Migrate source code to python 3.7 and refine code style

accounts/migrations/0001_initial.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 from django.conf import settings
 

accounts/migrations/0002_auto_20150325_0846.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations
 
 

accounts/migrations/0003_usersshkey.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 from django.conf import settings
 

accounts/migrations/0004_userattributes.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 from django.conf import settings
 

accounts/migrations/0004_userinstance_is_vnc.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 

accounts/migrations/0005_userattributes_can_clone_instances.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 
 

accounts/migrations/0006_userattributes_max_disk_size.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import models, migrations
 
 

accounts/migrations/0007_auto_20160426_0635.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 

accounts/migrations/0008_merge.py

@@ -1,7 +1,4 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
-from django.db import migrations, models
+from django.db import migrations
 
 
 class Migration(migrations.Migration):
@@ -10,6 +7,3 @@ class Migration(migrations.Migration):
         ('accounts', '0004_userinstance_is_vnc'),
         ('accounts', '0007_auto_20160426_0635'),
     ]
-
-    operations = [
-    ]

accounts/migrations/0009_auto_20171026_0805.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 

accounts/migrations/0010_auto_20180625_1236.py

@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.11.13 on 2018-06-25 12:36
-from __future__ import unicode_literals
-
 from django.db import migrations, models
 
 

accounts/migrations/0011_auto_20180625_1313.py

@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.11.13 on 2018-06-25 13:13
-from __future__ import unicode_literals
-
 import django.core.validators
 from django.db import migrations, models
 

accounts/migrations/0012_auto_20180625_1331.py

@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.11.13 on 2018-06-25 13:31
-from __future__ import unicode_literals
-
 import django.core.validators
 from django.db import migrations, models
 import re

accounts/migrations/0013_auto_20180625_1358.py

@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.11.13 on 2018-06-25 13:58
-from __future__ import unicode_literals
-
 import django.core.validators
 from django.db import migrations, models
 import re

accounts/migrations/0014_auto_20180808_1436.py

@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.11.13 on 2018-08-08 11:36
-from __future__ import unicode_literals
-
 import django.core.validators
 from django.db import migrations, models
 

accounts/migrations/0015_auto_20180808_1449.py

@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-# Generated by Django 1.11.13 on 2018-08-08 11:49
-from __future__ import unicode_literals
-
 from django.conf import settings
 from django.db import migrations, models
 import django.db.models.deletion