old_contents: from __future__ import absolute_import
  from . import pmag
  from . import ipmag
  from . import pmagplotlib
  from . import find_pmag_dir
  from . import version
  from . import controlled_vocabularies2 as controlled_vocabularies
  from . import data_model3
  from . import new_builder
  from . import mapping
  #import set_env
  
  __all__ = [pmag, ipmag, pmagplotlib, find_pmag_dir, version,
             controlled_vocabularies, data_model3, new_builder,
             mapping]
  
new_contents: from __future__ import absolute_import
  import sys
  if sys.version_info <= (3,):
      raise Exception("""
  You are running Python {}.
  This version of pmagpy is only compatible with Python 3.
  Make sure you have pip >= 9.0 to avoid this kind of issue,
  as well as setuptools >= 24.2:
  
   $ pip install pip setuptools --upgrade
  
  Then you should be able to download the correct version of pmagpy:
  
   $ pip install pmagpy --upgrade
  
  If this still gives you an error, please report the issue:
  https://github.com/PmagPy/PmagPy/issues
  
  Thanks!
  
  """.format(sys.version))
  from . import pmag
  from . import ipmag
  from . import pmagplotlib
  from . import find_pmag_dir
  from . import version
  from . import controlled_vocabularies2 as controlled_vocabularies
  from . import data_model3
  from . import new_builder
  from . import mapping
  #import set_env
  
  __all__ = [pmag, ipmag, pmagplotlib, find_pmag_dir, version,
             controlled_vocabularies, data_model3, new_builder,
             mapping]
  
subject: Add Exception on import of pmagpy if using wrong Python version (should be impossible to install this version, but people are tricky….)