speed ups

Less f strings needed for non-modified strings and one indentation speedup fixed.

rest_framework/authtoken/admin.py

@@ -12,6 +12,7 @@ User = get_user_model()
 
 class TokenChangeList(ChangeList):
     """Map to matching User id"""
+
     def url_for_result(self, result):
         pk = result.user.pk
         return reverse(f'admin:{self.opts.app_label}_{self.opts.model_name}_change',

rest_framework/filters.py

@@ -296,7 +296,7 @@ class OrderingFilter(BaseFilterBackend):
         for key, label in self.get_valid_fields(queryset, view, context):
             options.append((key, f'{label} - {_("ascending")}'))
             options.append(('-' + key, f'{label} - {_("descending")}'))
-            context['options'] = options
+        context['options'] = options
         return context
 
     def to_html(self, request, queryset, view):

rest_framework/relations.py

@@ -411,9 +411,9 @@ class HyperlinkedRelatedField(RelatedField):
             if value in ('', None):
                 value_string = {'': 'the empty string', None: 'None'}[value]
                 msg += (
-                        f" WARNING: The value of the field on the model instance "
+                        " WARNING: The value of the field on the model instance "
                         f"was {value_string}, which may be why it didn't match any "
-                        f"entries in your URL conf."
+                        "entries in your URL conf."
                 )
             raise ImproperlyConfigured(msg % self.view_name)
 

rest_framework/serializers.py

@@ -1114,7 +1114,7 @@ class ModelSerializer(Serializer):
             )
 
         assert not (fields and exclude), (
-            f"Cannot set both 'fields' and 'exclude' options on "
+            "Cannot set both 'fields' and 'exclude' options on "
             f"serializer {self.__class__.__name__}."
         )