fix the white spacing

rest_framework/throttling.py

@@ -5,6 +5,7 @@ import time
 
 from django.core.cache import cache as default_cache
 from django.core.exceptions import ImproperlyConfigured
+
 from rest_framework.settings import api_settings
 from rest_framework.utils.throttling_duration_parser import (
     parse_quantity_and_unit

tests/test_throttling.py

@@ -468,7 +468,7 @@ class SimpleRateThrottleTests(TestCase):
     def test_parse_rate_returns_tuple_with_none_if_rate_not_provided(self):
         rate = SimpleRateThrottle().parse_rate(None)
         assert rate == (None, None)
-    
+
     def test_parse_quantity_and_unit_parses_correctly(self):
         result = parse_quantity_and_unit("5min")
         assert result == (5, 'min')