[MacPorts] #57927: waf PortGroup: make the python version configurable

[MacPorts]

#57927: waf PortGroup: make the python version configurable
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  Reporter:  yan12125     |      Owner:  Ionic
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  mpv          |
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Comment (by ryandesign):

 Rainer, it isn't configurable. That is, a maintainer could certainly
 change the value of waf.python in their portfile but that would have no
 effect on the configure.cmd and build.cmd that the portgroup already sets
 (the portgroup would need to use ''defaults'' for configure.cmd and
 build.cmd instead), and as you say the python dependency is not handled in
 a configurable way either. I'll see what I can do to improve the
 situation. I'll try to introduce a python version variable.

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Ticket URL: <https://trac.macports.org/ticket/57927#comment:5>
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