[MacPorts] #59746: py36-pip: ModuleNotFoundError: No module named 'pip._internal'

[MacPorts]

#59746: py36-pip: ModuleNotFoundError: No module named 'pip._internal'
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  Reporter:  ParityError  |      Owner:  stromnov
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  py-pip       |
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Comment (by ParityError):

 No environment variables are set regarding `Python` at all. Why this is
 happening is definitely a mystery.

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Ticket URL: <https://trac.macports.org/ticket/59746#comment:3>
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