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if [ -z "${PYTHON2-}" ]; then
which python2.7 >/dev/null 2>&1 && PYTHON2=$(which python2.7)
which python2 >/dev/null 2>&1 && PYTHON2=$(which python2)
fi
if [ -z "${PYTHON3-}" ]; then
which python3.4 >/dev/null 2>&1 && PYTHON3=$(which python3.4)
which python3.5 >/dev/null 2>&1 && PYTHON3=$(which python3.5)
which python3.6 >/dev/null 2>&1 && PYTHON3=$(which python3.6)
which python3 >/dev/null 2>&1 && PYTHON3=$(which python3)
fi
if [ -z "${PYTHON-}" ]; then
which python >/dev/null 2>&1 && PYTHON=$(which python)
if [ $VER -eq 2 -a -n "${PYTHON2}" ]; then
PYTHON=${PYTHON2}
elif [ $VER -eq 3 -a -n "${PYTHON3}" ]; then
PYTHON=${PYTHON3}