MAINT make copy_joblib.sh Python 3 compatible

Author: lesteve

sklearn/externals/copy_joblib.sh

@@ -1,19 +1,22 @@
 #!/bin/sh
 # Script to do a local install of joblib
 rm -rf tmp joblib
-mkdir -p tmp/lib/python2.7/site-packages
-ln -s tmp/lib/python2.7 tmp/lib/python2.6
+PYTHON_VERSION=$(python -c 'import sys; print("{0[0]}.{0[1]}".format(sys.version_info))')
+SITE_PACKAGES="$PWD/tmp/lib/python$PYTHON_VERSION/site-packages"
+
+mkdir -p $SITE_PACKAGES
 mkdir -p tmp/bin
-export PYTHONPATH=$(pwd)/tmp/lib/python2.7/site-packages:$(pwd)/tmp/lib/python2.6/site-packages
+export PYTHONPATH="$SITE_PACKAGES"
 easy_install -Zeab tmp joblib
-old_pwd=$(pwd)
-#cd /home/varoquau/dev/joblib/
+
 cd tmp/joblib/
-python setup.py install --prefix $old_pwd/tmp
-cd $old_pwd
-cp -r tmp/lib/python2.7/site-packages/joblib-*.egg/joblib .
+python setup.py install --prefix $OLDPWD/tmp
+cd $OLDPWD
+cp -r $SITE_PACKAGES/joblib-*.egg/joblib .
 rm -rf tmp
 # Needed to rewrite the doctests
+# Note: BSD sed -i needs an argument unders OSX
+# so first renaming to .bak and then deleting backup files
 find joblib -name "*.py" | xargs sed -i.bak "s/from joblib/from sklearn.externals.joblib/"
 find joblib -name "*.bak" | xargs rm