[MacPorts] #62265: py-astunparse: @1.6.3: test failures for new Python 3.9 subport

[MacPorts]

#62265: py-astunparse: @1.6.3: test failures for new Python 3.9 subport
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 Reporter:  mascguy  |      Owner:  cjones051073
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  py-astunparse
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 While new subport `py39-astunparse` builds successfully, numerous tests
 fail.

 Of note, tests succeed for subports < 3.9, suggesting that 3.9
 compatibility isn't quite there yet. That was also supported by my
 research into Python 3.9 compatibility for ports such as `py-astunparse`,
 among other key dependencies for `py-tensorflow`, two weeks ago.

 If the Python 3.9 subport is intended to be a placeholder, with the caveat
 that it may not be fully functional yet, that's fine. (With the caveat
 that a port note, succinctly stating that, probably should be added.)

 However, if the hope was to provide a 100% functional subport -
 particularly to support tensorflow - I'm not sure that we're there yet.
 (Important note: Our port for `py-astunparse` is already using the latest
 released version - 1.6.3 - so we can't upgrade it at the present time.)

 Logs attached for two test runs:
 * Tests for `py38-astunparse`, which succeed.
 * Tests for `py39-astunparse`, which fail.

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Ticket URL: <https://trac.macports.org/ticket/62265>
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