diff --git a/jedi/_compatibility.py b/jedi/_compatibility.py
index f6c1422f..9aa35620 100644
--- a/jedi/_compatibility.py
+++ b/jedi/_compatibility.py
@@ -98,7 +98,10 @@ class ZipFileIO(KnownContentFileIO):
         self._zip_path = zip_path
 
     def get_last_modified(self):
-        return os.path.getmtime(self._zip_path)
+        try:
+            return os.path.getmtime(self._zip_path)
+        except OSError:  # Python 3 would probably only need FileNotFoundError
+            return None
 
 
 def _from_loader(loader, string):
diff --git a/jedi/evaluate/names.py b/jedi/evaluate/names.py
index 555ed0b0..23d7d79f 100644
--- a/jedi/evaluate/names.py
+++ b/jedi/evaluate/names.py
@@ -122,6 +122,7 @@ class TreeNameDefinition(AbstractTreeName):
 
 
 class ParamNameInterface(object):
+    # annotation default?!
     def get_kind(self):
         raise NotImplementedError