[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:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:  fixed        |   Keywords:
      Port:  boost        |
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Comment (by ryandesign):

 But now every port that used python27 because that was the default for
 boost will need to be updated to use python37.

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Ticket URL: <https://trac.macports.org/ticket/59894#comment:3>
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