Fix mypy violations

1 files changed, 12 insertions, 0 deletions

diff --git a/sphinx/addnodes.py b/sphinx/addnodes.py
index c410cb9b7..1cadb27e5 100644
--- a/sphinx/addnodes.py
+++ b/sphinx/addnodes.py
@@ -11,6 +11,10 @@
 
 from docutils import nodes
 
+if False:
+    # For type annotation
+    from typing import Sequence  # NOQA
+
 
 class translatable(object):
     """Node which supports translation.
@@ -27,14 +31,17 @@ class translatable(object):
     """
 
     def preserve_original_messages(self):
+        # type: () -> None
         """Preserve original translatable messages."""
         raise NotImplementedError
 
     def apply_translated_message(self, original_message, translated_message):
+        # type: (unicode, unicode) -> None
         """Apply translated message."""
         raise NotImplementedError
 
     def extract_original_messages(self):
+        # type: () -> Sequence[unicode]
         """Extract translation messages.
 
         :returns: list of extracted messages or messages generator
@@ -46,14 +53,17 @@ class toctree(nodes.General, nodes.Element, translatable):
     """Node for inserting a "TOC tree"."""
 
     def preserve_original_messages(self):
+        # type: () -> None
         if self.get('caption'):
             self['rawcaption'] = self['caption']
 
     def apply_translated_message(self, original_message, translated_message):
+        # type: (unicode, unicode) -> None
         if self.get('rawcaption') == original_message:
             self['caption'] = translated_message
 
     def extract_original_messages(self):
+        # type: () -> List[unicode]
         if 'rawcaption' in self:
             return [self['rawcaption']]
         else:
@@ -106,6 +116,7 @@ class desc_type(nodes.Part, nodes.Inline, nodes.TextElement):
 class desc_returns(desc_type):
     """Node for a "returns" annotation (a la -> in Python)."""
     def astext(self):
+        # type: () -> unicode
         return ' -> ' + nodes.TextElement.astext(self)
 
 
@@ -127,6 +138,7 @@ class desc_optional(nodes.Part, nodes.Inline, nodes.TextElement):
     child_text_separator = ', '
 
     def astext(self):
+        # type: () -> unicode
         return '[' + nodes.TextElement.astext(self) + ']'