[MacPorts] #36178: Add port select support for pip and virtualenv

[MacPorts]

#36178: Add port select support for pip and virtualenv
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  Reporter:  Deil.Christoph@…       |      Owner:  akitada@…
      Type:  request                |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.1.2
Resolution:                         |   Keywords:  select, pip, virtualenv
      Port:  py-pip, py-virtualenv  |
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Comment (by phildobbin@…):

 I too would like to add my support for this feature.

 I've just installed `virtualenv_select` under the impression it would
 fulfil this function but every which way I attempt to use it I get:

 `Selecting 'virtualenv-2.7' for 'virtualenv' failed: The specified version
 'virtualenv-2.7' is not valid`

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Ticket URL: <https://trac.macports.org/ticket/36178#comment:3>
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