[MacPorts] #53022: opencv @3.1.0_6+python34: Portfile broken for variant +python34

[MacPorts]

#53022: opencv @3.1.0_6+python34: Portfile broken for variant +python34
---------------------+--------------------
 Reporter:  detlevd  |      Owner:
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.3.4
 Keywords:           |       Port:  opencv
---------------------+--------------------
 On macOS 10.11 I installed opencv +python34, but the portfile causes
 python35 and friends to be installed (alltough for py34 everything is
 there):

 {{{
 me at mymac> sudo port install opencv +python34
 --->  Computing dependencies for opencv
 --->  Dependencies to be installed: py35-numpy py35-cython python35
 py35-nose py35-setuptools
   ...
 }}}

 Furthermore, the stuff is then installed in .../3.5/lib/python3.5/site-
 packages where my python 3.4 scripts don't find them.

 Compared to earlier versions of the Portfile (opencv @3.1.0_4+python34),
 instead of explicit variant descriptions, the current one (opencv
 @3.1.0_6+python34) contains some loop over python versions
 {{{
 set pythonversions {3.4 3.5}
 foreach pdv ${pythonversions} {
     set pv [join [lrange [split ${pdv} .] 0 1] ""]
     set conflist ""
     foreach v ${pythonversions} {
       ...
 }}}

 which apparently does not work as expected.

 Workaround: delete '3.5' from the 'pythonversions' list to get a working
 "+python34" variant.

--
Ticket URL: <https://trac.macports.org/ticket/53022>
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