[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:  reneeotten
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.2
Resolution:                 |   Keywords:
      Port:  py-matplotlib  |
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Comment (by lpagani91):

 OK, I thought installing pyXY-tkinter was the thing to do.
 How could I know that I have to install matplotlib +tkinter instead ??
 The Agg typo is only in trials by hand. The code was correctly spelled Agg
 After installing with the +tkinter option, it works.
 Thanks, folks!

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Ticket URL: <https://trac.macports.org/ticket/60175#comment:5>
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