Add missing space

core/tests/lib/test_market.py

@@ -1,7 +1,10 @@
-from django.test import TestCase
-from core.models import TradingTime, User
 from datetime import datetime, time
 
+from django.test import TestCase
+
+from core.models import TradingTime, User
+
+
 class MarketTestCase(TestCase):
     def setUp(self):
         # Create a test user