[Bug 209551] Python bits ignore DEFAULT_VERSIONS

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209551

Iblis Lin <iblis at hs.ntnu.edu.tw> changed:

           What    |Removed                     |Added
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                 CC|                            |iblis at hs.ntnu.edu.tw

--- Comment #1 from Iblis Lin <iblis at hs.ntnu.edu.tw> ---
Hi,

I will propose that reordering priorities of those variables --
${LOCALBASE}/bin/python and DEFAULT_VERSION.

The state quo:
    if ${LOCALBASE}/bin/python exists:
        priority: PYTHON_VERSION > ${LOCALBASE}/bin/python > DEFAULT_VERSIONS
    else:
        priority: PYTHON_VERSION > DEFAULT_VERSIONS

I think make `DEFAULT_VERSIONS` override `${LOCALBASE}/bin/python` will be
better:
    priority: PYTHON_VERSION > DEFAULT_VERSIONS > ${LOCALBASE}/bin/python


The PYTHON_VERSION still has the highest priority. This variable is handy for
installing same ports with different python version at the same time.
For example, I need the `database/py-sqlite3` installed for both py27 and py35.
I just simply issue make with `PYTHON_VERSION`:
    make install clean PYTHON_VERSION=2.7 && make install clean
PYTHON_VERSION=3.5

So, preserving the flexibility to override default is necessary; PYTHON_VERSION
do it well currently. We just need to switch the order of 'local python' and
DEFAULT_VERSION.

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