old_contents: # -*- coding: utf-8 -*-
  # Generated by Django 1.9.9 on 2016-10-23 12:29
  from __future__ import unicode_literals
  
  from django.db import migrations
  from django.core.management.sql import emit_post_migrate_signal
  
  
  class Migration(migrations.Migration):
      def remove_user_permission_for_moderator_group(apps, schema_editor):
          db_alias = schema_editor.connection.alias
          try:
              # Django 1.9
              emit_post_migrate_signal(2, False, db_alias)
          except TypeError:
              # Django < 1.9
              try:
                  # Django 1.8
                  emit_post_migrate_signal(2, False, 'default', db_alias)
              except TypeError:  # Django < 1.8
                  emit_post_migrate_signal([], 2, False, 'default', db_alias)
  
          Group = apps.get_model('auth.Group')
          Permission = apps.get_model('auth.Permission')
  
  
          # <- Moderator ->
  
          moderator_group = Group.objects.get(name='Moderators')
  
          change_user = Permission.objects.get(codename='change_user')
          moderator_group.permissions.remove(change_user)
  
  
      dependencies = [
          ('core', '0050_data_migration_promoted_articles'),
          ('contenttypes', '__latest__'),
          ('wagtailcore', '__latest__'),
          ('wagtailadmin', '__latest__'),
          ('wagtailusers', '__latest__'),
          ('sites', '__latest__'),
          ('auth', '__latest__'),
      ]
  
      operations = [
          migrations.RunPython(remove_user_permission_for_moderator_group),
      ]
  
new_contents: # -*- coding: utf-8 -*-
  # Generated by Django 1.9.9 on 2016-10-23 12:29
  from __future__ import unicode_literals
  
  from django.db import migrations
  from django.core.management.sql import emit_post_migrate_signal
  
  
  class Migration(migrations.Migration):
      def remove_user_permission_for_moderator_group(apps, schema_editor):
          db_alias = schema_editor.connection.alias
          try:
              # Django 1.9
              emit_post_migrate_signal(2, False, db_alias)
          except TypeError:
              # Django < 1.9
              try:
                  # Django 1.8
                  emit_post_migrate_signal(2, False, 'default', db_alias)
              except TypeError:  # Django < 1.8
                  emit_post_migrate_signal([], 2, False, 'default', db_alias)
  
          Group = apps.get_model('auth.Group')
          Permission = apps.get_model('auth.Permission')
  
  
          # <- Moderator ->
          moderator_group = Group.objects.filter(name='Moderators')
          if moderator_group:
              change_user = Permission.objects.get(codename='change_user')
              moderator_group.permissions.remove(change_user)
  
      dependencies = [
          ('core', '0050_data_migration_promoted_articles'),
          ('contenttypes', '__latest__'),
          ('wagtailcore', '__latest__'),
          ('wagtailadmin', '__latest__'),
          ('wagtailusers', '__latest__'),
          ('sites', '__latest__'),
          ('auth', '__latest__'),
      ]
  
      operations = [
          migrations.RunPython(remove_user_permission_for_moderator_group),
      ]
  
subject: use .filter instead of .get