[issue27602] Enable py launcher to launch repository Python.

[Eryk Sun]

Eryk Sun <eryksun at gmail.com> added the comment:

The narrow scope of this issue could be implemented by defining a scheme for local builds in the PythonCore key -- such as "X.Ys[-32]". The build process would create or update the "HKCU\Software\Python\PythonCore\X.Ys[-32]\InstallPath" key with the "ExecutablePath" and "WindowedExecutablePath" values. 

In PC/launcher.c, validate_version() would have to allow "s" after the major/minor version (e.g. "3s", "3.10s"), and locate_python() would have to ignore "s" when deciding to call get_configured_value(config_key) if no minor version is specified (e.g. for "3s", check PY_PYTHON3 and the "python3" value in py.ini).

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versions: +Python 3.10, Python 3.8, Python 3.9 -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27602>
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