[MacPorts] #56760: py-virtualenvwrapper: add Python 3.7 support

[MacPorts]

#56760: py-virtualenvwrapper: add Python 3.7 support
-----------------------------------+--------------------
  Reporter:  mohd-akram            |      Owner:  (none)
      Type:  enhancement           |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:
Resolution:                        |   Keywords:
      Port:  py-virtualenvwrapper  |
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Comment (by mf2k):

 The dependencies will all also need to get py37 ports.

 {{{
 $ port info --depends py36-virtualenvwrapper

 depends_lib: python36, py36-pbr, py36-setuptools, py36-stevedore,
 py36-virtualenv, py36-virtualenv-clone
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56760#comment:1>
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