consider importability in exit code

echo "===================== importability ====================="

echo " > try 'from $JOB_NAME.top_level_interface import *'"

python -c "from $JOB_NAME.top_level_interface import *"

if [ "$?" != 0 ]; then

import_status=$?

  echo "Failed!"

if [ "$import_status" != 0 ]; then

  echo "Import failed!"

else

  echo "Done!"

  echo "Import done!"

fi

# the exit value is determined from unit tests