypes.models import ContentType
+from django.shortcuts import get_object_or_404, redirect
 
 from eo_gestion.chorus.chorus import push_to_chorus
+
 from .models import Contrat, Facture
 
 logger = logging.getLogger(__name__)
@@ -46,7 +47,8 @@ def facture_pdf(request, facture_id):
         pdf = facture.pdf(base_uri=request.build_absolute_uri('/'))
     if hasattr(settings, 'FACTURE_DIR'):
         filename = os.path.join(
-            settings.FACTURE_DIR, '%s-%s.pdf' % (facture.code(), facture.contrat.client.nom.encode('utf8')),
+            settings.FACTURE_DIR,
+            '%s-%s.pdf' % (facture.code(), facture.contrat.client.nom.encode('utf8')),
         )
         with open(filename, 'wb') as fd:
             fd.write(pdf)
@@ -90,11 +92,11 @@ def send_to_chorus(request, facture_id):
 
         description = ''
         if 'numeroFluxDepot' in response:
-            msg = 'Facture {facture} envoyée à ChorusPro'.format(facture=facture.code())
+            msg = f'Facture {facture.code()} envoyée à ChorusPro'
             for key, value in response.items():
-                description += ' | {key} - {value}'.format(key=key, value=value)
+                description += f' | {key} - {value}'
         else:
-            msg = 'Échec d\'envoi de la facture {facture} à ChorusPro'.format(facture=facture.code())
+            msg = f'Échec d\'envoi de la facture {facture.code()} à ChorusPro'
 
         msg += description
         LogEntry.objects.create(
diff --git a/eo_gestion/mule.py b/eo_gestion/mule.py
index 8a0f16b..82f8aee 100644
--- a/eo_gestion/mule.py
+++ b/eo_gestion/mule.py
@@ -18,10 +18,8 @@
 import logging
 
 import django
-
 from uwsgidecorators import timer
 
-
 django.setup()
 
 logger = logging.getLogger('django.server')
diff --git a/eo_gestion/ods.py b/eo_gestion/ods.py
index 77e70f8..ac7cb76 100644
--- a/eo_gestion/ods.py
+++ b/eo_gestion/ods.py
@@ -14,14 +14,13 @@
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, see <http://www.gnu.org/licenses/>.
 
-from datetime import date, datetime
 import re
 import xml.etree.ElementTree as ET
 import zipfile
+from datetime import date, datetime
 
 from django.utils.encoding import force_text
 
-
 NS = {
     "fo": "urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0",
     "office": "urn:oasis:names:tc:opendocument:xmlns:office:1.0",
@@ -46,7 +45,7 @@ def is_number(value):
     return True
 
 
-class Workbook(object):
+class Workbook:
     def __init__(self):
         self.sheets = []
 
@@ -158,7 +157,7 @@ class Workbook(object):
         z.close()
 
 
-class WorkSheet(object):
+class WorkSheet:
     def __init__(self, workbook, name):
         self.cells = {}
         self.name = name
@@ -184,7 +183,7 @@ class WorkSheet(object):
         return root
 
 
-class WorkCell(object):
+class WorkCell:
     def __init__(self, worksheet, value):
         if value is None:
             value = ""
diff --git a/eo_gestion/settings.py b/eo_gestion/settings.py
index d4104c5..0777b6a 100644
--- a/eo_gestion/settings.py
+++ b/eo_gestion/settings.py
@@ -16,9 +16,8 @@
 
 import os.path
 
-from django.conf import global_settings
-
 import facturx
+from django.conf import global_settings
 
 # Django settings for facturation project.
 
@@ -40,7 +39,12 @@ DATABASES = {
     }
 }
 
-CACHES = {'default': {'BACKEND': 'django.core.cache.backends.db.DatabaseCache', 'LOCATION': 'cache',}}
+CACHES = {
+    'default': {
+        'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
+        'LOCATION': 'cache',
+    }
+}
 
 LOGGING = {
     'version': 1,
@@ -51,10 +55,23 @@ LOGGING = {
             'datefmt': '%Y-%m-%d %a %H:%M:%S',
         },
     },
-    'handlers': {'console': {'level': 'DEBUG', 'class': 'logging.StreamHandler', 'formatter': 'verbose',}},
+    'handlers': {
+        'console': {
+            'level': 'DEBUG',
+            'class': 'logging.StreamHandler',
+            'formatter': 'verbose',
+        }
+    },
     'loggers': {
-        '': {'handlers': ['console'], 'level': 'INFO',},
-        'factur-x': {'level': 'WARNING', 'handlers': [], 'propagate': False,},
+        '': {
+            'handlers': ['console'],
+            'level': 'INFO',
+        },
+        'factur-x': {
+            'level': 'WARNING',
+            'handlers': [],
+            'propagate': False,
+        },
     },
 }
 
@@ -116,7 +133,9 @@ ROOT_URLCONF = "eo_gestion.urls"
 TEMPLATES = [
     {
         'BACKEND': 'django.template.backends.django.DjangoTemplates',
-        'DIRS': [os.path.join(os.path.dirname(__file__), 'templates'),],
+        'DIRS': [
+            os.path.join(os.path.dirname(__file__), 'templates'),
+        ],
         'APP_DIRS': True,
         'OPTIONS': {
             'context_processors': [
diff --git a/eo_gestion/urls.py b/eo_gestion/urls.py
index e1df7c5..ca746be 100644
--- a/eo_gestion/urls.py
+++ b/eo_gestion/urls.py
@@ -15,14 +15,12 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from django.conf.urls import include, url
-
-from django.conf import settings
 import django.contrib.admin
+from django.conf import settings
+from django.conf.urls import include, url
 from django.views.generic.base import RedirectView
 
 from . import admin
-
 from .eo_facture.views import api_references
 
 django.contrib.admin.autodiscover()
diff --git a/eo_gestion/vendor/adminsortable2/admin.py b/eo_gestion/vendor/adminsortable2/admin.py
index bb4afa2..4d17d63 100644
--- a/eo_gestion/vendor/adminsortable2/admin.py
+++ b/eo_gestion/vendor/adminsortable2/admin.py
@@ -1,5 +1,5 @@
-import os
 import json
+import os
 from itertools import chain
 from types import MethodType
 
@@ -19,13 +19,10 @@ from django.db.models.functions import Coalesce
 from django.db.models.signals import post_save, pre_save
 from django.forms import widgets
 from django.forms.models import BaseInlineFormSet
-from django.http import (
-    HttpResponse, HttpResponseBadRequest,
-    HttpResponseNotAllowed, HttpResponseForbidden
-)
+from django.http import HttpResponse, HttpResponseBadRequest, HttpResponseForbidden, HttpResponseNotAllowed
+from django.urls import path, reverse
 from django.utils.safestring import mark_safe
 from django.utils.translation import gettext_lazy as _
-from django.urls import path, reverse
 
 __all__ = ['SortableAdminMixin', 'SortableInlineAdminMixin']
 
@@ -55,12 +52,10 @@ class MovePageActionForm(admin.helpers.ActionForm):
         required=False,
         initial=1,
         widget=widgets.NumberInput(attrs={'id': 'changelist-form-step'}),
-        label=False
+        label=False,
     )
     page = forms.IntegerField(
-        required=False,
-        widget=widgets.NumberInput(attrs={'id': 'changelist-form-page'}),
-        label=False
+        required=False, widget=widgets.NumberInput(attrs={'id': 'changelist-form-page'}), label=False
     )
 
 
@@ -91,7 +86,7 @@ class SortableAdminMixin(SortableAdminBase):
         return [
             os.path.join('adminsortable2', app_label, opts.model_name, 'change_list.html'),
             os.path.join('adminsortable2', app_label, 'change_list.html'),
-            'adminsortable2/change_list.html'
+            'adminsortable2/change_list.html',
         ]
 
     def __init__(self, model, admin_site):
@@ -111,31 +106,22 @@ class SortableAdminMixin(SortableAdminBase):
         # Insert the magic field into the same position as the first occurrence
         # of the default_order_field, or, if not present, at the start
         try:
-            self.default_order_field_index = self.list_display.index(
-                self.default_order_field
-            )
+            self.default_order_field_index = self.list_display.index(self.default_order_field)
         except ValueError:
             self.default_order_field_index = 0
         self.list_display.insert(self.default_order_field_index, '_reorder')
 
         # Remove *all* occurrences of the field from `list_display`
         if self.list_display and self.default_order_field in self.list_display:
-            self.list_display = [
-                f for f in self.list_display if f != self.default_order_field
-            ]
+            self.list_display = [f for f in self.list_display if f != self.default_order_field]
 
         # Remove *all* occurrences of the field from `list_display_links`
         if self.list_display_links and self.default_order_field in self.list_display_links:
-            self.list_display_links = [
-                f for f in self.list_display_links if
-                f != self.default_order_field
-            ]
+            self.list_display_links = [f for f in self.list_display_links if f != self.default_order_field]
 
         # Remove *all* occurrences of the field from `ordering`
         if self.ordering and self.default_order_field in self.ordering:
-            self.ordering = [
-                f for f in self.ordering if f != self.default_order_field
-            ]
+            self.ordering = [f for f in self.ordering if f != self.default_order_field]
         rev_field = '-' + self.default_order_field
         if self.ordering and rev_field in self.ordering:
             self.ordering = [f for f in self.ordering if f != rev_field]
@@ -148,7 +134,7 @@ class SortableAdminMixin(SortableAdminBase):
             path(
                 'adminsortable2_update/',
                 self.admin_site.admin_view(self.update_order),
-                name=self._get_update_url_name()
+                name=self._get_update_url_name(),
             ),
         ]
         return my_urls + super().get_urls()
@@ -209,10 +195,12 @@ class SortableAdminMixin(SortableAdminBase):
     def media(self):
         m = super().media
         if self.enable_sorting:
-            m = m + widgets.Media(js=[
-                'adminsortable2/js/libs/jquery.ui.sortable-1.11.4.js',
-                'adminsortable2/js/list-sortable.js',
-            ])
+            m = m + widgets.Media(
+                js=[
+                    'adminsortable2/js/libs/jquery.ui.sortable-1.11.4.js',
+                    'adminsortable2/js/list-sortable.js',
+                ]
+            )
         return m
 
     def _add_reorder_method(self):
@@ -223,11 +211,13 @@ class SortableAdminMixin(SortableAdminBase):
         This can only be done using a function, since it is not possible
         to add dynamic attributes to bound methods.
         """
+
         def func(this, item):
             html = ''
             if this.enable_sorting:
-                html = '<div class="drag js-reorder-{1}" order="{0}">' \
-                       '&nbsp;</div>'.format(getattr(item, this.default_order_field), item.pk)
+                html = '<div class="drag js-reorder-{1}" order="{0}">' '&nbsp;</div>'.format(
+                    getattr(item, this.default_order_field), item.pk
+                )
             return mark_safe(html)
 
         setattr(func, 'allow_tags', True)
@@ -255,36 +245,37 @@ class SortableAdminMixin(SortableAdminBase):
         endorder = int(request.POST.get('endorder', 0))
         moved_items = list(self._move_item(request, startorder, endorder))
         return HttpResponse(
-            json.dumps(moved_items, cls=DjangoJSONEncoder),
-            content_type='application/json;charset=UTF-8'
+            json.dumps(moved_items, cls=DjangoJSONEncoder), content_type='application/json;charset=UTF-8'
         )
 
     def save_model(self, request, obj, form, change):
         if not change:
-            setattr(
-                obj, self.default_order_field,
-                self.get_max_order(request, obj) + 1
-            )
+            setattr(obj, self.default_order_field, self.get_max_order(request, obj) + 1)
         super().save_model(request, obj, form, change)
 
     def move_to_exact_page(self, request, queryset):
         self._bulk_move(request, queryset, self.EXACT)
+
     move_to_exact_page.short_description = _('Move selected to specific page')
 
     def move_to_back_page(self, request, queryset):
         self._bulk_move(request, queryset, self.BACK)
+
     move_to_back_page.short_description = _('Move selected ... pages back')
 
     def move_to_forward_page(self, request, queryset):
         self._bulk_move(request, queryset, self.FORWARD)
+
     move_to_forward_page.short_description = _('Move selected ... pages forward')
 
     def move_to_first_page(self, request, queryset):
         self._bulk_move(request, queryset, self.FIRST)
+
     move_to_first_page.short_description = _('Move selected to first page')
 
     def move_to_last_page(self, request, queryset):
         self._bulk_move(request, queryset, self.LAST)
+
     move_to_last_page.short_description = _('Move selected to last page')
 
     def _move_item(self, request, startorder, endorder):
@@ -332,10 +323,7 @@ class SortableAdminMixin(SortableAdminBase):
             move_qs = model.objects.filter(**move_filter).order_by(order_by)
             move_objs = list(move_qs)
             for instance in move_objs:
-                setattr(
-                    instance, rank_field,
-                    getattr(instance, rank_field) + move_delta
-                )
+                setattr(instance, rank_field, getattr(instance, rank_field) + move_delta)
                 # Do not run `instance.save()`, because it will be updated
                 # later in bulk by `move_qs.update`.
                 pre_save.send(
@@ -359,10 +347,10 @@ class SortableAdminMixin(SortableAdminBase):
             setattr(obj, rank_field, endorder)
             obj.save(update_fields=[rank_field])
 
-        return [{
-            'pk': instance.pk,
-            'order': getattr(instance, rank_field)
-        } for instance in chain(move_objs, [obj])]
+        return [
+            {'pk': instance.pk, 'order': getattr(instance, rank_field)}
+            for instance in chain(move_objs, [obj])
+        ]
 
     @staticmethod
     def get_extra_model_filters(request):
@@ -372,9 +360,7 @@ class SortableAdminMixin(SortableAdminBase):
         return {}
 
     def get_max_order(self, request, obj=None):
-        return self.model.objects.aggregate(
-            max_order=Coalesce(Max(self.default_order_field), 0)
-        )['max_order']
+        return self.model.objects.aggregate(max_order=Coalesce(Max(self.default_order_field), 0))['max_order']
 
     def _bulk_move(self, request, queryset, method):
         if not self.enable_sorting:
@@ -416,15 +402,9 @@ class SortableAdminMixin(SortableAdminBase):
             self.message_user(request, msg, level=messages.ERROR)
             return
 
-        endorders_start = getattr(
-            objects[page.start_index() - 1], self.default_order_field
-        )
+        endorders_start = getattr(objects[page.start_index() - 1], self.default_order_field)
         endorders_step = -1 if self.order_by.startswith('-') else 1
-        endorders = range(
-            endorders_start,
-            endorders_start + endorders_step * queryset_size,
-            endorders_step
-        )
+        endorders = range(endorders_start, endorders_start + endorders_step * queryset_size, endorders_step)
 
         if page.number > current_page_number:  # Move forward (like drag down)
             queryset = queryset.reverse()
@@ -455,10 +435,11 @@ class PolymorphicSortableAdminMixin(SortableAdminMixin):
     rather than ``admin.ModelAdmin``, then additionally inherit from ``PolymorphicSortableAdminMixin``
     rather than ``SortableAdminMixin``.
     """
+
     def get_max_order(self, request, obj=None):
-        return self.base_model.objects.aggregate(
-            max_order=Coalesce(Max(self.default_order_field), 0)
-        )['max_order']
+        return self.base_model.objects.aggregate(max_order=Coalesce(Max(self.default_order_field), 0))[
+            'max_order'
+        ]
 
 
 class CustomInlineFormSetMixin:
@@ -466,8 +447,9 @@ class CustomInlineFormSetMixin:
         self.default_order_direction, self.default_order_field = _get_default_ordering(self.model, self)
 
         if self.default_order_field not in self.form.base_fields:
-            self.form.base_fields[self.default_order_field] = \
-                self.model._meta.get_field(self.default_order_field).formfield()
+            self.form.base_fields[self.default_order_field] = self.model._meta.get_field(
+                self.default_order_field
+            ).formfield()
 
         self.form.base_fields[self.default_order_field].is_hidden = True
         self.form.base_fields[self.default_order_field].required = False
@@ -476,12 +458,8 @@ class CustomInlineFormSetMixin:
         super().__init__(*args, **kwargs)
 
     def get_max_order(self):
-        query_set = self.model.objects.filter(
-            **{self.fk.get_attname(): self.instance.pk}
-        )
-        return query_set.aggregate(
-            max_order=Coalesce(Max(self.default_order_field), 0)
-        )['max_order']
+        query_set = self.model.objects.filter(**{self.fk.get_attname(): self.instance.pk})
+        return query_set.aggregate(max_order=Coalesce(Max(self.default_order_field), 0))['max_order']
 
     def save_new(self, form, commit=True):
         """
@@ -548,19 +526,18 @@ class SortableInlineAdminMixin(SortableAdminBase):
 
     @property
     def media(self):
-        shared = (
-            super().media + widgets.Media(
-                js=('adminsortable2/js/libs/jquery.ui.sortable-1.11.4.js',
-                    'adminsortable2/js/inline-sortable.js')))
+        shared = super().media + widgets.Media(
+            js=('adminsortable2/js/libs/jquery.ui.sortable-1.11.4.js', 'adminsortable2/js/inline-sortable.js')
+        )
         if isinstance(self, admin.StackedInline):
             return shared + widgets.Media(
-                js=('adminsortable2/js/inline-sortable.js',
-                    'adminsortable2/js/inline-stacked.js'))
+                js=('adminsortable2/js/inline-sortable.js', 'adminsortable2/js/inline-stacked.js')
+            )
         else:
             # assume TabularInline (don't return None in any case)
             return shared + widgets.Media(
-                js=('adminsortable2/js/inline-sortable.js',
-                    'adminsortable2/js/inline-tabular.js'))
+                js=('adminsortable2/js/inline-sortable.js', 'adminsortable2/js/inline-tabular.js')
+            )
 
     @property
     def template(self):
@@ -580,14 +557,11 @@ class CustomGenericInlineFormSet(CustomInlineFormSetMixin, BaseGenericInlineForm
             **{
                 self.ct_fk_field.name: self.instance.pk,
                 self.ct_field.name: ContentType.objects.get_for_model(
-                    self.instance,
-                    for_concrete_model=self.for_concrete_model
-                )
+                    self.instance, for_concrete_model=self.for_concrete_model
+                ),
             }
         )
-        return query_set.aggregate(
-            max_order=Coalesce(Max(self.default_order_field), 0)
-        )['max_order']
+        return query_set.aggregate(max_order=Coalesce(Max(self.default_order_field), 0))['max_order']
 
 
 class SortableGenericInlineAdminMixin(SortableInlineAdminMixin):
diff --git a/gestion.wsgi b/gestion.wsgi
index 96e9b75..5be6b5b 100644
--- a/gestion.wsgi
+++ b/gestion.wsgi
@@ -4,4 +4,5 @@ import sys
 sys.path.append(os.path.dirname(__file__))
 os.environ['DJANGO_SETTINGS_MODULE'] = 'eo_gestion.settings'
 import django.core.handlers.wsgi
+
 application = django.core.handlers.wsgi.WSGIHandler()
diff --git a/setup.py b/setup.py
index 38d2574..2e883f8 100644
--- a/setup.py
+++ b/setup.py
@@ -3,11 +3,11 @@
 
 import os
 import subprocess
-
 from distutils.cmd import Command
 from distutils.command.build import build as _build
 from distutils.command.sdist import sdist
-from setuptools import setup, find_packages
+
+from setuptools import find_packages, setup
 from setuptools.command.install_lib import install_lib as _install_lib
 
 install_requires = [
@@ -23,11 +23,11 @@ install_requires = [
 
 
 def get_version():
-    '''Use the VERSION, if absent generates a version with git describe, if not
-       tag exists, take 0.0- and add the length of the commit log.
-    '''
+    """Use the VERSION, if absent generates a version with git describe, if not
+    tag exists, take 0.0- and add the length of the commit log.
+    """
     if os.path.exists('VERSION'):
-        with open('VERSION', 'r') as v:
+        with open('VERSION') as v:
             return v.read()
     if os.path.exists('.git'):
         p = subprocess.Popen(
diff --git a/tests/base/conftest.py b/tests/base/conftest.py
index cf68317..3b5d0ee 100644
--- a/tests/base/conftest.py
+++ b/tests/base/conftest.py
@@ -15,11 +15,8 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import pytest
-
-from django.core.management import call_command
-
 from django.contrib.auth.models import User
-
+from django.core.management import call_command
 
 DATA = ["tests/fixture.json"]
 
diff --git a/tests/base/test_api.py b/tests/base/test_api.py
index 34d9cd8..4f2d57c 100644
--- a/tests/base/test_api.py
+++ b/tests/base/test_api.py
@@ -14,9 +14,10 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from eo_gestion.eo_facture.models import Contrat
 from taggit.models import Tag
 
+from eo_gestion.eo_facture.models import Contrat
+
 
 def test_references(app):
     gru = Tag.objects.create(name='GRU')
diff --git a/tests/conftest.py b/tests/conftest.py
index 17f4bea..942c417 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -14,9 +14,8 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import pytest
-
 import django_webtest
+import pytest
 
 
 @pytest.fixture
diff --git a/tests/settings.py b/tests/settings.py
index e169ac8..6bb635b 100644
--- a/tests/settings.py
+++ b/tests/settings.py
@@ -16,7 +16,6 @@
 
 import os
 
-
 ALLOWED_HOSTS = ["localhost"]
 
 DATABASES = {
diff --git a/tests/test_chorus.py b/tests/test_chorus.py
index 1ec0323..75e060b 100644
--- a/tests/test_chorus.py
+++ b/tests/test_chorus.py
@@ -14,9 +14,8 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import pytest
 import httmock
-
+import pytest
 import requests
 
 from eo_gestion.chorus import chorus
@@ -47,7 +46,12 @@ def chorus_connection_error(url, request):
 @httmock.urlmatch()
 def chorus_error_500(url, request):
     return httmock.response(
-        500, b'Pas content \xe9', headers={'Header Pourri': 'Héhé'.encode('latin1'), 'Header-Ok': 'ok',}
+        500,
+        b'Pas content \xe9',
+        headers={
+            'Header Pourri': 'Héhé'.encode('latin1'),
+            'Header-Ok': 'ok',
+        },
     )
 
 
@@ -69,5 +73,8 @@ def test_push_to_chorus_error_500():
     assert result == {
         'http.response.status-code': 500,
         'http.response.body': "b'Pas content \\xe9'",
-        'http.response.headers': {'Header Pourri': 'H�h�', 'Header-Ok': 'ok',},
+        'http.response.headers': {
+            'Header Pourri': 'H�h�',
+            'Header-Ok': 'ok',
+        },
     }
diff --git a/tests/test_facturx.py b/tests/test_facturx.py
index 8ec5227..d3e0c29 100644
--- a/tests/test_facturx.py
+++ b/tests/test_facturx.py
@@ -16,12 +16,12 @@
 
 import datetime
 import io
-import pytest
 import xml.etree.ElementTree as ET
 
 import facturx
+import pytest
 
-from eo_gestion.eo_facture.facturx import to_pdfa, add_facturx_from_bytes
+from eo_gestion.eo_facture.facturx import add_facturx_from_bytes, to_pdfa
 
 
 @pytest.fixture
@@ -88,7 +88,14 @@ def test_add_facturx_from_bytes(fake_invoice_bytes):
                     ['PostalTradeAddress', ['CountryID', 'FR']],
                     ['SpecifiedTaxRegistration', ['ID', 'FR09491081899']],
                 ],
-                ['BuyerTradeParty', ['Name', 'RGFIPD'], ['SpecifiedLegalOrganization', ['ID', '1234'],],],
+                [
+                    'BuyerTradeParty',
+                    ['Name', 'RGFIPD'],
+                    [
+                        'SpecifiedLegalOrganization',
+                        ['ID', '1234'],
+                    ],
+                ],
                 ['BuyerOrderReferencedDocument', ['IssuerAssignedID', '5678']],
                 ['ContractReferencedDocument', ['IssuerAssignedID', 'ABCD']],
             ],
diff --git a/tests/test_forms.py b/tests/test_forms.py
index fad5221..eef0ca7 100644
--- a/tests/test_forms.py
+++ b/tests/test_forms.py
@@ -17,6 +17,7 @@
 from datetime import date, timedelta
 
 from django.contrib.auth.models import User
+
 from eo_gestion.eo_facture.forms import FactureForm
 from eo_gestion.eo_facture.models import Client, Contrat
 
@@ -86,4 +87,4 @@ def test_facture_form(db, freezer):
     data['initial-emission'] = '2019-01-03'
     form = FactureForm(data=dict(data, proforma='true', emission='2019-01-01'), instance=facture)
     assert not form.is_valid(), form.errors
-    assert set(form.errors) == set(['proforma', 'emission'])
+    assert set(form.errors) == {'proforma', 'emission'}
diff --git a/tox.ini b/tox.ini
index efd2db5..c35de06 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 toxworkdir = {env:TMPDIR:/tmp}/tox-{env:USER}/barbacompta/{env:BRANCH_NAME:}
-envlist = py3-pylint
+envlist = py3-pylint,code-style
 
 [testenv]
 setenv =
@@ -29,6 +29,13 @@ setenv =
 commands =
   ./manage.py {posargs:--help}
 
+[testenv:code-style]
+skip_install = true
+deps =
+  pre-commit
+commands =
+  pre-commit run --all-files --show-diff-on-failure
+
 [pytest]
 filterwarnings=
   ignore:Using or importing the ABCs from