[MacPorts] #64662: matplotlib installation generating a circular import error

[MacPorts]

#64662: matplotlib installation generating a circular import error
-----------------------------+------------------------------
 Reporter:  mmaclow          |      Owner:  (none)
     Type:  defect           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.7.1
 Keywords:  monterey x86_64  |       Port:  py310-matplotlib
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 py310 @3.5.1_0+cairo+webagg generates circular import error on import

 I have a fresh installation of MacPorts (built yesterday) on a newly
 upgraded version of MacOS Monterey on an x86 MacBook Pro, with the current
 version of Xcode.  I have installed python310, py310-numpy, and so forth,
 including py310-matplotlib.  Everything works, with no errors generated
 during install.  However when I try to import matplotlib into a jupyter
 notebook, I get the error message:

 {{{ImportError: cannot import name '_c_internal_utils' from partially
 initialized module 'matplotlib' (most likely due to a circular import)
 (/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9
 /site-packages/matplotlib/__init__.py) }}}

 I have tried uninstalling and cleaning the port py310-matplotlib, and then
 reinstalling it, without improvement.

 I don't know why it is showing up in the python3.9/site-packages rather
 than python3.10/site-packages, but I'm not sure whether that is the
 problem here.

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Ticket URL: <https://trac.macports.org/ticket/64662>
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