[MacPorts] #60175: cannot import name '_tkagg' from 'matplotlib.backends' in python 2.7 and python 3.8

[MacPorts]

#60175: cannot import name '_tkagg' from 'matplotlib.backends' in python 2.7 and
python 3.8
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  Reporter:  lpagani91        |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.6.2
Resolution:                   |   Keywords:  python libraries
      Port:  pyxx-matplotlib  |
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Comment (by mf2k):

 In the future, please use WikiFormatting and add the port maintainer(s) to
 Cc ({{{port info --maintainers py38-matplotlib}}}), if any.

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Ticket URL: <https://trac.macports.org/ticket/60175#comment:1>
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