Executed python-modernize and isort

on mentioned files in INCR-451
 Please enter the commit message for your changes. Lines starting

lms/djangoapps/badges/api/urls.py

 """
 URLs for badges API
 """
+from __future__ import absolute_import
+
 from django.conf import settings
 from django.conf.urls import url
 

lms/djangoapps/badges/migrations/0001_initial.py

 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
+from __future__ import absolute_import, unicode_literals
 
-from django.db import migrations, models
+import django.utils.timezone
 import jsonfield.fields
-import badges.models
 from django.conf import settings
-import django.utils.timezone
+from django.db import migrations, models
 from model_utils import fields
 from opaque_keys.edx.django.models import CourseKeyField
 
+import badges.models
+
 
 class Migration(migrations.Migration):
 

lms/djangoapps/badges/migrations/0002_data__migrate_assertions.py

 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
+from __future__ import absolute_import, unicode_literals
 
 import json
-from datetime import datetime
-
 import os
 import time
+from datetime import datetime
+
+import six
 from django.db import migrations, models
 
 
@@ -44,7 +45,7 @@ def forwards(apps, schema_editor):
             badge_class.image.name = icon.name
             badge_class.save()
             classes[(badge.course_id, badge.mode)] = badge_class
-        if isinstance(badge.data, basestring):
+        if isinstance(badge.data, six.string_types):
             data = badge.data
         else:
             data = json.dumps(badge.data)
@@ -82,7 +83,7 @@ def backwards(apps, schema_editor):
         if not badge.badge_class.mode:
             # Can't preserve old badges without modes.
             continue
-        if isinstance(badge.data, basestring):
+        if isinstance(badge.data, six.string_types):
             data = badge.data
         else:
             data = json.dumps(badge.data)

lms/djangoapps/badges/migrations/0003_schema__add_event_configuration.py

 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
+from __future__ import absolute_import, unicode_literals
 
-from django.db import migrations, models
 import django.db.models.deletion
 from django.conf import settings
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):