old_contents: from roipoly.roipoly import RoiPoly
  from roipoly.roipoly import roipoly  # compatibility for old versions
  
  __version__ = '0.1.0'
  
  
new_contents: from .roipoly import RoiPoly
  from .roipoly import roipoly  # compatibility for old versions
  
  __version__ = '0.1.0'
  
  
subject: make imports work for python 2.7