[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
Resolution:                    |   Keywords:  monterey x86_64
      Port:  py310-matplotlib  |
-------------------------------+-----------------------------
Description changed by mmaclow:

Old description:

> 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.

New description:

 py310-matplotlib @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#comment:1>
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