[MacPorts] #67055: python portgroup overwrites PYTHONPATH in test.env

[MacPorts]

#67055: python portgroup overwrites PYTHONPATH in test.env
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  Reporter:  dgilman  |      Owner:  reneeotten
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:           |
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Comment (by jmroot):

 Replying to [comment:4 dgilman]:
 > A portfile with only `python.test_framework pytest` and `test.run yes`
 also emits an empty PYTHONPATH

 That at least is expected, since it gets the value by globbing in
 $worksrcpath, so if that's empty, so will be the glob result. At minimum
 it probably makes sense to not set the environment variable if the glob
 doesn't match anything.

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Ticket URL: <https://trac.macports.org/ticket/67055#comment:6>
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