How to get the python.exe location programmatically?

This works in Linux & Windows:

Python 3.x

>>> import sys
>>> print(sys.executable)
C:\path\to\python.exe

Python 2.x

>>> import sys
>>> print sys.executable
/usr/bin/python

sys.executable is not reliable if working in an embedded python environment. My suggestions is to deduce it from

import os
os.__file__

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