ShotGrid Desktop - default to python3?

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Actually I found something in the release notes for SG Desktop.

Specifically:

V1.6.1
What is new?

You can choose which version of Python to run Shotgun Desktop under. When running the Advanced Project Setup in Python 3 mode, projects will be configured to use the built-in Python 3 interpreter. Note that once setup, a project configured with Python 3 can still be used by a user running a Python 2 version of Shotgun Desktop and vice-versa.

To select which version of Python to use on startup, set the SHOTGUN_PYTHON_VERSION environment variable to 2 or 3 .

So it seems like something is set after the advanced project wizard to launch a project in python 3 mode.