Fixed import sorting

src/pretix/base/migrations/0018_eventlock_token.py

@@ -1,9 +1,10 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
 import uuid
 
+from django.db import migrations, models
+
 
 class Migration(migrations.Migration):
 

src/pretix/base/services/locking.py

@@ -1,7 +1,7 @@
 import logging
 import time
-from datetime import timedelta
 import uuid
+from datetime import timedelta
 
 from django.conf import settings
 from django.db import transaction

src/tests/base/test_locking.py

@@ -1,8 +1,10 @@
 import time
-from django.utils.timezone import now
-from pretix.base.models import Event, Organizer, EventLock
-from pretix.base.services import locking
+
 import pytest
+from django.utils.timezone import now
+
+from pretix.base.models import Event, EventLock, Organizer
+from pretix.base.services import locking
 
 
 @pytest.fixture