diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3d786881a..6901171fb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,6 +9,7 @@ tests:
         - cd src
         - pip3 install -q -r requirements.txt
         - flake8 --ignore=E123,F403,F401,N802,C901,W503 .
+        - isort -c -rc .
         - python3 manage.py check
         - make
         - make compress
diff --git a/.travis.yml b/.travis.yml
index 493155872..91526ca22 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ install:
 before_script:
     - cd src
     - flake8 --ignore=E123,F403,F401,N802,C901,W503 .
+    - isort -c -rc .
     - python manage.py check
 script:
     - make
diff --git a/doc/development/setup.rst b/doc/development/setup.rst
index 55c8e3a55..d3e9c0c9c 100644
--- a/doc/development/setup.rst
+++ b/doc/development/setup.rst
@@ -77,6 +77,7 @@ Code checks and unit tests
 Before you check in your code into git, always run the static checkers and unit tests::
 
     flake8 .
+    isort -c -rc .
     python manage.py validate
     py.test
 
diff --git a/doc/development/style.rst b/doc/development/style.rst
index 4d5060a1a..67d093724 100644
--- a/doc/development/style.rst
+++ b/doc/development/style.rst
@@ -22,6 +22,8 @@ Python code
  So please make sure that you *always* follow all other rules and break these rules *only when
  it makes sense*.
 
+* Use ``isort -rc pretix`` in the source directory to order your imports.
+
 * Indent your code with four spaces.
 
 * For templates and models, follow the `Django Coding Style`_.
diff --git a/src/pretix/base/cache.py b/src/pretix/base/cache.py
index e896d8b1c..52cdbb36a 100644
--- a/src/pretix/base/cache.py
+++ b/src/pretix/base/cache.py
@@ -1,5 +1,5 @@
-import time
 import hashlib
+import time
 
 from django.core.cache import caches
 
diff --git a/src/pretix/base/forms/__init__.py b/src/pretix/base/forms/__init__.py
index b9e42cc64..7ef7e8d9a 100644
--- a/src/pretix/base/forms/__init__.py
+++ b/src/pretix/base/forms/__init__.py
@@ -1,11 +1,13 @@
 import copy
-from django.db import models
-from django.forms.models import ModelFormMetaclass, BaseModelForm
+
 from django import forms
+from django.db import models
+from django.forms.models import BaseModelForm, ModelFormMetaclass
 from django.utils import six
-from pretix.base.i18n import I18nFormField
-from versions.models import Versionable
 from django.utils.translation import ugettext_lazy as _
+from versions.models import Versionable
+
+from pretix.base.i18n import I18nFormField
 
 
 class BaseI18nModelForm(BaseModelForm):
diff --git a/src/pretix/base/forms/user.py b/src/pretix/base/forms/user.py
index 5eba17b7b..a97dd51e4 100644
--- a/src/pretix/base/forms/user.py
+++ b/src/pretix/base/forms/user.py
@@ -2,7 +2,6 @@ from django import forms
 from django.contrib.auth.hashers import check_password
 from django.db.models import Q
 from django.utils.translation import ugettext_lazy as _
-# from pytz import common_timezones
 
 from pretix.base.models import User
 
diff --git a/src/pretix/base/i18n.py b/src/pretix/base/i18n.py
index f5c56ce23..025aa0eb1 100644
--- a/src/pretix/base/i18n.py
+++ b/src/pretix/base/i18n.py
@@ -1,8 +1,9 @@
 import copy
 import json
-from django.conf import settings
-from django.db.models import TextField, SubfieldBase
+
 from django import forms
+from django.conf import settings
+from django.db.models import SubfieldBase, TextField
 from django.utils import translation
 from django.utils.safestring import mark_safe
 
diff --git a/src/pretix/base/middleware.py b/src/pretix/base/middleware.py
index c236fdef4..2f17135dc 100644
--- a/src/pretix/base/middleware.py
+++ b/src/pretix/base/middleware.py
@@ -1,19 +1,16 @@
-from django.core.urlresolvers import get_script_prefix
-import pytz
-
-from django.conf import settings
-from django.middleware.locale import LocaleMiddleware as BaseLocaleMiddleware
-from django.utils.translation.trans_real import (
-    get_supported_language_variant,
-    parse_accept_lang_header,
-    language_code_re,
-    check_for_language
-)
-from django.utils.translation import LANGUAGE_SESSION_KEY
-from django.utils import translation, timezone
 from collections import OrderedDict
-from django.utils.cache import patch_vary_headers
 
+import pytz
+from django.conf import settings
+from django.core.urlresolvers import get_script_prefix
+from django.middleware.locale import LocaleMiddleware as BaseLocaleMiddleware
+from django.utils import timezone, translation
+from django.utils.cache import patch_vary_headers
+from django.utils.translation import LANGUAGE_SESSION_KEY
+from django.utils.translation.trans_real import (
+    check_for_language, get_supported_language_variant, language_code_re,
+    parse_accept_lang_header,
+)
 
 _supported = None
 
diff --git a/src/pretix/base/migrations/0001_initial.py b/src/pretix/base/migrations/0001_initial.py
index 8eeeb7e3a..198e94e2f 100644
--- a/src/pretix/base/migrations/0001_initial.py
+++ b/src/pretix/base/migrations/0001_initial.py
@@ -1,14 +1,15 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
-from django.contrib.auth.hashers import make_password
 
-from django.db import models, migrations
-import pretix.base.models
-import django.db.models.deletion
-import pretix.base.i18n
-import versions.models
 import django.core.validators
+import django.db.models.deletion
+import versions.models
 from django.conf import settings
+from django.contrib.auth.hashers import make_password
+from django.db import migrations, models
+
+import pretix.base.i18n
+import pretix.base.models
 
 
 def initial_user(apps, schema_editor):
diff --git a/src/pretix/base/migrations/0002_auto_20150524_1148.py b/src/pretix/base/migrations/0002_auto_20150524_1148.py
index 1654d8cec..fdf6989df 100644
--- a/src/pretix/base/migrations/0002_auto_20150524_1148.py
+++ b/src/pretix/base/migrations/0002_auto_20150524_1148.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
diff --git a/src/pretix/base/migrations/0003_auto_20150602_2232.py b/src/pretix/base/migrations/0003_auto_20150602_2232.py
index 8a055357c..ef04f2357 100644
--- a/src/pretix/base/migrations/0003_auto_20150602_2232.py
+++ b/src/pretix/base/migrations/0003_auto_20150602_2232.py
@@ -1,8 +1,8 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
 import django.core.validators
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
diff --git a/src/pretix/base/migrations/0004_eventpermission_can_change_permissions.py b/src/pretix/base/migrations/0004_eventpermission_can_change_permissions.py
index fbfec7b01..40697eb93 100644
--- a/src/pretix/base/migrations/0004_eventpermission_can_change_permissions.py
+++ b/src/pretix/base/migrations/0004_eventpermission_can_change_permissions.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):
diff --git a/src/pretix/base/models.py b/src/pretix/base/models.py
index 1e4196e96..0d435792a 100644
--- a/src/pretix/base/models.py
+++ b/src/pretix/base/models.py
@@ -1,24 +1,30 @@
-from datetime import datetime, timedelta
-from itertools import product
 import copy
-import uuid
 import random
 import time
+import uuid
+from datetime import datetime, timedelta
+from itertools import product
 
-from django.db import models
+import six
 from django.conf import settings
-from django.contrib.auth.models import AbstractBaseUser, BaseUserManager, PermissionsMixin
+from django.contrib.auth.models import (
+    AbstractBaseUser, BaseUserManager, PermissionsMixin,
+)
+from django.core.validators import RegexValidator
+from django.db import models
 from django.db.models import Q, Count
+from django.template.defaultfilters import date as _date
 from django.utils.functional import cached_property
 from django.utils.timezone import now
 from django.utils.translation import ugettext_lazy as _
-from django.template.defaultfilters import date as _date
-from django.core.validators import RegexValidator
+from versions.models import (
+    Versionable as BaseVersionable, VersionedForeignKey,
+    VersionedManyToManyField, get_utc_now,
+)
+
 from pretix.base.i18n import I18nCharField, I18nTextField
 from pretix.base.settings import SettingsProxy
-import six
-from versions.models import Versionable as BaseVersionable
-from versions.models import VersionedForeignKey, VersionedManyToManyField, get_utc_now
+
 from .types import VariationDict
 
 
diff --git a/src/pretix/base/payment.py b/src/pretix/base/payment.py
index e081e4c47..df6383d52 100644
--- a/src/pretix/base/payment.py
+++ b/src/pretix/base/payment.py
@@ -1,17 +1,17 @@
 from collections import OrderedDict
 from decimal import Decimal
+
 from django import forms
 from django.contrib import messages
-from django.db.models import Sum, Q
+from django.db.models import Q, Sum
 from django.dispatch import receiver
-
 from django.forms import Form
 from django.http import HttpRequest
 from django.template.loader import get_template
 from django.utils.translation import ugettext_lazy as _
-from pretix.base.models import Order, CartPosition
-from pretix.base.services.orders import mark_order_paid
 
+from pretix.base.models import CartPosition, Order
+from pretix.base.services.orders import mark_order_paid
 from pretix.base.settings import SettingsSandbox
 from pretix.base.signals import register_payment_providers
 
diff --git a/src/pretix/base/services/locking.py b/src/pretix/base/services/locking.py
index 16c9b810c..b860ae3a7 100644
--- a/src/pretix/base/services/locking.py
+++ b/src/pretix/base/services/locking.py
@@ -1,9 +1,10 @@
-from datetime import timedelta
 import logging
 import time
+from datetime import timedelta
+
+from django.conf import settings
 from django.db.models import Q
 from django.utils.timezone import now
-from pretix import settings
 
 from pretix.base.models import Quota
 
diff --git a/src/pretix/base/services/mail.py b/src/pretix/base/services/mail.py
index ddf7cd4be..7b8457cdf 100644
--- a/src/pretix/base/services/mail.py
+++ b/src/pretix/base/services/mail.py
@@ -1,4 +1,5 @@
 import logging
+
 from django.conf import settings
 from django.core.mail import EmailMessage
 from django.core.urlresolvers import reverse
@@ -7,7 +8,7 @@ from django.utils import translation
 from django.utils.translation import ugettext as _
 
 from pretix.base.i18n import LazyI18nString
-from pretix.base.models import User, Event
+from pretix.base.models import Event, User
 from pretix.helpers.urls import build_absolute_uri
 
 logger = logging.getLogger('pretix.base.mail')
diff --git a/src/pretix/base/services/orders.py b/src/pretix/base/services/orders.py
index d64d63499..6eac15a96 100644
--- a/src/pretix/base/services/orders.py
+++ b/src/pretix/base/services/orders.py
@@ -1,8 +1,10 @@
-from datetime import timedelta, datetime
+from datetime import datetime, timedelta
+
 from django.db import transaction
 from django.utils.timezone import now
-from pretix.base.models import Order, Quota, OrderPosition
 from django.utils.translation import ugettext_lazy as _
+
+from pretix.base.models import Order, OrderPosition, Quota
 from pretix.base.services.mail import mail
 from pretix.helpers.urls import build_absolute_uri
 
diff --git a/src/pretix/base/settings.py b/src/pretix/base/settings.py
index 7540b5a11..cb390bee9 100644
--- a/src/pretix/base/settings.py
+++ b/src/pretix/base/settings.py
@@ -1,13 +1,12 @@
-from datetime import datetime, date, time
-import json
 import decimal
+import json
+from datetime import date, datetime, time
 
 import dateutil.parser
-from django.db.models import Model
 from django.conf import settings
+from django.db.models import Model
 from versions.models import Versionable
 
-
 DEFAULTS = {
     'user_mail_required': {
         'default': 'False',
diff --git a/src/pretix/base/ticketoutput.py b/src/pretix/base/ticketoutput.py
index d6ea50566..680bd8cd5 100644
--- a/src/pretix/base/ticketoutput.py
+++ b/src/pretix/base/ticketoutput.py
@@ -1,10 +1,10 @@
 from collections import OrderedDict
-from django import forms
 
+from django import forms
 from django.http import HttpRequest, HttpResponse
 from django.utils.translation import ugettext_lazy as _
-from pretix.base.models import Order
 
+from pretix.base.models import Order
 from pretix.base.settings import SettingsSandbox
 
 
diff --git a/src/pretix/control/context.py b/src/pretix/control/context.py
index aa3cbeb1d..2edbe53bf 100644
--- a/src/pretix/control/context.py
+++ b/src/pretix/control/context.py
@@ -1,5 +1,6 @@
 from django.conf import settings
-from django.core.urlresolvers import resolve, get_script_prefix
+from django.core.urlresolvers import get_script_prefix, resolve
+
 from .signals import html_head, nav_event
 
 
diff --git a/src/pretix/control/forms/__init__.py b/src/pretix/control/forms/__init__.py
index bc452df98..042d57268 100644
--- a/src/pretix/control/forms/__init__.py
+++ b/src/pretix/control/forms/__init__.py
@@ -1,5 +1,6 @@
 from functools import partial
 from itertools import product
+
 from django import forms
 from django.core.exceptions import ValidationError
 from django.db import transaction
@@ -9,9 +10,9 @@ from django.utils.encoding import force_text
 from django.utils.html import format_html
 from django.utils.safestring import mark_safe
 from django.utils.translation import ugettext_lazy as _
-from pretix.base.forms import VersionedModelForm
 
-from pretix.base.models import ItemVariation, Item
+from pretix.base.forms import VersionedModelForm
+from pretix.base.models import Item, ItemVariation
 
 
 class I18nInlineFormSet(BaseInlineFormSet):
diff --git a/src/pretix/control/forms/auth.py b/src/pretix/control/forms/auth.py
index 0b397c1e0..ac224e0d3 100644
--- a/src/pretix/control/forms/auth.py
+++ b/src/pretix/control/forms/auth.py
@@ -1,7 +1,9 @@
-from django.contrib.auth.forms import AuthenticationForm as BaseAuthenticationForm
 from django import forms
-from django.utils.translation import ugettext as _
 from django.contrib.auth import authenticate
+from django.contrib.auth.forms import \
+    AuthenticationForm as BaseAuthenticationForm
+from django.utils.translation import ugettext as _
+
 from pretix.base.models import User
 
 
diff --git a/src/pretix/control/forms/event.py b/src/pretix/control/forms/event.py
index e7a581d43..5284a444a 100644
--- a/src/pretix/control/forms/event.py
+++ b/src/pretix/control/forms/event.py
@@ -1,10 +1,9 @@
-from django.conf import settings
 from django import forms
+from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
-
 from pytz import common_timezones
 
-from pretix.base.forms import VersionedModelForm, SettingsForm
+from pretix.base.forms import SettingsForm, VersionedModelForm
 from pretix.base.models import Event
 
 
diff --git a/src/pretix/control/forms/item.py b/src/pretix/control/forms/item.py
index 09719abf8..900372bed 100644
--- a/src/pretix/control/forms/item.py
+++ b/src/pretix/control/forms/item.py
@@ -1,11 +1,14 @@
 import copy
+
 from django.db import models
 from django.forms import BooleanField
 from django.utils.translation import ugettext_lazy as _
-from pretix.base.forms import VersionedModelForm, I18nModelForm
+
+from pretix.base.forms import I18nModelForm, VersionedModelForm
 from pretix.base.models import (
-    Item, ItemCategory, Property, ItemVariation, PropertyValue, Question, Quota,
-    Versionable)
+    Item, ItemCategory, ItemVariation, Property, PropertyValue, Question,
+    Quota, Versionable,
+)
 from pretix.control.forms import TolerantFormsetModelForm, VariationsField
 
 
diff --git a/src/pretix/control/forms/orders.py b/src/pretix/control/forms/orders.py
index 4dfbd06d7..f8f2e23ae 100644
--- a/src/pretix/control/forms/orders.py
+++ b/src/pretix/control/forms/orders.py
@@ -1,5 +1,4 @@
 from pretix.base.forms import VersionedModelForm
-
 from pretix.base.models import Order
 
 
diff --git a/src/pretix/control/forms/organizer.py b/src/pretix/control/forms/organizer.py
index 45c5633d8..b35742c7a 100644
--- a/src/pretix/control/forms/organizer.py
+++ b/src/pretix/control/forms/organizer.py
@@ -1,7 +1,7 @@
 from django import forms
 from django.utils.translation import ugettext_lazy as _
-from pretix.base.forms import VersionedModelForm
 
+from pretix.base.forms import VersionedModelForm
 from pretix.base.models import Organizer
 
 
diff --git a/src/pretix/control/middleware.py b/src/pretix/control/middleware.py
index 089377519..47855a9f4 100644
--- a/src/pretix/control/middleware.py
+++ b/src/pretix/control/middleware.py
@@ -1,13 +1,14 @@
 from urllib.parse import urlparse
+
 from django.conf import settings
-from django.core.urlresolvers import resolve, get_script_prefix
-from django.utils.encoding import force_str
-from django.shortcuts import resolve_url
 from django.contrib.auth import REDIRECT_FIELD_NAME
+from django.core.urlresolvers import get_script_prefix, resolve
 from django.http import HttpResponseNotFound
+from django.shortcuts import resolve_url
+from django.utils.encoding import force_str
 from django.utils.translation import ugettext as _
 
-from pretix.base.models import Event, Organizer, EventPermission
+from pretix.base.models import Event, EventPermission, Organizer
 
 
 class PermissionMiddleware:
diff --git a/src/pretix/control/signals.py b/src/pretix/control/signals.py
index 67e211a30..a322ac24f 100644
--- a/src/pretix/control/signals.py
+++ b/src/pretix/control/signals.py
@@ -1,6 +1,5 @@
 from pretix.base.signals import EventPluginSignal
 
-
 """
 This signal is sent out to build configuration forms for all restriction formsets
 (see plugin API documentation for details).
diff --git a/src/pretix/control/templatetags/order_overview.py b/src/pretix/control/templatetags/order_overview.py
index e3fb24f16..93c7c8333 100644
--- a/src/pretix/control/templatetags/order_overview.py
+++ b/src/pretix/control/templatetags/order_overview.py
@@ -1,8 +1,7 @@
 from django import template
+from django.utils import formats
 from django.utils.html import conditional_escape
 from django.utils.safestring import mark_safe
-from django.utils import formats
-
 
 register = template.Library()
 
diff --git a/src/pretix/control/urls.py b/src/pretix/control/urls.py
index c80f2ada1..6ac6ea7c8 100644
--- a/src/pretix/control/urls.py
+++ b/src/pretix/control/urls.py
@@ -1,7 +1,8 @@
-from django.conf.urls import url, include
+from django.conf.urls import include, url
 
-
-from pretix.control.views import main, event, item, auth, orders, user, organizer
+from pretix.control.views import (
+    auth, event, item, main, orders, organizer, user,
+)
 
 urlpatterns = [
     url(r'^logout$', auth.logout, name='auth.logout'),
diff --git a/src/pretix/control/views/auth.py b/src/pretix/control/views/auth.py
index 9e3a763fe..3fe1c476d 100644
--- a/src/pretix/control/views/auth.py
+++ b/src/pretix/control/views/auth.py
@@ -1,9 +1,13 @@
 from django.conf import settings
-from django.shortcuts import render, redirect
-from django.contrib.auth import login as auth_login, authenticate
-from django.contrib.auth import logout as auth_logout
+from django.contrib.auth import (
+    authenticate, login as auth_login, logout as auth_logout,
+)
+from django.shortcuts import redirect, render
+
 from pretix.base.models import User
-from pretix.control.forms.auth import AuthenticationForm, GlobalRegistrationForm
+from pretix.control.forms.auth import (
+    AuthenticationForm, GlobalRegistrationForm,
+)
 
 
 def login(request):
diff --git a/src/pretix/control/views/event.py b/src/pretix/control/views/event.py
index be463e614..78f6bac65 100644
--- a/src/pretix/control/views/event.py
+++ b/src/pretix/control/views/event.py
@@ -1,21 +1,29 @@
 from collections import OrderedDict
-from django import forms
 
+from django import forms
 from django.contrib import messages
+from django.core.urlresolvers import reverse
 from django.db.models import Sum
 from django.forms import modelformset_factory
-from django.shortcuts import render, redirect
+from django.shortcuts import redirect, render
 from django.utils.functional import cached_property
+from django.utils.translation import ugettext_lazy as _
 from django.views.generic import FormView
 from django.views.generic.base import TemplateView
 from django.views.generic.detail import SingleObjectMixin
-from django.utils.translation import ugettext_lazy as _
-from django.core.urlresolvers import reverse
+
 from pretix.base.forms import VersionedModelForm
-from pretix.control.forms.event import ProviderForm, TicketSettingsForm, EventSettingsForm, EventUpdateForm
-from pretix.base.models import Event, OrderPosition, Order, Item, EventPermission, User
-from pretix.base.signals import register_payment_providers, register_ticket_outputs
+from pretix.base.models import (
+    Event, EventPermission, Item, Order, OrderPosition, User,
+)
+from pretix.base.signals import (
+    register_payment_providers, register_ticket_outputs,
+)
+from pretix.control.forms.event import (
+    EventSettingsForm, EventUpdateForm, ProviderForm, TicketSettingsForm,
+)
 from pretix.control.permissions import EventPermissionRequiredMixin
+
 from . import UpdateView
 
 
diff --git a/src/pretix/control/views/item.py b/src/pretix/control/views/item.py
index 9d644c2a6..7b74d63a5 100644
--- a/src/pretix/control/views/item.py
+++ b/src/pretix/control/views/item.py
@@ -1,26 +1,33 @@
 from itertools import product
 
 from django.contrib import messages
+from django.core.urlresolvers import resolve, reverse
 from django.db import transaction
+from django.forms.models import inlineformset_factory
+from django.http import Http404, HttpResponseForbidden, HttpResponseRedirect
+from django.shortcuts import redirect
 from django.utils.functional import cached_property
+from django.utils.translation import ugettext_lazy as _
 from django.views.generic import ListView
-from django.views.generic.edit import DeleteView
 from django.views.generic.base import TemplateView
 from django.views.generic.detail import SingleObjectMixin
-from django.core.urlresolvers import resolve, reverse
-from django.http import HttpResponseRedirect, HttpResponseForbidden, Http404
-from django.shortcuts import redirect
-from django.forms.models import inlineformset_factory
-from django.utils.translation import ugettext_lazy as _
+from django.views.generic.edit import DeleteView
+
 from pretix.base.models import (
-    Item, ItemCategory, Property, ItemVariation, PropertyValue, Question, Quota)
-from pretix.control.forms.item import ItemVariationForm, QuotaForm, QuestionForm, PropertyForm, PropertyValueForm, \
-    CategoryForm
-from pretix.control.forms.item import ItemFormGeneral
-from pretix.control.permissions import EventPermissionRequiredMixin, event_permission_required
-from pretix.control.forms import VariationsField, I18nInlineFormSet
+    Item, ItemCategory, ItemVariation, Property, PropertyValue, Question,
+    Quota,
+)
+from pretix.control.forms import I18nInlineFormSet, VariationsField
+from pretix.control.forms.item import (
+    CategoryForm, ItemFormGeneral, ItemVariationForm, PropertyForm,
+    PropertyValueForm, QuestionForm, QuotaForm,
+)
+from pretix.control.permissions import (
+    EventPermissionRequiredMixin, event_permission_required,
+)
 from pretix.control.signals import restriction_formset
-from . import UpdateView, CreateView
+
+from . import CreateView, UpdateView
 
 
 class ItemList(ListView):
diff --git a/src/pretix/control/views/main.py b/src/pretix/control/views/main.py
index 6e0d14a8e..d4daf698c 100644
--- a/src/pretix/control/views/main.py
+++ b/src/pretix/control/views/main.py
@@ -1,8 +1,8 @@
 from django.contrib import messages
 from django.core.urlresolvers import reverse
 from django.shortcuts import render
-from django.views.generic import ListView, CreateView, TemplateView
 from django.utils.translation import ugettext_lazy as _
+from django.views.generic import CreateView, ListView, TemplateView
 
 from pretix.base.models import Event, EventPermission, OrganizerPermission
 from pretix.control.forms.event import EventCreateForm
diff --git a/src/pretix/control/views/orders.py b/src/pretix/control/views/orders.py
index 9710edaa7..34a5c3db4 100644
--- a/src/pretix/control/views/orders.py
+++ b/src/pretix/control/views/orders.py
@@ -1,14 +1,15 @@
 from itertools import groupby
 
 from django.contrib import messages
-from django.db.models import Count, Q, Sum
-from django.utils.timezone import now
-from django.utils.translation import ugettext_lazy as _
+from django.db.models import Q, Count, Sum
 from django.http import HttpResponse
 from django.shortcuts import redirect, render
 from django.utils.functional import cached_property
-from django.views.generic import ListView, DetailView, TemplateView, View
-from pretix.base.models import Order, Quota, OrderPosition, ItemCategory, Item
+from django.utils.timezone import now
+from django.utils.translation import ugettext_lazy as _
+from django.views.generic import DetailView, ListView, TemplateView, View
+
+from pretix.base.models import Item, ItemCategory, Order, OrderPosition, Quota
 from pretix.base.services.orders import mark_order_paid
 from pretix.base.signals import register_payment_providers
 from pretix.control.forms.orders import ExtendForm
diff --git a/src/pretix/control/views/organizer.py b/src/pretix/control/views/organizer.py
index 53250be2c..099119c1c 100644
--- a/src/pretix/control/views/organizer.py
+++ b/src/pretix/control/views/organizer.py
@@ -2,10 +2,10 @@ from django.contrib import messages
 from django.core.urlresolvers import reverse
 from django.http import HttpResponseForbidden
 from django.utils.translation import ugettext_lazy as _
-from django.views.generic import ListView, UpdateView, CreateView
+from django.views.generic import CreateView, ListView, UpdateView
 
 from pretix.base.models import Organizer, OrganizerPermission
-from pretix.control.forms.organizer import OrganizerUpdateForm, OrganizerForm
+from pretix.control.forms.organizer import OrganizerForm, OrganizerUpdateForm
 from pretix.control.permissions import OrganizerPermissionRequiredMixin
 
 
diff --git a/src/pretix/control/views/user.py b/src/pretix/control/views/user.py
index dc84d653b..3ddd7ee68 100644
--- a/src/pretix/control/views/user.py
+++ b/src/pretix/control/views/user.py
@@ -1,10 +1,10 @@
 from django.contrib import messages
 from django.contrib.auth import update_session_auth_hash
 from django.core.urlresolvers import reverse
-from django.views.generic import UpdateView
 from django.utils.translation import ugettext_lazy as _
-from pretix.base.forms.user import UserSettingsForm
+from django.views.generic import UpdateView
 
+from pretix.base.forms.user import UserSettingsForm
 from pretix.base.models import User
 
 
diff --git a/src/pretix/helpers/logs.py b/src/pretix/helpers/logs.py
index 63485103f..c7f65ad00 100644
--- a/src/pretix/helpers/logs.py
+++ b/src/pretix/helpers/logs.py
@@ -1,4 +1,5 @@
 import logging
+
 from django.conf import settings
 
 
diff --git a/src/pretix/helpers/urls.py b/src/pretix/helpers/urls.py
index 21624ff77..dcc2b8092 100644
--- a/src/pretix/helpers/urls.py
+++ b/src/pretix/helpers/urls.py
@@ -1,4 +1,5 @@
 from urllib.parse import urljoin
+
 from django.conf import settings
 from django.core.urlresolvers import reverse
 
diff --git a/src/pretix/plugins/__init__.py b/src/pretix/plugins/__init__.py
index 3ad9513f4..b36383a61 100644
--- a/src/pretix/plugins/__init__.py
+++ b/src/pretix/plugins/__init__.py
@@ -1,2 +1,3 @@
 from pkgutil import extend_path
+
 __path__ = extend_path(__path__, __name__)
diff --git a/src/pretix/plugins/banktransfer/__init__.py b/src/pretix/plugins/banktransfer/__init__.py
index 26bf1eb61..b51364987 100644
--- a/src/pretix/plugins/banktransfer/__init__.py
+++ b/src/pretix/plugins/banktransfer/__init__.py
@@ -1,6 +1,7 @@
 from django.apps import AppConfig
 from django.utils.functional import cached_property
 from django.utils.translation import ugettext_lazy as _
+
 from pretix.base.plugins import PluginType
 
 
diff --git a/src/pretix/plugins/banktransfer/mt940.py b/src/pretix/plugins/banktransfer/mt940.py
index 498c9b178..b26e376c6 100644
--- a/src/pretix/plugins/banktransfer/mt940.py
+++ b/src/pretix/plugins/banktransfer/mt940.py
@@ -33,11 +33,10 @@ __version__ = '0.2'
 __all__ = ['MT940', 'rabo_description', 'abn_amro_description',
            'ing_description']
 
-from collections import namedtuple, defaultdict
-from decimal import Decimal
 import datetime
 import re
-
+from collections import defaultdict, namedtuple
+from decimal import Decimal
 
 SECTIONS = {
     'begin': [':940:'],
diff --git a/src/pretix/plugins/banktransfer/mt940import.py b/src/pretix/plugins/banktransfer/mt940import.py
index a6c1555d8..6981bd10b 100644
--- a/src/pretix/plugins/banktransfer/mt940import.py
+++ b/src/pretix/plugins/banktransfer/mt940import.py
@@ -1,5 +1,6 @@
-from collections import defaultdict
 import io
+from collections import defaultdict
+
 from . import mt940
 
 
diff --git a/src/pretix/plugins/banktransfer/payment.py b/src/pretix/plugins/banktransfer/payment.py
index f13cefe35..f29bd03bc 100644
--- a/src/pretix/plugins/banktransfer/payment.py
+++ b/src/pretix/plugins/banktransfer/payment.py
@@ -1,8 +1,9 @@
-from collections import OrderedDict
 import json
+from collections import OrderedDict
+
+from django import forms
 from django.template.loader import get_template
 from django.utils.translation import ugettext_lazy as _
-from django import forms
 
 from pretix.base.payment import BasePaymentProvider
 
diff --git a/src/pretix/plugins/banktransfer/signals.py b/src/pretix/plugins/banktransfer/signals.py
index 634bbcd4a..c213be5bc 100644
--- a/src/pretix/plugins/banktransfer/signals.py
+++ b/src/pretix/plugins/banktransfer/signals.py
@@ -1,11 +1,11 @@
-from django.core.urlresolvers import reverse, resolve
+from django.core.urlresolvers import resolve, reverse
 from django.dispatch import receiver
 from django.utils.translation import ugettext_lazy as _
 
 from pretix.base.signals import register_payment_providers
+from pretix.control.signals import nav_event
 
 from .payment import BankTransfer
-from pretix.control.signals import nav_event
 
 
 @receiver(register_payment_providers)
diff --git a/src/pretix/plugins/banktransfer/urls.py b/src/pretix/plugins/banktransfer/urls.py
index 1ae7520aa..5b8ecf971 100644
--- a/src/pretix/plugins/banktransfer/urls.py
+++ b/src/pretix/plugins/banktransfer/urls.py
@@ -2,7 +2,6 @@ from django.conf.urls import url
 
 from . import views
 
-
 urlpatterns = [
     url(r'^control/event/(?P<organizer>[^/]+)/(?P<event>[^/]+)/banktransfer/import/', views.ImportView.as_view(),
         name='import'),
diff --git a/src/pretix/plugins/banktransfer/views.py b/src/pretix/plugins/banktransfer/views.py
index 7990a8e3e..1a0d60441 100644
--- a/src/pretix/plugins/banktransfer/views.py
+++ b/src/pretix/plugins/banktransfer/views.py
@@ -1,19 +1,19 @@
 import csv
-from decimal import Decimal
 import json
 import logging
 import re
+from decimal import Decimal
 
 from django.contrib import messages
 from django.shortcuts import redirect, render
 from django.utils.timezone import now
+from django.utils.translation import ugettext_lazy as _
 from django.views.generic import TemplateView
+
 from pretix.base.models import Order, Quota
 from pretix.base.services.orders import mark_order_paid
 from pretix.control.permissions import EventPermissionRequiredMixin
 from pretix.plugins.banktransfer import csvimport, mt940import
-from django.utils.translation import ugettext_lazy as _
-
 
 logger = logging.getLogger('pretix.plugins.banktransfer')
 
diff --git a/src/pretix/plugins/paypal/__init__.py b/src/pretix/plugins/paypal/__init__.py
index a43460b41..f096a33d6 100644
--- a/src/pretix/plugins/paypal/__init__.py
+++ b/src/pretix/plugins/paypal/__init__.py
@@ -1,6 +1,7 @@
 from django.apps import AppConfig
 from django.utils.functional import cached_property
 from django.utils.translation import ugettext_lazy as _
+
 from pretix.base.plugins import PluginType
 
 
diff --git a/src/pretix/plugins/paypal/payment.py b/src/pretix/plugins/paypal/payment.py
index 52611806f..5f77f5ca9 100644
--- a/src/pretix/plugins/paypal/payment.py
+++ b/src/pretix/plugins/paypal/payment.py
@@ -1,18 +1,17 @@
-from collections import OrderedDict
 import json
 import logging
+from collections import OrderedDict
 
+import paypalrestsdk
+from django import forms
 from django.contrib import messages
 from django.template.loader import get_template
-from django.utils.translation import ugettext_lazy as _
-from django.utils.translation import ugettext as __
-from django import forms
-import paypalrestsdk
-from pretix.base.models import Quota
-from pretix.base.services.orders import mark_order_paid
-from pretix.base.payment import BasePaymentProvider
-from pretix.helpers.urls import build_absolute_uri
+from django.utils.translation import ugettext as __, ugettext_lazy as _
 
+from pretix.base.models import Quota
+from pretix.base.payment import BasePaymentProvider
+from pretix.base.services.orders import mark_order_paid
+from pretix.helpers.urls import build_absolute_uri
 
 logger = logging.getLogger('pretix.plugins.paypal')
 
diff --git a/src/pretix/plugins/paypal/urls.py b/src/pretix/plugins/paypal/urls.py
index fb6148b23..5ede8ffac 100644
--- a/src/pretix/plugins/paypal/urls.py
+++ b/src/pretix/plugins/paypal/urls.py
@@ -1,7 +1,6 @@
-from django.conf.urls import url, include
-
-from .views import success, abort, retry
+from django.conf.urls import include, url
 
+from .views import abort, retry, success
 
 urlpatterns = [
     url(r'^paypal/', include([
diff --git a/src/pretix/plugins/paypal/views.py b/src/pretix/plugins/paypal/views.py
index 80cf422a2..4165daeeb 100644
--- a/src/pretix/plugins/paypal/views.py
+++ b/src/pretix/plugins/paypal/views.py
@@ -1,15 +1,15 @@
 import logging
+
+import paypalrestsdk
 from django.contrib import messages
 from django.contrib.auth.decorators import login_required
 from django.shortcuts import redirect
-import paypalrestsdk
+from django.utils.translation import ugettext as __, ugettext_lazy as _
+
 from pretix.base.models import Event, Order
-from django.utils.translation import ugettext_lazy as _
-from django.utils.translation import ugettext as __
 from pretix.helpers.urls import build_absolute_uri
 from pretix.plugins.paypal.payment import Paypal
 
-
 logger = logging.getLogger('pretix.plugins.paypal')
 
 
diff --git a/src/pretix/plugins/sendmail/__init__.py b/src/pretix/plugins/sendmail/__init__.py
index 82128933e..c55b17481 100644
--- a/src/pretix/plugins/sendmail/__init__.py
+++ b/src/pretix/plugins/sendmail/__init__.py
@@ -1,5 +1,6 @@
 from django.apps import AppConfig
 from django.utils.translation import ugettext_lazy as _
+
 from pretix.base.plugins import PluginType
 
 
diff --git a/src/pretix/plugins/sendmail/forms.py b/src/pretix/plugins/sendmail/forms.py
index e98278cbb..89e575344 100644
--- a/src/pretix/plugins/sendmail/forms.py
+++ b/src/pretix/plugins/sendmail/forms.py
@@ -1,5 +1,6 @@
 from django import forms
 from django.utils.translation import ugettext_lazy as _
+
 from pretix.base.i18n import I18nFormField, I18nTextarea, I18nTextInput
 from pretix.base.models import Order
 
diff --git a/src/pretix/plugins/sendmail/signals.py b/src/pretix/plugins/sendmail/signals.py
index 9ba636ae5..28873457a 100644
--- a/src/pretix/plugins/sendmail/signals.py
+++ b/src/pretix/plugins/sendmail/signals.py
@@ -1,4 +1,4 @@
-from django.core.urlresolvers import reverse, resolve
+from django.core.urlresolvers import resolve, reverse
 from django.dispatch import receiver
 from django.utils.translation import ugettext_lazy as _
 
diff --git a/src/pretix/plugins/sendmail/urls.py b/src/pretix/plugins/sendmail/urls.py
index f04e05e82..710bb56ae 100644
--- a/src/pretix/plugins/sendmail/urls.py
+++ b/src/pretix/plugins/sendmail/urls.py
@@ -2,7 +2,6 @@ from django.conf.urls import url
 
 from . import views
 
-
 urlpatterns = [
     url(r'^control/event/(?P<organizer>[^/]+)/(?P<event>[^/]+)/sendmail/', views.SenderView.as_view(),
         name='send'),
diff --git a/src/pretix/plugins/sendmail/views.py b/src/pretix/plugins/sendmail/views.py
index 88e24f42c..03cc47317 100644
--- a/src/pretix/plugins/sendmail/views.py
+++ b/src/pretix/plugins/sendmail/views.py
@@ -1,4 +1,5 @@
 import logging
+
 from django.contrib import messages
 from django.shortcuts import redirect
 from django.utils.translation import ugettext_lazy as _
@@ -10,7 +11,6 @@ from pretix.control.permissions import EventPermissionRequiredMixin
 
 from . import forms
 
-
 logger = logging.getLogger('pretix.plugins.sendmail')
 
 
diff --git a/src/pretix/plugins/stripe/__init__.py b/src/pretix/plugins/stripe/__init__.py
index b1da15ffa..5f8ba1cc0 100644
--- a/src/pretix/plugins/stripe/__init__.py
+++ b/src/pretix/plugins/stripe/__init__.py
@@ -1,6 +1,7 @@
 from django.apps import AppConfig
 from django.utils.functional import cached_property
 from django.utils.translation import ugettext_lazy as _
+
 from pretix.base.plugins import PluginType
 
 
diff --git a/src/pretix/plugins/stripe/payment.py b/src/pretix/plugins/stripe/payment.py
index 695546ce5..50cdd66d0 100644
--- a/src/pretix/plugins/stripe/payment.py
+++ b/src/pretix/plugins/stripe/payment.py
@@ -1,17 +1,17 @@
-from collections import OrderedDict
 import json
 import logging
+from collections import OrderedDict
 
+import stripe
+from django import forms
 from django.contrib import messages
 from django.template.loader import get_template
 from django.utils.translation import ugettext_lazy as _
-from django import forms
+
 from pretix.base.models import Quota
+from pretix.base.payment import BasePaymentProvider
 from pretix.base.services.orders import mark_order_paid
 from pretix.helpers.urls import build_absolute_uri
-import stripe
-from pretix.base.payment import BasePaymentProvider
-
 
 logger = logging.getLogger('pretix.plugins.stripe')
 
diff --git a/src/pretix/plugins/stripe/signals.py b/src/pretix/plugins/stripe/signals.py
index eeb0d403f..e1fc470cf 100644
--- a/src/pretix/plugins/stripe/signals.py
+++ b/src/pretix/plugins/stripe/signals.py
@@ -4,7 +4,6 @@ from django.template import Context
 from django.template.loader import get_template
 
 from pretix.base.signals import register_payment_providers
-
 from pretix.presale.signals import html_head
 
 
diff --git a/src/pretix/plugins/stripe/urls.py b/src/pretix/plugins/stripe/urls.py
index 34110a67a..046d9e639 100644
--- a/src/pretix/plugins/stripe/urls.py
+++ b/src/pretix/plugins/stripe/urls.py
@@ -1,8 +1,7 @@
-from django.conf.urls import url, include
+from django.conf.urls import include, url
 
 from .views import webhook
 
-
 urlpatterns = [
     url(r'^stripe/', include([
         url(r'^webhook/$', webhook, name='webhook'),
diff --git a/src/pretix/plugins/stripe/views.py b/src/pretix/plugins/stripe/views.py
index e7e470ea3..1209c55c2 100644
--- a/src/pretix/plugins/stripe/views.py
+++ b/src/pretix/plugins/stripe/views.py
@@ -1,12 +1,13 @@
 import json
 import logging
+
+import stripe
 from django.http import HttpResponse
 from django.views.decorators.csrf import csrf_exempt
 from django.views.decorators.http import require_POST
-from pretix.base.models import Order, Event
-from pretix.plugins.stripe.payment import Stripe
-import stripe
 
+from pretix.base.models import Event, Order
+from pretix.plugins.stripe.payment import Stripe
 
 logger = logging.getLogger('pretix.plugins.stripe')
 
diff --git a/src/pretix/plugins/ticketoutputpdf/__init__.py b/src/pretix/plugins/ticketoutputpdf/__init__.py
index c3184a474..c0cf5c3c2 100644
--- a/src/pretix/plugins/ticketoutputpdf/__init__.py
+++ b/src/pretix/plugins/ticketoutputpdf/__init__.py
@@ -1,6 +1,7 @@
 from django.apps import AppConfig
 from django.utils.functional import cached_property
 from django.utils.translation import ugettext_lazy as _
+
 from pretix.base.plugins import PluginType
 
 
diff --git a/src/pretix/plugins/ticketoutputpdf/ticketoutput.py b/src/pretix/plugins/ticketoutputpdf/ticketoutput.py
index 1ec4c6952..02fdcd7b2 100644
--- a/src/pretix/plugins/ticketoutputpdf/ticketoutput.py
+++ b/src/pretix/plugins/ticketoutputpdf/ticketoutput.py
@@ -1,11 +1,11 @@
-from io import BytesIO
 import logging
+from io import BytesIO
 
 from django.contrib.staticfiles import finders
 from django.http import HttpResponse
 from django.utils.translation import ugettext_lazy as _
-from pretix.base.ticketoutput import BaseTicketOutput
 
+from pretix.base.ticketoutput import BaseTicketOutput
 
 logger = logging.getLogger('pretix.plugins.ticketoutputpdf')
 
diff --git a/src/pretix/plugins/timerestriction/__init__.py b/src/pretix/plugins/timerestriction/__init__.py
index 6d7bdba91..e78bb750f 100644
--- a/src/pretix/plugins/timerestriction/__init__.py
+++ b/src/pretix/plugins/timerestriction/__init__.py
@@ -1,5 +1,6 @@
 from django.apps import AppConfig
 from django.utils.translation import ugettext_lazy as _
+
 from pretix.base.plugins import PluginType
 
 
diff --git a/src/pretix/plugins/timerestriction/migrations/0001_initial.py b/src/pretix/plugins/timerestriction/migrations/0001_initial.py
index 073ce668c..3e1ff4be6 100644
--- a/src/pretix/plugins/timerestriction/migrations/0001_initial.py
+++ b/src/pretix/plugins/timerestriction/migrations/0001_initial.py
@@ -1,9 +1,10 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
-import pretix.base.models
 import versions.models
+from django.db import migrations, models
+
+import pretix.base.models
 
 
 class Migration(migrations.Migration):
diff --git a/src/pretix/plugins/timerestriction/signals.py b/src/pretix/plugins/timerestriction/signals.py
index 43ff6bddb..646f68c21 100644
--- a/src/pretix/plugins/timerestriction/signals.py
+++ b/src/pretix/plugins/timerestriction/signals.py
@@ -1,11 +1,11 @@
 from django.dispatch import receiver
+from django.forms.models import inlineformset_factory
 from django.utils.timezone import now
 from django.utils.translation import ugettext_lazy as _
-from django.forms.models import inlineformset_factory
 
-from pretix.base.signals import determine_availability
 from pretix.base.models import Item
-from pretix.control.forms import RestrictionInlineFormset, RestrictionForm
+from pretix.base.signals import determine_availability
+from pretix.control.forms import RestrictionForm, RestrictionInlineFormset
 from pretix.control.signals import restriction_formset
 
 from .models import TimeRestriction
diff --git a/src/pretix/presale/context.py b/src/pretix/presale/context.py
index a54e9b742..e898a0000 100644
--- a/src/pretix/presale/context.py
+++ b/src/pretix/presale/context.py
@@ -1,4 +1,5 @@
 from django.core.urlresolvers import resolve
+
 from .signals import html_head
 
 
diff --git a/src/pretix/presale/forms/auth.py b/src/pretix/presale/forms/auth.py
index 4770d176e..e9bbb5e27 100644
--- a/src/pretix/presale/forms/auth.py
+++ b/src/pretix/presale/forms/auth.py
@@ -1,10 +1,12 @@
-from django.contrib.auth import authenticate
-from django.core.validators import RegexValidator
 from django import forms
-from django.forms import Form
-from django.contrib.auth.forms import AuthenticationForm as BaseAuthenticationForm
-from django.utils.translation import ugettext_lazy as _
 from django.conf import settings
+from django.contrib.auth import authenticate
+from django.contrib.auth.forms import \
+    AuthenticationForm as BaseAuthenticationForm
+from django.core.validators import RegexValidator
+from django.forms import Form
+from django.utils.translation import ugettext_lazy as _
+
 from pretix.base.models import User
 
 
diff --git a/src/pretix/presale/forms/checkout.py b/src/pretix/presale/forms/checkout.py
index d278825b8..4b8660fa6 100644
--- a/src/pretix/presale/forms/checkout.py
+++ b/src/pretix/presale/forms/checkout.py
@@ -1,5 +1,6 @@
 from django import forms
 from django.utils.translation import ugettext_lazy as _
+
 from pretix.base.models import Question
 
 
diff --git a/src/pretix/presale/signals.py b/src/pretix/presale/signals.py
index aa760970c..b7c9e524b 100644
--- a/src/pretix/presale/signals.py
+++ b/src/pretix/presale/signals.py
@@ -1,6 +1,5 @@
 from pretix.base.signals import EventPluginSignal
 
-
 """
 This signal is sent out to include code into the HTML <head> tag
 """
diff --git a/src/pretix/presale/urls.py b/src/pretix/presale/urls.py
index bdb6e1eea..dbc648116 100644
--- a/src/pretix/presale/urls.py
+++ b/src/pretix/presale/urls.py
@@ -1,11 +1,10 @@
-from django.conf.urls import url, include
+from django.conf.urls import include, url
 
-import pretix.presale.views.event
 import pretix.presale.views.cart
 import pretix.presale.views.checkout
-import pretix.presale.views.order
+import pretix.presale.views.event
 import pretix.presale.views.locale
-
+import pretix.presale.views.order
 
 urlpatterns = [
     url(r'^(?P<organizer>[^/]+)/(?P<event>[^/]+)/', include([
diff --git a/src/pretix/presale/views/__init__.py b/src/pretix/presale/views/__init__.py
index 7223c86e8..517d50301 100644
--- a/src/pretix/presale/views/__init__.py
+++ b/src/pretix/presale/views/__init__.py
@@ -1,8 +1,8 @@
-from itertools import groupby
 from datetime import timedelta
+from itertools import groupby
+
 from django.contrib.auth.views import redirect_to_login
 from django.core.urlresolvers import reverse
-
 from django.db.models import Q
 from django.utils.functional import cached_property
 from django.utils.timezone import now
diff --git a/src/pretix/presale/views/cart.py b/src/pretix/presale/views/cart.py
index 1fed08080..ff22af4a6 100644
--- a/src/pretix/presale/views/cart.py
+++ b/src/pretix/presale/views/cart.py
@@ -1,5 +1,5 @@
-from datetime import timedelta
 import json
+from datetime import timedelta
 
 from django.contrib import messages
 from django.contrib.auth.views import redirect_to_login
@@ -7,10 +7,10 @@ from django.core.urlresolvers import reverse
 from django.db.models import Q
 from django.shortcuts import redirect
 from django.utils.timezone import now
-from django.views.generic import View
 from django.utils.translation import ugettext_lazy as _
+from django.views.generic import View
 
-from pretix.base.models import Item, ItemVariation, Quota, CartPosition
+from pretix.base.models import CartPosition, Item, ItemVariation, Quota
 from pretix.presale.views import EventLoginRequiredMixin, EventViewMixin
 
 
diff --git a/src/pretix/presale/views/checkout.py b/src/pretix/presale/views/checkout.py
index ed200746f..f79520e7f 100644
--- a/src/pretix/presale/views/checkout.py
+++ b/src/pretix/presale/views/checkout.py
@@ -4,13 +4,16 @@ from django.db.models import Q, Sum
 from django.http import HttpRequest
 from django.shortcuts import redirect
 from django.utils.functional import cached_property
-from django.views.generic import TemplateView
 from django.utils.translation import ugettext_lazy as _
-from pretix.base.models import CartPosition, QuestionAnswer, OrderPosition
-from pretix.base.services.orders import perform_order, OrderError
+from django.views.generic import TemplateView
+
+from pretix.base.models import CartPosition, OrderPosition, QuestionAnswer
+from pretix.base.services.orders import OrderError, perform_order
 from pretix.base.signals import register_payment_providers
 from pretix.presale.forms.checkout import QuestionsForm
-from pretix.presale.views import EventViewMixin, CartDisplayMixin, EventLoginRequiredMixin
+from pretix.presale.views import (
+    CartDisplayMixin, EventLoginRequiredMixin, EventViewMixin,
+)
 
 
 class CheckoutView(TemplateView):
diff --git a/src/pretix/presale/views/event.py b/src/pretix/presale/views/event.py
index 567f0e1c6..9847184ea 100644
--- a/src/pretix/presale/views/event.py
+++ b/src/pretix/presale/views/event.py
@@ -1,25 +1,30 @@
 import json
 
+from django.conf import settings
 from django.contrib import messages
-from django.contrib.auth import authenticate, logout, update_session_auth_hash
+from django.contrib.auth import (
+    authenticate, login, logout, update_session_auth_hash,
+)
 from django.core import signing
-from django.core.signing import SignatureExpired, BadSignature
+from django.core.signing import BadSignature, SignatureExpired
 from django.core.urlresolvers import reverse
 from django.db.models import Count
 from django.shortcuts import redirect
 from django.utils.functional import cached_property
-from django.contrib.auth import login
-from django.views.generic import TemplateView, View, UpdateView
 from django.utils.translation import ugettext_lazy as _
-from django.conf import settings
+from django.views.generic import TemplateView, UpdateView, View
+
 from pretix.base.forms.user import UserSettingsForm
-from pretix.base.services.mail import mail
 from pretix.base.models import User
+from pretix.base.services.mail import mail
 from pretix.helpers.urls import build_absolute_uri
-from pretix.presale.forms.auth import GlobalRegistrationForm, LocalRegistrationForm, PasswordForgotForm, \
-    PasswordRecoverForm
-from pretix.presale.forms.auth import LoginForm
-from pretix.presale.views import EventViewMixin, CartDisplayMixin, EventLoginRequiredMixin
+from pretix.presale.forms.auth import (
+    GlobalRegistrationForm, LocalRegistrationForm, LoginForm,
+    PasswordForgotForm, PasswordRecoverForm,
+)
+from pretix.presale.views import (
+    CartDisplayMixin, EventLoginRequiredMixin, EventViewMixin,
+)
 from pretix.presale.views.cart import CartAdd
 
 
diff --git a/src/pretix/presale/views/locale.py b/src/pretix/presale/views/locale.py
index c5c285319..9f58073df 100644
--- a/src/pretix/presale/views/locale.py
+++ b/src/pretix/presale/views/locale.py
@@ -1,4 +1,5 @@
 from datetime import datetime, timedelta
+
 from django.conf import settings
 from django.shortcuts import redirect
 from django.views.generic import View
diff --git a/src/pretix/presale/views/order.py b/src/pretix/presale/views/order.py
index 94f64ab9e..67b09ee02 100644
--- a/src/pretix/presale/views/order.py
+++ b/src/pretix/presale/views/order.py
@@ -1,14 +1,19 @@
 from django.contrib import messages
 from django.core.urlresolvers import reverse
+from django.http import HttpResponseForbidden, HttpResponseNotFound
 from django.shortcuts import redirect
+from django.utils.functional import cached_property
 from django.utils.timezone import now
 from django.utils.translation import ugettext_lazy as _
-from django.utils.functional import cached_property
 from django.views.generic import TemplateView, View
-from django.http import HttpResponseNotFound, HttpResponseForbidden
+
 from pretix.base.models import Order, OrderPosition
-from pretix.base.signals import register_payment_providers, register_ticket_outputs
-from pretix.presale.views import EventViewMixin, EventLoginRequiredMixin, CartDisplayMixin
+from pretix.base.signals import (
+    register_payment_providers, register_ticket_outputs,
+)
+from pretix.presale.views import (
+    CartDisplayMixin, EventLoginRequiredMixin, EventViewMixin,
+)
 from pretix.presale.views.checkout import QuestionsViewMixin
 
 
diff --git a/src/pretix/settings.py b/src/pretix/settings.py
index 00fafa99a..32ed5bdef 100644
--- a/src/pretix/settings.py
+++ b/src/pretix/settings.py
@@ -1,6 +1,9 @@
 import configparser
 import os
+
+from django.contrib.messages import constants as messages  # NOQA
 from django.utils.crypto import get_random_string
+from django.utils.translation import ugettext_lazy as _  # NOQA
 
 config = configparser.ConfigParser()
 config.read(['/etc/pretix/pretix.cfg', os.path.expanduser('~/.pretix.cfg'), 'pretix.cfg'],
@@ -160,7 +163,6 @@ LOCALE_PATHS = (
     'locale',
 )
 
-from django.utils.translation import ugettext_lazy as _  # NOQA
 LANGUAGES = (
     ('en', _('English')),
     ('de', _('German')),
@@ -237,7 +239,6 @@ DEBUG_TOOLBAR_CONFIG = {
 
 INTERNAL_IPS = ('127.0.0.1', '::1')
 
-from django.contrib.messages import constants as messages  # NOQA
 MESSAGE_TAGS = {
     messages.INFO: 'alert-info',
     messages.ERROR: 'alert-danger',
diff --git a/src/pretix/urls.py b/src/pretix/urls.py
index 9ac413d41..896e78d1c 100644
--- a/src/pretix/urls.py
+++ b/src/pretix/urls.py
@@ -1,12 +1,12 @@
 import importlib
+
 from django.apps import apps
-from django.conf.urls import include, url
 from django.conf import settings
+from django.conf.urls import include, url
 
 import pretix.control.urls
 import pretix.presale.urls
 
-
 urlpatterns = [
     url(r'^control/', include(pretix.control.urls, namespace='control')),
     # The pretixpresale namespace is configured at the bottom of this file, because it
diff --git a/src/requirements/testing.txt b/src/requirements/testing.txt
index 82da81717..11690e820 100644
--- a/src/requirements/testing.txt
+++ b/src/requirements/testing.txt
@@ -8,6 +8,7 @@ coverage
 selenium
 pytest
 pytest-django
+isort
 # PyVirtualDisplay
 # -e git+https://github.com/pretix/sauceclient.git@master#egg=sauceclient
 # travis
diff --git a/src/setup.cfg b/src/setup.cfg
index 7a50a192b..9e65f4ea3 100644
--- a/src/setup.cfg
+++ b/src/setup.cfg
@@ -3,3 +3,12 @@ ignore = N802,W503
 max-line-length = 160
 exclude = migrations,.ropeproject,static,mt940.py,_static
 max-complexity = 11
+
+[isort]
+combine_as_imports = true
+default_section = THIRDPARTY
+include_trailing_comma = true
+known_first_party = pretix
+multi_line_output = 5
+not_skip = __init__.py
+skip = make_testdata.py,wsgi.py,bootstrap
diff --git a/src/setup.py b/src/setup.py
index 8e3bf8d83..de852cc1c 100644
--- a/src/setup.py
+++ b/src/setup.py
@@ -1,9 +1,11 @@
+
 # Always prefer setuptools over distutils
-from setuptools import setup, find_packages
 # To use a consistent encoding
 from codecs import open
 from os import path
 
+from setuptools import find_packages, setup
+
 here = path.abspath(path.dirname(__file__))
 
 # Get the long description from the relevant file
diff --git a/src/tests/base/__init__.py b/src/tests/base/__init__.py
index 7f3b6f7b4..f72f5d583 100644
--- a/src/tests/base/__init__.py
+++ b/src/tests/base/__init__.py
@@ -1,12 +1,11 @@
 import os
 import sys
 import time
-from django.contrib.staticfiles.testing import StaticLiveServerTestCase
 
 from django.conf import settings
+from django.contrib.staticfiles.testing import StaticLiveServerTestCase
 from selenium import webdriver
 
-
 # could use Chrome, Firefox, etc... here
 BROWSER = os.environ.get('TEST_BROWSER', 'PhantomJS')
 
diff --git a/src/tests/base/test_cache.py b/src/tests/base/test_cache.py
index 31f6c645f..77b2217ac 100644
--- a/src/tests/base/test_cache.py
+++ b/src/tests/base/test_cache.py
@@ -1,7 +1,7 @@
 import random
 
-from django.test import TestCase
 from django.core.cache import cache as django_cache
+from django.test import TestCase
 from django.utils.timezone import now
 
 from pretix.base.models import Event, Organizer
diff --git a/src/tests/base/test_i18n.py b/src/tests/base/test_i18n.py
index ebaaebb51..ccf1a9236 100644
--- a/src/tests/base/test_i18n.py
+++ b/src/tests/base/test_i18n.py
@@ -1,9 +1,9 @@
 from django.test import TestCase
 from django.utils import translation
 from django.utils.timezone import now
-from pretix.base.i18n import LazyI18nString
 
-from pretix.base.models import Event, Organizer, ItemCategory
+from pretix.base.i18n import LazyI18nString
+from pretix.base.models import Event, ItemCategory, Organizer
 
 
 class I18nStringTest(TestCase):
diff --git a/src/tests/base/test_mail.py b/src/tests/base/test_mail.py
index 688dcf326..61e4cd6db 100644
--- a/src/tests/base/test_mail.py
+++ b/src/tests/base/test_mail.py
@@ -1,8 +1,8 @@
-from django.conf import settings
-from django.utils.timezone import now
-from django.core import mail as djmail
-from django.utils.translation import ugettext_lazy as _
 import pytest
+from django.conf import settings
+from django.core import mail as djmail
+from django.utils.timezone import now
+from django.utils.translation import ugettext_lazy as _
 
 from pretix.base.models import Event, Organizer, User
 from pretix.base.services.mail import mail
diff --git a/src/tests/base/test_middleware.py b/src/tests/base/test_middleware.py
index 3f6b4c0b8..375a83289 100644
--- a/src/tests/base/test_middleware.py
+++ b/src/tests/base/test_middleware.py
@@ -1,6 +1,6 @@
-from django.test import TestCase, Client
-from django.utils.timezone import now
 from django.conf import settings
+from django.test import Client, TestCase
+from django.utils.timezone import now
 
 from pretix.base.models import Event, Organizer, User
 
diff --git a/src/tests/base/test_models.py b/src/tests/base/test_models.py
index beca551ce..11e8bb1b6 100644
--- a/src/tests/base/test_models.py
+++ b/src/tests/base/test_models.py
@@ -2,10 +2,11 @@ from datetime import timedelta
 
 from django.test import TestCase
 from django.utils.timezone import now
+
 from pretix.base.models import (
-    Event, Organizer, Item, ItemVariation,
-    Property, PropertyValue, User, Quota,
-    Order, OrderPosition, CartPosition, Question)
+    CartPosition, Event, Item, ItemVariation, Order, OrderPosition, Organizer,
+    Property, PropertyValue, Question, Quota, User,
+)
 from pretix.base.services.orders import mark_order_paid
 from pretix.base.types import VariationDict
 
diff --git a/src/tests/base/test_plugins.py b/src/tests/base/test_plugins.py
index 2ffe6e35c..728a8cb63 100644
--- a/src/tests/base/test_plugins.py
+++ b/src/tests/base/test_plugins.py
@@ -1,6 +1,6 @@
+from django.conf import settings
 from django.test import TestCase
 from django.utils.timezone import now
-from django.conf import settings
 
 from pretix.base.models import Event, Organizer
 from pretix.base.plugins import get_all_plugins
diff --git a/src/tests/base/test_settings.py b/src/tests/base/test_settings.py
index 1aaaf024c..eca0e3ad7 100644
--- a/src/tests/base/test_settings.py
+++ b/src/tests/base/test_settings.py
@@ -1,10 +1,11 @@
-from datetime import datetime, time, date
+from datetime import date, datetime, time
 from decimal import Decimal
+
 from django.test import TestCase
 from django.utils.timezone import now
 
-from pretix.base.models import Event, Organizer, User, OrganizerSetting
 from pretix.base import settings
+from pretix.base.models import Event, Organizer, OrganizerSetting, User
 from pretix.base.settings import SettingsSandbox
 
 
diff --git a/src/tests/control/test_auth.py b/src/tests/control/test_auth.py
index c5237ac54..7ee23d446 100644
--- a/src/tests/control/test_auth.py
+++ b/src/tests/control/test_auth.py
@@ -1,7 +1,7 @@
-from django.test import TestCase, Client
+from django.test import Client, TestCase
+from tests.base import BrowserTest
 
 from pretix.base.models import User
-from tests.base import BrowserTest
 
 
 class LoginFormBrowserTest(BrowserTest):
diff --git a/src/tests/control/test_events.py b/src/tests/control/test_events.py
index 64d26fa2f..1d92084a4 100644
--- a/src/tests/control/test_events.py
+++ b/src/tests/control/test_events.py
@@ -1,7 +1,11 @@
 import datetime
-from pretix.base.models import User, Organizer, Event, OrganizerPermission, EventPermission
+
 from tests.base import BrowserTest
 
+from pretix.base.models import (
+    Event, EventPermission, Organizer, OrganizerPermission, User,
+)
+
 
 class EventsTest(BrowserTest):
 
diff --git a/src/tests/control/test_items.py b/src/tests/control/test_items.py
index b767d1ca8..50d9b7775 100644
--- a/src/tests/control/test_items.py
+++ b/src/tests/control/test_items.py
@@ -1,13 +1,17 @@
+import datetime
 import os
 import time
-import datetime
 import unittest
+
 from django.utils.timezone import now
 from selenium.webdriver.support.select import Select
-from pretix.base.models import User, Organizer, Event, OrganizerPermission, EventPermission, ItemCategory, Property, \
-    PropertyValue, Question, Quota, Item
 from tests.base import BrowserTest
 
+from pretix.base.models import (
+    Event, EventPermission, Item, ItemCategory, Organizer, OrganizerPermission,
+    Property, PropertyValue, Question, Quota, User,
+)
+
 
 class ItemFormTest(BrowserTest):
     def setUp(self):
diff --git a/src/tests/control/test_orders.py b/src/tests/control/test_orders.py
index d8ac75983..74c7007fa 100644
--- a/src/tests/control/test_orders.py
+++ b/src/tests/control/test_orders.py
@@ -1,9 +1,13 @@
 from datetime import timedelta
 from decimal import Decimal
 
-from django.utils.timezone import now
 import pytest
-from pretix.base.models import Event, Organizer, User, EventPermission, Order, OrganizerPermission, Item, OrderPosition
+from django.utils.timezone import now
+
+from pretix.base.models import (
+    Event, EventPermission, Item, Order, OrderPosition, Organizer,
+    OrganizerPermission, User,
+)
 
 
 @pytest.fixture
diff --git a/src/tests/control/test_permissions.py b/src/tests/control/test_permissions.py
index be6069ac7..ee49a07cd 100644
--- a/src/tests/control/test_permissions.py
+++ b/src/tests/control/test_permissions.py
@@ -1,8 +1,11 @@
 from datetime import timedelta
 
-from django.utils.timezone import now
 import pytest
-from pretix.base.models import Event, Organizer, User, EventPermission, Order, OrganizerPermission
+from django.utils.timezone import now
+
+from pretix.base.models import (
+    Event, EventPermission, Order, Organizer, OrganizerPermission, User,
+)
 
 
 @pytest.fixture
diff --git a/src/tests/control/test_user.py b/src/tests/control/test_user.py
index 9c46429bd..212fe4326 100644
--- a/src/tests/control/test_user.py
+++ b/src/tests/control/test_user.py
@@ -1,6 +1,7 @@
-from pretix.base.models import User
 from tests.base import BrowserTest
 
+from pretix.base.models import User
+
 
 class UserSettingsTest(BrowserTest):
     def setUp(self):
diff --git a/src/tests/helpers/test_urls.py b/src/tests/helpers/test_urls.py
index f6725f624..6894a7e33 100644
--- a/src/tests/helpers/test_urls.py
+++ b/src/tests/helpers/test_urls.py
@@ -1,7 +1,8 @@
 from django.conf import settings
-from pretix.helpers.urls import build_absolute_uri
 from django.core import urlresolvers
 
+from pretix.helpers.urls import build_absolute_uri
+
 
 def test_site_url_domain():
     settings.SITE_URL = 'https://example.com'
diff --git a/src/tests/plugins/banktransfer/test_csvimport.py b/src/tests/plugins/banktransfer/test_csvimport.py
index 4141784b9..655417eb6 100644
--- a/src/tests/plugins/banktransfer/test_csvimport.py
+++ b/src/tests/plugins/banktransfer/test_csvimport.py
@@ -1,4 +1,5 @@
 import os.path
+
 from django.test import TestCase
 
 # Do NOT use relative imports here
diff --git a/src/tests/plugins/test_timerestriction.py b/src/tests/plugins/test_timerestriction.py
index 1194a3014..d1706e124 100644
--- a/src/tests/plugins/test_timerestriction.py
+++ b/src/tests/plugins/test_timerestriction.py
@@ -4,9 +4,8 @@ from django.test import TestCase
 from django.utils.timezone import now
 
 from pretix.base.models import (
-    Event, Organizer, Item, Property, PropertyValue, ItemVariation
+    Event, Item, ItemVariation, Organizer, Property, PropertyValue,
 )
-
 # Do NOT use relative imports here
 from pretix.plugins.timerestriction import signals
 from pretix.plugins.timerestriction.models import TimeRestriction
diff --git a/src/tests/presale/test_account.py b/src/tests/presale/test_account.py
index eb84d6890..d4a50b0a6 100644
--- a/src/tests/presale/test_account.py
+++ b/src/tests/presale/test_account.py
@@ -1,8 +1,10 @@
 import time
-from pretix.base.models import User
+
 from tests.base import BrowserTest
 from tests.presale.test_event import EventTestMixin
 
+from pretix.base.models import User
+
 
 class UserSettingsTest(EventTestMixin, BrowserTest):
     def setUp(self):
diff --git a/src/tests/presale/test_cart.py b/src/tests/presale/test_cart.py
index 88242782a..3df5af791 100644
--- a/src/tests/presale/test_cart.py
+++ b/src/tests/presale/test_cart.py
@@ -1,14 +1,17 @@
 import datetime
 import time
+from datetime import timedelta
+
 from bs4 import BeautifulSoup
 from django.test import TestCase
 from django.utils.timezone import now
-from datetime import timedelta
-
-from pretix.base.models import Item, Organizer, Event, ItemCategory, Quota, Property, PropertyValue, ItemVariation, User, \
-    CartPosition, Question, QuestionAnswer
 from tests.base import BrowserTest
 
+from pretix.base.models import (
+    CartPosition, Event, Item, ItemCategory, ItemVariation, Organizer,
+    Property, PropertyValue, Question, QuestionAnswer, Quota, User,
+)
+
 
 class CartTestMixin:
 
diff --git a/src/tests/presale/test_checkout.py b/src/tests/presale/test_checkout.py
index 0cf879ec6..aa230bcca 100644
--- a/src/tests/presale/test_checkout.py
+++ b/src/tests/presale/test_checkout.py
@@ -1,11 +1,14 @@
 import datetime
+from datetime import timedelta
+
 from bs4 import BeautifulSoup
 from django.test import TestCase
 from django.utils.timezone import now
-from datetime import timedelta
 
-from pretix.base.models import Item, Organizer, Event, ItemCategory, Quota, User, \
-    CartPosition, Question, Order, OrderPosition
+from pretix.base.models import (
+    CartPosition, Event, Item, ItemCategory, Order, OrderPosition, Organizer,
+    Question, Quota, User,
+)
 
 
 class CheckoutTestCase(TestCase):
diff --git a/src/tests/presale/test_event.py b/src/tests/presale/test_event.py
index 97c85f195..8dfb31851 100644
--- a/src/tests/presale/test_event.py
+++ b/src/tests/presale/test_event.py
@@ -1,11 +1,15 @@
 import datetime
 import time
+
 from django.test import TestCase
 from django.utils.timezone import now
-
-from pretix.base.models import Item, Organizer, Event, ItemCategory, Quota, Property, PropertyValue, ItemVariation, User
 from tests.base import BrowserTest
 
+from pretix.base.models import (
+    Event, Item, ItemCategory, ItemVariation, Organizer, Property,
+    PropertyValue, Quota, User,
+)
+
 
 class EventTestMixin:
 
diff --git a/src/tests/presale/test_orders.py b/src/tests/presale/test_orders.py
index b4392af6c..95a74f7a4 100644
--- a/src/tests/presale/test_orders.py
+++ b/src/tests/presale/test_orders.py
@@ -1,11 +1,14 @@
 import datetime
 from decimal import Decimal
+
 from bs4 import BeautifulSoup
 from django.test import TestCase
 from django.utils.timezone import now
 
-from pretix.base.models import Organizer, Event, Order, User, ItemCategory, Quota, Item, Property, PropertyValue, \
-    ItemVariation, OrderPosition, Question
+from pretix.base.models import (
+    Event, Item, ItemCategory, ItemVariation, Order, OrderPosition, Organizer,
+    Property, PropertyValue, Question, Quota, User,
+)
 
 
 class OrdersTest(TestCase):
diff --git a/src/tests/testdummy/__init__.py b/src/tests/testdummy/__init__.py
index f7826d906..36e1199dd 100644
--- a/src/tests/testdummy/__init__.py
+++ b/src/tests/testdummy/__init__.py
@@ -1,4 +1,5 @@
 from django.apps import AppConfig
+
 from pretix.base.plugins import PluginType
 
 
diff --git a/src/tests/testdummy/ticketoutput.py b/src/tests/testdummy/ticketoutput.py
index eff6df15f..680cfe2ae 100644
--- a/src/tests/testdummy/ticketoutput.py
+++ b/src/tests/testdummy/ticketoutput.py
@@ -1,8 +1,8 @@
 import logging
 
 from django.http import HttpResponse
-from pretix.base.ticketoutput import BaseTicketOutput
 
+from pretix.base.ticketoutput import BaseTicketOutput
 
 logger = logging.getLogger('tests.testdummy.ticketoutput')