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

[MacPorts]

#42747: "port python --select" should offer "python3" and "python2" options
----------------------------+--------------------------------
  Reporter:  nad@…          |      Owner:  macports-tickets@…
      Type:  enhancement    |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.2.1
Resolution:                 |   Keywords:
      Port:  python_select  |
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Comment (by J.Gilbey@…):

 Yes, I just got bitten by this one too: there are python programs written
 in Python 3.x which begin with #! /usr/bin/env python3, which won't run
 under macports because there's no python3 symlink :-(

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Ticket URL: <https://trac.macports.org/ticket/42747#comment:2>
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