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Here is an updated patch. The changes I made are:
(1) Update code comments in _call_popen_and_assert().
(2) Fix test failure.
(3) Rename _call_popen_and_assert() to _assert_cwd() since it is a simpler
 name and the old name did not reflect that the method is specific to
 the test_cwd_* methods.
(4) Add _split_python_path() helper method so that we do not need to call
 os.path.realpath(sys.executable) in every method.
Andrew, you can make changes re: Tru64 (removing old code, etc). Thanks.