--- a/hgext/show.py	Tue Apr 04 16:49:12 2017 +0200
+++ b/hgext/show.py	Wed Apr 05 00:34:58 2017 +0900
@@ -19,6 +19,7 @@
     cmdutil,
     commands,
     error,
+    pycompat,
     registrar,
 )
 
@@ -133,5 +134,5 @@
 # TODO make this more robust.
 longest = max(map(len, showview._table.keys()))
 for key in sorted(showview._table.keys()):
-    cmdtable['show'][0].__doc__ += ' %s   %s\n' % (
-        key.ljust(longest), showview._table[key]._origdoc)
+    cmdtable['show'][0].__doc__ += pycompat.sysstr(' %s   %s\n' % (
+        key.ljust(longest), showview._table[key]._origdoc))