[MacPorts] #51572: port selecting python3 as python should emit a warning

[MacPorts]

#51572: port selecting python3 as python should emit a warning
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 Reporter:  jeremyhu@…   |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:  2.3.4
 Keywords:               |       Port:
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 Using any version of python 3 as the python interpreter is not supported.
 python should only refer to python2.  If users want to try configuring
 their system in this unsupported manner, they should be warned by 'port
 select' when doing so.

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Ticket URL: <https://trac.macports.org/ticket/51572>
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