[ussuri][goal] Drop python 2.7 support and testing

OpenStack is dropping the py2.7 support in Ussuri cycle.

Complete discussion & schedule can be found in
-
http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Ussuri Communtiy-wide goal:
https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Change-Id: I340a7909c49e7d2a8c82c668cbdaf9ced7196f67
Sem-Ver: api-break

.zuul.yaml

@@ -1,12 +1,10 @@
 - project:
     templates:
       - check-requirements
-      - lib-forward-testing
       - lib-forward-testing-python3
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
+      - openstack-python3-ussuri-jobs
-      - openstack-python3-train-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3

doc/requirements.txt

@@ -2,8 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-sphinx>=1.8.0,<2.0.0;python_version=='2.7' # BSD
+sphinx>=1.8.0,!=2.1.0 # BSD
-sphinx>=1.8.0,!=2.1.0;python_version>='3.4' # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 reno>=2.5.0 # Apache-2.0
 sphinxcontrib-apidoc>=0.2.0  # BSD

oslo_i18n/tests/test_factory.py

@@ -61,18 +61,6 @@ class TranslatorFactoryTest(test_base.BaseTestCase):
         r = tf.primary('some text')
         self.assertNotIsInstance(r, _message.Message)
 
-    def test_py2(self):
-        _lazy.enable_lazy(False)
-        with mock.patch.object(six, 'PY3', False):
-            with mock.patch('gettext.translation') as translation:
-                trans = mock.Mock()
-                translation.return_value = trans
-                trans.gettext.side_effect = AssertionError(
-                    'should have called ugettext')
-                tf = _factory.TranslatorFactory('domain')
-                tf.primary('some text')
-                trans.ugettext.assert_called_with('some text')
-
     def test_py3(self):
         _lazy.enable_lazy(False)
         with mock.patch.object(six, 'PY3', True):
@@ -92,20 +80,6 @@ class TranslatorFactoryTest(test_base.BaseTestCase):
             tf._make_log_translation_func('mylevel')
             mtf.assert_called_with('domain-log-mylevel')
 
-    def test_contextual_form_py2(self):
-        _lazy.enable_lazy(False)
-        with mock.patch.object(six, 'PY3', False):
-            with mock.patch('gettext.translation') as translation:
-                trans = mock.Mock()
-                translation.return_value = trans
-                trans.gettext.side_effect = AssertionError(
-                    'should have called ugettext')
-                trans.ugettext.return_value = "some text"
-                tf = _factory.TranslatorFactory('domain')
-                tf.contextual_form('context', 'some text')
-                trans.ugettext.assert_called_with(
-                    "%s%s%s" % ('context', CONTEXT_SEPARATOR, 'some text'))
-
     def test_contextual_form_py3(self):
         _lazy.enable_lazy(False)
         with mock.patch.object(six, 'PY3', True):
@@ -120,19 +94,6 @@ class TranslatorFactoryTest(test_base.BaseTestCase):
                 trans.gettext.assert_called_with(
                     "%s%s%s" % ('context', CONTEXT_SEPARATOR, 'some text'))
 
-    def test_plural_form_py2(self):
-        _lazy.enable_lazy(False)
-        with mock.patch.object(six, 'PY3', False):
-            with mock.patch('gettext.translation') as translation:
-                trans = mock.Mock()
-                translation.return_value = trans
-                trans.ngettext.side_effect = AssertionError(
-                    'should have called ungettext')
-                tf = _factory.TranslatorFactory('domain')
-                tf.plural_form('single', 'plural', 1)
-                trans.ungettext.assert_called_with(
-                    'single', 'plural', 1)
-
     def test_plural_form_py3(self):
         _lazy.enable_lazy(False)
         with mock.patch.object(six, 'PY3', True):

releasenotes/notes/drop-python27-support-eb9c2ad3268f0c1f.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Support for Python 2.7 has been dropped. The minimum version of Python now
+    supported is Python 3.6.

setup.cfg

@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/oslo.i18n/latest
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -13,11 +14,12 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: Implementation :: CPython
+
 
 [files]
 packages =
@@ -36,6 +38,3 @@ input_file = oslo_i18n/locale/oslo_i18n.pot
 keywords = _ gettext ngettext l_ lazy_gettext _C:1c,2 _P:1,2
 mapping_file = babel.cfg
 output_file = oslo_i18n/locale/oslo_i18n.pot
-
-[bdist_wheel]
-universal = 1

setup.py

@@ -16,14 +16,6 @@
 # THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
 import setuptools
 
-# In python < 2.7.4, a lazy loading of package `pbr` will break
-# setuptools if some other modules registered functions in `atexit`.
-# solution from: http://bugs.python.org/issue15881#msg170215
-try:
-    import multiprocessing  # noqa
-except ImportError:
-    pass
-
 setuptools.setup(
     setup_requires=['pbr>=2.0.0'],
     pbr=True)

tox.ini

@@ -1,7 +1,7 @@
 [tox]
-minversion = 3.1
+minversion = 3.1.1
-envlist = py27,py37,pep8
+envlist = py37,pep8
-ignore_basepython_conflict = True
+ignore_basepython_conflict = true
 
 [testenv]
 basepython = python3