diff --git a/core/models.py b/core/models.py
index 16717bc..37c18cd 100644
--- a/core/models.py
+++ b/core/models.py
@@ -281,7 +281,7 @@ class TradingTime(models.Model):
 
     def __str__(self):
         return (
-            f"{self.name} ({self.get_start_day_display()} at {self.start_time} -"
+            f"{self.name} ({self.get_start_day_display()} at {self.start_time} - "
             f"{self.get_end_day_display()} at {self.end_time})"
         )
 
diff --git a/core/tests/lib/test_market.py b/core/tests/lib/test_market.py
index b6e154b..1a0423a 100644
--- a/core/tests/lib/test_market.py
+++ b/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
@@ -22,11 +25,11 @@ class MarketTestCase(TestCase):
         test_time = datetime(2022, 11, 28, 10, 0, 0)
 
         trading_time = TradingTime.objects.create(
-            user = self.user,
-            start_day = 1,
-            end_day = 1,
-            start_time = self.time_9,
-            end_time = self.time_11,
+            user=self.user,
+            start_day=1,
+            end_day=1,
+            start_time=self.time_9,
+            end_time=self.time_11,
         )
 
         self.assertTrue(trading_time.within_range(test_time))
@@ -38,11 +41,11 @@ class MarketTestCase(TestCase):
         """
         test_time = datetime(2022, 11, 28, 10, 0, 0)
         trading_time = TradingTime.objects.create(
-            user = self.user,
-            start_day = 1,
-            end_day = 1,
-            start_time = self.time_14,
-            end_time = self.time_16,
+            user=self.user,
+            start_day=1,
+            end_day=1,
+            start_time=self.time_14,
+            end_time=self.time_16,
         )
 
         self.assertFalse(trading_time.within_range(test_time))
@@ -51,11 +54,11 @@ class MarketTestCase(TestCase):
         test_time = datetime(2022, 11, 28, 20, 0, 0)
 
         trading_time = TradingTime.objects.create(
-            user = self.user,
-            start_day = 1, # Monday
-            end_day = 6, # Saturday
-            start_time = self.time_9,
-            end_time = self.time_11,
+            user=self.user,
+            start_day=1,  # Monday
+            end_day=6,  # Saturday
+            start_time=self.time_9,
+            end_time=self.time_11,
         )
 
         self.assertTrue(trading_time.within_range(test_time))
@@ -64,11 +67,11 @@ class MarketTestCase(TestCase):
         # Set test time Monday, 28 November, 2022, 13:00:00
         test_time = datetime(2022, 11, 28, 13, 0, 0)
         trading_time = TradingTime.objects.create(
-            user = self.user,
-            start_day = 1,
-            end_day = 6,
-            start_time = self.time_14,
-            end_time = self.time_16,
+            user=self.user,
+            start_day=1,
+            end_day=6,
+            start_time=self.time_14,
+            end_time=self.time_16,
         )
 
         self.assertFalse(trading_time.within_range(test_time))
@@ -80,11 +83,11 @@ class MarketTestCase(TestCase):
         test_time = datetime(2022, 11, 29, 8, 0, 0)
 
         trading_time = TradingTime.objects.create(
-            user = self.user,
-            start_day = 2, # Tuesday
-            end_day = 6,
-            start_time = self.time_9,
-            end_time = self.time_11,
+            user=self.user,
+            start_day=2,  # Tuesday
+            end_day=6,
+            start_time=self.time_9,
+            end_time=self.time_11,
         )
 
-        self.assertFalse(trading_time.within_range(test_time))
\ No newline at end of file
+        self.assertFalse(trading_time.within_range(test_time))