[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
----------------------------+------------------------
  Reporter:  lpagani91      |      Owner:  reneeotten
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.2
Resolution:                 |   Keywords:
      Port:  py-matplotlib  |
----------------------------+------------------------
Changes (by mf2k):

 * keywords:  python libraries =>
 * status:  new => assigned
 * port:  pyxx-matplotlib => py-matplotlib
 * owner:  (none) => reneeotten


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Ticket URL: <https://trac.macports.org/ticket/60175#comment:2>
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