Fixed #25221 -- Prevented django_bash_completion from leaking variables into the environment.

extras/django_bash_completion

@@ -42,10 +42,10 @@ complete -F _django_completion -o default django-admin.py manage.py django-admin
 _python_django_completion()
 {
     if [[ ${COMP_CWORD} -ge 2 ]]; then
-        PYTHON_EXE=${COMP_WORDS[0]##*/}
+        local PYTHON_EXE=${COMP_WORDS[0]##*/}
         echo $PYTHON_EXE | egrep "python([2-9]\.[0-9])?" >/dev/null 2>&1
         if [[ $? == 0 ]]; then
-            PYTHON_SCRIPT=${COMP_WORDS[1]##*/}
+            local PYTHON_SCRIPT=${COMP_WORDS[1]##*/}
             echo $PYTHON_SCRIPT | egrep "manage\.py|django-admin(\.py)?" >/dev/null 2>&1
             if [[ $? == 0 ]]; then
                 COMPREPLY=( $( COMP_WORDS="${COMP_WORDS[*]:1}" \
@@ -63,9 +63,11 @@ if command -v whereis &>/dev/null; then
     for python in $python_interpreters; do
         pythons="${pythons} ${python##*/}"
     done
+    unset python_interpreters
     pythons=$(echo $pythons | tr " " "\n" | sort -u | tr "\n" " ")
 else
     pythons=python
 fi
 
 complete -F _python_django_completion -o default $pythons
+unset pythons