Fix type hints

docs/source/conf.py

@@ -132,6 +132,7 @@ extensions = {
     'sphinx.ext.autodoc',
     'sphinx.ext.intersphinx',
     'sphinx.ext.viewcode',
+    'sphinx.ext.napoleon',
     'sphinx_rtd_theme',
     'sphinx.ext.graphviz',
     'sphinx.ext.inheritance_diagram',
@@ -205,3 +206,5 @@ set_type_checking_flag = True
 typehints_fully_qualified = True
 always_document_param_types = True
 typehints_document_rtype = True
+
+napoleon_attr_annotations = True