Fix code style: remove trailing whitespace and unused imports

rest_framework/authtoken/models.py

@@ -29,7 +29,7 @@ class Token(models.Model):
     def save(self, *args, **kwargs):
         """
         Save the token instance.
-        
+
         If no key is provided, generates a cryptographically secure key.
         For existing tokens with cleared keys, regenerates the key.
         For new tokens, ensures they are inserted as new (not updated).
@@ -45,10 +45,10 @@ class Token(models.Model):
     def generate_key(cls):
         """
         Generate a cryptographically secure token key.
-        
+
         Uses secrets.token_hex(20) which provides 40 hexadecimal characters
         (160 bits of entropy) suitable for authentication tokens.
-        
+
         Returns:
             str: A 40-character hexadecimal string
         """

tests/test_authtoken.py

@@ -1,5 +1,4 @@
 import importlib
-import secrets
 from io import StringIO
 from unittest import mock
 
@@ -75,7 +74,7 @@ class AuthTokenTests(TestCase):
         """
         user2 = User.objects.create_user('user2', 'user2@example.com', 'p')
         existing_token = Token.objects.create(user=user2)
-        
+
         # Try to create another token with the same key
         with self.assertRaises(IntegrityError):
             Token.objects.create(key=existing_token.key, user=self.user)
@@ -90,11 +89,11 @@ class AuthTokenTests(TestCase):
         token = Token(user=self.user)
         token.key = ""  # Explicitly clear the key
         token.save()
-        
+
         # Verify the key was generated
         self.assertEqual(len(token.key), 40)
         self.assertEqual(token.user, self.user)
-        
+
         # Verify it's saved in the database
         token.refresh_from_db()
         self.assertEqual(len(token.key), 40)