Index: lnt/__init__.py
===================================================================
--- lnt/__init__.py
+++ lnt/__init__.py
@@ -3,4 +3,11 @@
 __versioninfo__ = (0, 4, 2)
 __version__ = '.'.join(map(str, __versioninfo__)) + '.dev0'
 
-__all__ = []
+# lnt module is imported from the setup script before modules are installed so
+# modules might not be available.
+try:
+    from typing import Sequence
+except Exception:
+    pass
+
+__all__ = [] # type: Sequence[str]
Index: lnt/external/__init__.py
===================================================================
--- lnt/external/__init__.py
+++ lnt/external/__init__.py
@@ -1 +1,3 @@
-__all__ = []
+from typing import Sequence
+
+__all__ = [] # type: Sequence[str]
Index: lnt/server/__init__.py
===================================================================
--- lnt/server/__init__.py
+++ lnt/server/__init__.py
@@ -1 +1,3 @@
-__all__ = []
+from typing import Sequence
+
+__all__ = [] # type: Sequence[str]
Index: lnt/server/db/__init__.py
===================================================================
--- lnt/server/db/__init__.py
+++ lnt/server/db/__init__.py
@@ -1 +1,3 @@
-__all__ = []
+from typing import Sequence
+
+__all__ = [] # type: Sequence[str]
Index: lnt/server/db/rules/__init__.py
===================================================================
--- lnt/server/db/rules/__init__.py
+++ lnt/server/db/rules/__init__.py
@@ -1 +1,3 @@
-__all__ = []
+from typing import Sequence
+
+__all__ = [] # type: Sequence[str]
Index: lnt/server/reporting/__init__.py
===================================================================
--- lnt/server/reporting/__init__.py
+++ lnt/server/reporting/__init__.py
@@ -1 +1,3 @@
-__all__ = []
+from typing import Sequence
+
+__all__ = [] # type: Sequence[str]
Index: lnt/server/ui/__init__.py
===================================================================
--- lnt/server/ui/__init__.py
+++ lnt/server/ui/__init__.py
@@ -1 +1,3 @@
-__all__ = []
+from typing import Sequence
+
+__all__ = [] # type: Sequence[str]
Index: lnt/testing/util/__init__.py
===================================================================
--- lnt/testing/util/__init__.py
+++ lnt/testing/util/__init__.py
@@ -2,4 +2,6 @@
 Miscellaneous utilities for generating test data.
 """
 
-__all__ = []
+from typing import Sequence
+
+__all__ = [] # type: Sequence[str]
Index: lnt/util/__init__.py
===================================================================
--- lnt/util/__init__.py
+++ lnt/util/__init__.py
@@ -1,5 +1,6 @@
 import logging
+from typing import Sequence
 
 logger = logging.getLogger("lnt.server.ui.app")
 
-__all__ = []
+__all__ = [] # type: Sequence[str]