[MacPorts] #42747: "port python --select" should offer "python3" and "python2" options

[MacPorts]

#42747: "port python --select" should offer "python3" and "python2" options
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 Reporter:  nad@…        |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.2.1
 Keywords:               |       Port:  python_select
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 As documented in Python PEP 394
 (http://legacy.python.org/dev/peps/pep-0394/), it is problematic and not
 currently recommended to use "python" as a synonym for a Python 3 version.
 Recommended upstream practice is to offer "python3' as a synonym for the
 current preferred Python 3 version, "python2" for the current preferred
 Python 2 version, and, during the long transition period from Python 2 to
 Python 3, recommend "python" be the same as "python2" but eventually
 moving to "python3".  In support of this, "port select --python" should
 support "python3" and "python2" groups.

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Ticket URL: <https://trac.macports.org/ticket/42747>
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