This fixes running tests in virtualenvs (or on distros) that no longer
have a symlink from python to python2 or python3.
Closes #7602
-#!/usr/bin/env python
+#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#***************************************************************************
# _ _ ____ _
-#!/usr/bin/env python
+#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Project ___| | | | _ \| |
-#!/usr/bin/env python
+#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Project ___| | | | _ \| |
-#!/usr/bin/env python
+#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Project ___| | | | _ \| |