[MacPorts] #59894: boost: switch to Python 3 as default variant since Python 2 will not be maintained past Jan. 1st, 2020

[MacPorts]

#59894: boost: switch to Python 3 as default variant since Python 2 will not be
maintained past Jan. 1st, 2020
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 Reporter:  kuanyili  |      Owner:  ryandesign
     Type:  update    |     Status:  assigned
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  boost
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 https://www.python.org/doc/sunset-python-2/

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Ticket URL: <https://trac.macports.org/ticket/59894>
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