@@ -2380,13 +2380,28 @@ function is_provider_network {

 }

+# Return just the <major>.<minor> for the given python interpreter

+function _get_python_version {

+    local interp=$1

+    local version

+    version=$($interp -c 'import sys; print("%s.%s" % sys.version_info[0:2])')

+    echo ${version}

+}

+

 # Return the current python as "python<major>.<minor>"

 function python_version {

     local python_version

-    python_version=$(python -c 'import sys; print("%s.%s" % sys.version_info[0:2])')

+    python_version=$(_get_python_version python2)

+    echo "python${python_version}"

+}

+

+function python3_version {

+    local python3_version

+    python3_version=$(_get_python_version python3)

     echo "python${python_version}"

 }

+

 # Service wrapper to restart services

 # restart_service service-name

 function restart_service {

@@ -153,10 +153,12 @@ export DISABLED_PYTHON3_PACKAGES=""

 # When Python 3 is supported by an application, adding the specific

 # version of Python 3 to this variable will install the app using that

 # version of the interpreter instead of 2.7.

-export PYTHON3_VERSION=${PYTHON3_VERSION:-3.5}

+_DEFAULT_PYTHON3_VERSION="$(_get_python_version python3)"

+export PYTHON3_VERSION=${PYTHON3_VERSION:-${_DEFAULT_PYTHON3_VERSION}}

 # Just to be more explicit on the Python 2 version to use.

-export PYTHON2_VERSION=${PYTHON2_VERSION:-2.7}

+_DEFAULT_PYTHON2_VERSION="$(_get_python_version python2)"

+export PYTHON2_VERSION=${PYTHON2_VERSION:-${_DEFAULT_PYTHON2_VERSION}}

 # allow local overrides of env variables, including repo config

 if [[ -f $RC_DIR/localrc ]]; then