diff -r 4cd9d0a9f42f -r df1e3b67882a VirtualMailManager/transport.py
--- a/VirtualMailManager/transport.py	Sun Nov 11 16:53:52 2012 +0000
+++ b/VirtualMailManager/transport.py	Tue Nov 20 13:40:32 2012 +0000
@@ -32,10 +32,10 @@
         self._tid = 0
         assert any((tid, transport))
         if tid:
-            assert not isinstance(tid, bool) and isinstance(tid, (int, long))
+            assert not isinstance(tid, bool) and isinstance(tid, int)
             self._load_by_id(tid)
         else:
-            assert isinstance(transport, basestring)
+            assert isinstance(transport, str)
             self._transport = transport
             self._load_by_name()