[MacPorts] #57766: py-graph-tool uses incorrect (default) python version 2.7, propagates to dependencies

[MacPorts]

#57766: py-graph-tool uses incorrect (default) python version 2.7, propagates to
dependencies
----------------------------+--------------------
  Reporter:  ssllmit        |      Owner:  count0
      Type:  defect         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.5.4
Resolution:  invalid        |   Keywords:
      Port:  py-graph-tool  |
----------------------------+--------------------

Comment (by mamoll):

 @ss, I think what you want can be achieved by adding `+python36` to `
 /opt/local/etc/macports/variants.conf`.

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Ticket URL: <https://trac.macports.org/ticket/57766#comment:6>
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