On my other system (one year old as well, without upgrades) I'm having problem 
with python.
I was getting an error:

dev-lang/python-2.7.10-r4:2.7 ("<dev-lang/python-2.7.10-r4:2.7" is blocking 
dev-lang/python-exec-2.4.4)

so I run:
emerge -u1 portage python:2.7 python:3.4 python-exec

and the installation did not finish:

>>> Installing (1 of 5) dev-lang/python-3.4.5::gentoo
>>> needed    obj /usr/lib64/libpython3.4.so.1.0
Traceback (most recent call last):
  File "/usr/lib/python-exec/python3.4/emerge", line 50, in <module>
    retval = emerge_main()
  File "/usr/lib64/python3.4/site-packages/_emerge/main.py", line 1174, in 
emerge_main
    return run_action(emerge_config)
  File "/usr/lib64/python3.4/site-packages/_emerge/actions.py", line 3231, in 
run_action
    emerge_config.args, spinner)
  File "/usr/lib64/python3.4/site-packages/_emerge/actions.py", line 501, in 
action_build
    retval = mergetask.merge()
  File "/usr/lib64/python3.4/site-packages/_emerge/Scheduler.py", line 1032, in 
merge
    rval = self._merge()
  File "/usr/lib64/python3.4/site-packages/_emerge/Scheduler.py", line 1434, in 
_merge
    self._main_loop()
  File "/usr/lib64/python3.4/site-packages/_emerge/Scheduler.py", line 1405, in 
_main_loop
    self._event_loop.iteration()
  File 
"/usr/lib64/python3.4/site-packages/portage/util/_eventloop/EventLoop.py", line 
270, in iteration
    if not x.callback(f, event, *x.args):
  File "/usr/lib64/python3.4/site-packages/portage/util/_async/PipeLogger.py", 
line 92, in _output_handler
    self.wait()
  File "/usr/lib64/python3.4/site-packages/_emerge/AsynchronousTask.py", line 
57, in wait
    self._wait_hook()
  File "/usr/lib64/python3.4/site-packages/_emerge/AsynchronousTask.py", line 
175, in _wait_hook
    self._exit_listener_stack.pop()(self)
  File "/usr/lib64/python3.4/site-packages/_emerge/SpawnProcess.py", line 174, 
in _pipe_logger_exit
    self.wait()
  File "/usr/lib64/python3.4/site-packages/_emerge/AsynchronousTask.py", line 
57, in wait
    self._wait_hook()
  File "/usr/lib64/python3.4/site-packages/_emerge/AsynchronousTask.py", line 
175, in _wait_hook
    self._exit_listener_stack.pop()(self)
  File "/usr/lib64/python3.4/site-packages/_emerge/EbuildMerge.py", line 58, in 
_merge_exit
    self.exit_hook(self)
  File "/usr/lib64/python3.4/site-packages/_emerge/EbuildBuild.py", line 437, 
in _install_exit
    self._unlock_builddir()
  File "/usr/lib64/python3.4/site-packages/_emerge/EbuildBuild.py", line 292, 
in _unlock_builddir
    portage.elog.elog_process(self.pkg.cpv, self.settings)
  File "/usr/lib64/python3.4/site-packages/portage/elog/__init__.py", line 176, 
in elog_process
    m.process(mysettings, str(key), mod_logentries, mod_fulllog)
  File "/usr/lib64/python3.4/site-packages/portage/elog/mod_mail.py", line 17, 
in process
    myfrom = myfrom.replace("${HOST}", socket.getfqdn())
  File "/usr/lib64/python3.4/socket.py", line 463, in getfqdn
    name = name.strip()
LookupError: unknown encoding: idna

--
Thelma


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