[MacPorts] #52995: py-pygraphviz: add suports for python 3

[MacPorts]

#52995: py-pygraphviz: add suports for python 3
--------------------+---------------------------
 Reporter:  mojca   |      Owner:
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  py-pygraphviz
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 Not sure what type of ticket this is, but following
 [https://github.com/macports/macports-ports/pull/76 PR #76] I tried to add
 subports for python 3.4 and 3.5 to `py-pygraphviz` and failed.

 I tested versions 1.1, 1.3, 1.4rc1. I suspect that 1.1 is not compatible,
 1.3 is most likely missing a file, 1.4rc1 fails with
 {{{
 running install
 dpkg-query: no path found matching pattern *graphviz*
 Trying dpkg
 Traceback (most recent call last):
   File "setup.py", line 93, in <module>
     tests_require=['nose>=0.10.1', 'doctest-ignore-unicode>=0.1.0',
 'mock>=1.3'],
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/distutils/core.py",
 line 148, in setup
     dist.run_commands()
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/distutils/dist.py",
 line 955, in run_commands
     self.run_command(cmd)
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/distutils/dist.py",
 line 974, in run_command
     cmd_obj.run()
   File
 "/path/to/py35-pygraphviz/work/pygraphviz-1.4rc1/setup_commands.py", line
 44, in modified_run
     self.include_path, self.library_path = get_graphviz_dirs()
   File "/path/to/py35-pygraphviz/work/pygraphviz-1.4rc1/setup_extra.py",
 line 156, in get_graphviz_dirs
     include_dirs, library_dirs = _try_configure(include_dirs,
 library_dirs, _dpkg_config)
   File "/path/to/py35-pygraphviz/work/pygraphviz-1.4rc1/setup_extra.py",
 line 115, in _try_configure
     i, l = try_function()
   File "/path/to/py35-pygraphviz/work/pygraphviz-1.4rc1/setup_extra.py",
 line 47, in _dpkg_config
     output = S.check_output(['dpkg', '-S', 'graphviz'])
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py",
 line 626, in check_output
     **kwargs).stdout
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py",
 line 708, in run
     output=stdout, stderr=stderr)
 subprocess.CalledProcessError: Command '['dpkg', '-S', 'graphviz']'
 returned non-zero exit status 1
 Command failed:  cd "/path/to/py35-pygraphviz/work/pygraphviz-1.4rc1" &&
 /opt/local/Library/Frameworks/Python.framework/Versions/3.5/bin/python3.5
 setup.py --no-user-cfg install
 --prefix=/opt/local/Library/Frameworks/Python.framework/Versions/3.5
 --root=/path/to/py35-pygraphviz/work/destroot
 Exit code: 1
 }}}

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Ticket URL: <https://trac.macports.org/ticket/52995>
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