Fix lint 3

app/app/tests.py

@@ -1,6 +1,7 @@
 from django.test import SimpleTestCase
 from app import calc
 
+
 class CalcTests(SimpleTestCase):
     """Test calc module"""
 

app/core/management/commands/wait_for_db.py

@@ -1,9 +1,9 @@
-
 import time
 from psycopg2 import OperationalError as Psycopg20pError
 from django.db.utils import OperationalError
 from django.core.management.base import BaseCommand
 
+
 class Command(BaseCommand):
     def handle(self, *args, **optional):
         self.stdout.write('Waiting for database...')

app/core/tests/test_commands.py

@@ -4,6 +4,7 @@
 from django.db.utils import OperationalError
 from django.test import SimpleTestCase
 
+
 @patch('core.management.commands.wait_for_db.Command.check')
 class CommandTest(SimpleTestCase):
     def test_wait_for_db_ready(self, patched_check):