diff -r 448ed4d3ee90 -r c939fdce0fde mercurial/demandimport.py
--- a/mercurial/demandimport.py	Fri May 05 10:08:36 2017 -0700
+++ b/mercurial/demandimport.py	Wed May 03 18:26:57 2017 -0700
@@ -297,6 +297,7 @@
     'distutils.msvc9compiler',
     '__builtin__',
     'builtins',
+    'urwid.command_map', # for pudb
     ]
 
 if _pypy: