# HG changeset patch
# User Martin Geisler <mg@lazybytes.net>
# Date 2009-05-20 08:50:23
# Node ID 22ec9cf4d0ceade8b1d511d8ff57307861a6bbf4
# Parent  6062c6362b2e318fbc731d3aa1211b662d70c191

util: use "is" for True/False/None comparisons

diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -522,9 +522,9 @@ def system(cmd, environ={}, cwd=None, on
     exception.'''
     def py2shell(val):
         'convert python object into string that is useful to shell'
-        if val in (None, False):
+        if val is None or val is False:
             return '0'
-        if val == True:
+        if val is True:
             return '1'
         return str(val)
     oldenv = {}