Chris Jerdonek added the comment:
Updating the patch again to tweak the original documentation change.
I was concerned that the previous language could be construed to mean that Popen will look in *two* places for the executable (both relative to the current directory and relative to the cwd argument). The change I'm uploading makes this a little more clear.
---------- Added file: http://bugs.python.org/file27116/issue-15533-6-default.patch