satisfy linters

src/c3nav/control/forms.py

@@ -13,7 +13,6 @@ from django.forms import ChoiceField, Form, IntegerField, ModelForm, Select
 from django.utils import timezone
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ungettext_lazy
-from operator import attrgetter
 
 from c3nav.control.models import UserPermissions, UserSpaceAccess
 from c3nav.mapdata.forms import I18nModelFormMixin

src/c3nav/mapdata/management/commands/statssnapshot.py

@@ -1,5 +1,6 @@
 import json
 import os
+
 from django.conf import settings
 from django.core.management.base import BaseCommand
 from django.utils.translation import ugettext_lazy as _

src/c3nav/mapdata/render/engines/opengl.py

@@ -5,12 +5,12 @@ from itertools import chain
 from queue import Queue
 from typing import Optional
 
-import moderngl
 import numpy as np
 from PIL import Image
 from shapely.geometry import CAP_STYLE, JOIN_STYLE, Polygon
 from shapely.ops import unary_union
 
+import moderngl
 from c3nav.mapdata.render.engines.base import FillAttribs, StrokeAttribs
 from c3nav.mapdata.render.engines.base3d import Base3DEngine
 from c3nav.mapdata.render.geometry import HybridGeometry

src/c3nav/tileserver/wsgi.py

@@ -10,9 +10,9 @@ from datetime import datetime
 from email.utils import formatdate
 from io import BytesIO
 
-import pylibmc
 import requests
 
+import pylibmc
 from c3nav.mapdata.utils.cache import CachePackage
 from c3nav.mapdata.utils.tiles import (build_access_cache_key, build_base_cache_key, build_tile_etag, get_tile_bounds,
                                        parse_tile_access_cookie)