1 files changed, 18 insertions, 16 deletions
diff --git a/doc/development/tutorials/examples/todo.py b/doc/development/tutorials/examples/todo.py
index 15368f4..2baac5c 100644
--- a/doc/development/tutorials/examples/todo.py
+++ b/doc/development/tutorials/examples/todo.py
@@ -1,8 +1,10 @@
 from docutils import nodes
 from docutils.parsers.rst import Directive
 
+from sphinx.application import Sphinx
 from sphinx.locale import _
 from sphinx.util.docutils import SphinxDirective
+from sphinx.util.typing import ExtensionMetadata
 
 
 class todo(nodes.Admonition, nodes.Element):
@@ -22,13 +24,11 @@ def depart_todo_node(self, node):
 
 
 class TodolistDirective(Directive):
-
     def run(self):
         return [todolist('')]
 
 
 class TodoDirective(SphinxDirective):
-
     # this enables content in the directive
     has_content = True
 
@@ -57,8 +57,7 @@ def purge_todos(app, env, docname):
     if not hasattr(env, 'todo_all_todos'):
         return
 
-    env.todo_all_todos = [todo for todo in env.todo_all_todos
-                          if todo['docname'] != docname]
+    env.todo_all_todos = [todo for todo in env.todo_all_todos if todo['docname'] != docname]
 
 
 def merge_todos(app, env, docnames, other):
@@ -90,37 +89,40 @@ def process_todo_nodes(app, doctree, fromdocname):
         for todo_info in env.todo_all_todos:
             para = nodes.paragraph()
             filename = env.doc2path(todo_info['docname'], base=None)
-            description = (
-                _('(The original entry is located in %s, line %d and can be found ') %
-                (filename, todo_info['lineno']))
+            description = _(
+                '(The original entry is located in %s, line %d and can be found '
+            ) % (filename, todo_info['lineno'])
             para += nodes.Text(description)
 
             # Create a reference
             newnode = nodes.reference('', '')
             innernode = nodes.emphasis(_('here'), _('here'))
             newnode['refdocname'] = todo_info['docname']
-            newnode['refuri'] = app.builder.get_relative_uri(
-                fromdocname, todo_info['docname'])
+            newnode['refuri'] = app.builder.get_relative_uri(fromdocname, todo_info['docname'])
             newnode['refuri'] += '#' + todo_info['target']['refid']
             newnode.append(innernode)
             para += newnode
             para += nodes.Text('.)')
 
             # Insert into the todolist
-            content.append(todo_info['todo'])
-            content.append(para)
+            content.extend((
+                todo_info['todo'],
+                para,
+            ))
 
         node.replace_self(content)
 
 
-def setup(app):
+def setup(app: Sphinx) -> ExtensionMetadata:
     app.add_config_value('todo_include_todos', False, 'html')
 
     app.add_node(todolist)
-    app.add_node(todo,
-                 html=(visit_todo_node, depart_todo_node),
-                 latex=(visit_todo_node, depart_todo_node),
-                 text=(visit_todo_node, depart_todo_node))
+    app.add_node(
+        todo,
+        html=(visit_todo_node, depart_todo_node),
+        latex=(visit_todo_node, depart_todo_node),
+        text=(visit_todo_node, depart_todo_node),
+    )
 
     app.add_directive('todo', TodoDirective)
     app.add_directive('todolist', TodolistDirective)