[issue27602] Enable py launcher to launch repository Python.

[Zachary Ware]

Zachary Ware added the comment:

--register sounds interesting.  It could write to the user-specific py.ini, and would be useful for other things, like for `py --register pypy C:\pypy\pypy.exe`.  I've also thought it would be useful to be able to use py.exe directly to invoke interpreters configured in py.ini.

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