fix all pylint complaints

marietje/metrics/admin.py

@@ -1,3 +0,0 @@
-from django.contrib import admin
-
-# Register your models here.

marietje/metrics/models.py

@@ -1,3 +0,0 @@
-from django.db import models
-
-# Create your models here.

marietje/metrics/tests.py

@@ -1,3 +0,0 @@
-from django.test import TestCase
-
-# Create your tests here.

marietje/metrics/views.py

@@ -1,4 +1,3 @@
-from django.db.models import Count, Q
 from django.http import HttpResponse
 from django.db.utils import OperationalError
 
@@ -16,13 +15,12 @@ queue_users_gauge = Gauge('marietje_queue_users', 'Users holding a queue at some
 try:
     for queue in Queue.objects.all():
         def _get_queue_length():
-            return (PlaylistSong.objects.filter(playlist=queue.playlist_id, state=0)
-                                        .count())
+            return PlaylistSong.objects.filter(playlist=queue.playlist_id, state=0).count()
 
         def _get_queue_duration():
             playlist_songs = (PlaylistSong.objects.filter(playlist=queue.playlist_id, state=0)
-                                                  .select_related('song')
-                                                  .all())
+                              .select_related('song')
+                              .all())
             return sum(ps.song.duration for ps in playlist_songs)
 
         def _get_queue_distinct_users():
@@ -31,7 +29,7 @@ try:
             # that much of confidence that it would also work on mysql.
             # Furtermore, we do not expect the queue to be very long at any moment.
             return len(set(PlaylistSong.objects.filter(playlist=queue.playlist_id, state=0)
-                                               .values_list('user')))
+                           .values_list('user')))
 
         queue_length_gauge.labels(name=queue).set_function(_get_queue_length)
         queue_duration_gauge.labels(name=queue).set_function(_get_queue_duration)