Perform f-string updates using py-upgrade

private_storage/models.py

@@ -16,7 +16,7 @@ class PrivateFile:
         self.parent_object = parent_object
 
     def __repr__(self):
-        return '<PrivateFile: {}>'.format(self.relative_name)
+        return f'<PrivateFile: {self.relative_name}>'
 
     @cached_property
     def full_path(self):

private_storage/servers.py

@@ -16,7 +16,7 @@ from django.utils.module_loading import import_string
 from django.views.static import serve, was_modified_since
 
 
-@lru_cache()
+@lru_cache
 def get_server_class(path):
     if '.' in path:
         return import_string(path)

private_storage/views.py

@@ -126,17 +126,17 @@ class PrivateStorageView(View):
         if 'WebKit' in user_agent:
             # Support available for UTF-8 encoded strings.
             # This also matches Edgee.
-            return 'filename={}'.format(filename).encode("utf-8")
+            return f'filename={filename}'.encode("utf-8")
         elif 'MSIE' in user_agent:
             # IE does not support RFC2231 for internationalized headers, but somehow
             # percent-decodes it so this can be used instead. Note that using the word
             # "attachment" anywhere in the filename overrides an inline content-disposition.
             url_encoded = quote(filename.encode("utf-8")).replace('attachment', "a%74tachment")
-            return "filename={}".format(url_encoded).encode("utf-8")
+            return f"filename={url_encoded}".encode("utf-8")
         else:
             # For others like Firefox, we follow RFC2231 (encoding extension in HTTP headers).
             rfc2231_filename = quote(filename.encode("utf-8"))
-            return "filename*=UTF-8''{}".format(rfc2231_filename).encode("utf-8")
+            return f"filename*=UTF-8''{rfc2231_filename}".encode("utf-8")
 
 
 class PrivateStorageDetailView(SingleObjectMixin, PrivateStorageView):