[MacPorts] #65884: dependency related commands don't seem to work

[MacPorts]

#65884: dependency related commands don't seem to work
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  Reporter:  lukaso  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.7.2
Resolution:          |   Keywords:  dependency
      Port:          |
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Comment (by jmroot):

 `port dependents` considers only the (runtime) dependency information
 recorded in the registry. If it shows nothing for python38, it's safe to
 uninstall it. If something you have installed depended on python38 at
 build time, `port installed depends:python38` or `port installed
 variant:python38 | grep python38` may help to find it.

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Ticket URL: <https://trac.macports.org/ticket/65884#comment:2>
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