Be explicit about python3 executable

Per best practices, explicitly use the python3 executable rather than
assuming the platform with have a "python" executable that maps to
python3.

https://www.python.org/dev/peps/pep-0394/

Change-Id: I39b8a1013a891f4570f374d8faa3cfa2ecaf3347
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

openstack_releases/cmds/mail.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 #    Licensed under the Apache License, Version 2.0 (the "License"); you may
 #    not use this file except in compliance with the License. You may obtain
 #    a copy of the License at

openstack_releases/pythonutils.py

@@ -44,9 +44,9 @@ def get_sdist_name(workdir, repo):
             cwd=dest,
         )
     if use_tox:
-        python = '.tox/venv/bin/python'
+        python = '.tox/venv/bin/python3'
     else:
-        python = 'python'
+        python = 'python3'
     # Run it once and discard the result to ensure any setup_requires
     # dependencies are installed.
     cmd = [python, 'setup.py', '--name']
@@ -77,9 +77,9 @@ def build_sdist(workdir, repo):
             cwd=dest,
         )
     if use_tox:
-        python = '.tox/venv/bin/python'
+        python = '.tox/venv/bin/python3'
     else:
-        python = 'python'
+        python = 'python3'
     # Run it once and discard the result to ensure any setup_requires
     # dependencies are installed.
     cmd = [python, 'setup.py', 'sdist', 'bdist_wheel']

openstack_releases/requirements.py

@@ -88,7 +88,7 @@ def get_min_specifier(specifier_set):
 def get_requirements_at_ref(workdir, repo, ref):
     "Check out the repo at the ref and load the list of requirements."
     dest = gitutils.clone_repo(workdir, repo, ref=ref)
-    processutils.check_call(['python', 'setup.py', 'sdist'], cwd=dest)
+    processutils.check_call(['python3', 'setup.py', 'sdist'], cwd=dest)
     sdist_name = pythonutils.get_sdist_name(workdir, repo)
     requirements_filename = os.path.join(
         dest, sdist_name + '.egg-info', 'requires.txt',

tools/aclissues.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 #
 # Tool to generate a patch to remove direct tagging / branch-creating
 # rights for official OpenStack deliverables

tools/aclmanager.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 #
 # Handle pre-release / post-release ACLs for milestone-driven projects
 #

tools/discover_branch_points.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 #
 # All Rights Reserved.
 #

tools/list_weeks.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 
 #  Licensed under the Apache License, Version 2.0 (the "License"); you may
 #  not use this file except in compliance with the License. You may obtain

tools/membership_freeze_test.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 #
 # List deliverables that appear in governance but not in releases
 # in preparation for MemberShipFreeze

tools/tag_history_from_git.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 #
 # All Rights Reserved.
 #

tools/verify_branches_and_late_releases.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python3
 #
 # Scan the releases for a series that came after the project's branch
 # and verify that they are all on the right branch.