improved code style in conf.py

sphinx/conf.py

@@ -31,9 +31,11 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = ['sphinx.ext.autodoc',
+extensions = [
+    'sphinx.ext.autodoc',
     'sphinx.ext.intersphinx',
-    'sphinx.ext.todo']
+    'sphinx.ext.todo',
+]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['templates']