patch 8.0.0251: not easy to select Python 2 or 3

Problem: It is not so easy to write a script that works with both Python 2
and Python 3, even when the Python code works with both.
So

patch 8.0.0251: not easy to select Python 2 or 3

Problem: It is not so easy to write a script that works with both Python 2
and Python 3, even when the Python code works with both.
Solution: Add 'pyxversion', :pyx, etc. (Marc Weber, Ken Takata)

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