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Fixing sys.executable to point to the stub launcher instead of the interpreter in the fw will also fix other unrelated issues, like making python3-32 work properly in 64-/32-bit builds for IDLE and for tests that spawn interpreters in subprocesses. Today, while the main process is 32-bit, the interpreters in subprocesses are 64-bit.
I did a little clean up and fixed up the documentation somewhat; see the revised patch. But building a stock installer and running the tests showed two issues:
1) test_osx_env fails at line 28, checking PYTHONEXECUTABLE
2) when running the tests within a venv, test_venv now fails at line 95;
sys.baseprefix != sys.prefix. This did not fail previously
Also, I saw another test failure when building and running with a test framework environment that included a relative link. It appeared that _NSGetExecutablePath in pythonw.c returned an unnormalized path:
>>> sys.executable
'/py/dev/default/b10.7_t10.7_x4.3_cclang_d/fw/./root/bin/python3.3'
which caused a test_venv failure. I probably won't have time to look at this again for a few days.