[MacPorts] #57767: py36-graph-tool uses incorrect python version 2.7

[MacPorts]

#57767: py36-graph-tool uses incorrect python version 2.7
----------------------------+----------------------
  Reporter:  ssllmit        |      Owner:  count0
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.5.4
Resolution:                 |   Keywords:
      Port:  py-graph-tool  |
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Comment (by jmroot):

 You seem to have a couple of misconceptions. First: `port select --set
 python python36` does one thing only: it installs a `python` link that
 points to `python3.6`. It does not affect the dependencies of any port.

 Second: boost sets its own dependencies, they are not chosen by py-graph-
 tool. It happens that boost defaults to +python27.

 There's no evidence here that py36-graph-tool is itself using the wrong
 python version.

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Ticket URL: <https://trac.macports.org/ticket/57767#comment:3>
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