[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: I13ce8e8264679a19c7b108381ccb969573ea9ac6
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>
Sem-Ver: api-break

.zuul.d/project.yaml

@@ -1,10 +1,8 @@
 - project:
     templates:
       - check-requirements
-      - lib-forward-testing
       - lib-forward-testing-python3
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti

bindep.txt

@@ -2,8 +2,6 @@
 # see http://docs.openstack.org/infra/bindep/ for additional information.
 
 locales [platform:debian]
-python-dev [platform:dpkg]
-python-devel [platform:rpm]
 python3-all-dev [platform:ubuntu !platform:ubuntu-precise]
 python3-dev [platform:dpkg]
 python3-devel [platform:fedora]

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;python_version>='3.4' # BSD
+sphinx>=1.8.0,!=2.1.0 # BSD
 sphinxcontrib-apidoc>=0.2.0  # BSD
 openstackdocstheme>=1.20.0 # Apache-2.0
 reno>=2.5.0 # Apache-2.0

lower-constraints.txt

@@ -6,7 +6,6 @@ coverage==4.0
 debtcollector==1.2.0
 docutils==0.11
 dulwich==0.15.0
-enum34==1.0.4;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
 extras==1.0.0
 fixtures==3.0.0
 flake8==2.5.5

releasenotes/notes/drop-python27-support-87f1b4089d4cc78b.yaml

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

requirements.txt

@@ -9,5 +9,4 @@ stevedore>=1.20.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 rfc3986>=1.2.0 # Apache-2.0
 PyYAML>=3.12 # MIT
-enum34>=1.0.4;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
 requests>=2.18.0 # Apache-2.0

setup.cfg

@@ -1,11 +1,12 @@
 [metadata]
 name = oslo.config
-author = OpenStack
-author-email = openstack-discuss@lists.openstack.org
 summary = Oslo Configuration API
 description-file =
     README.rst
+author = OpenStack
+author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/oslo.config/latest/
+python-requires = >=3.6
 classifier =
     Development Status :: 5 - Production/Stable
     Environment :: OpenStack
@@ -14,20 +15,16 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: OS Independent
     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 =
     oslo_config
 
-[global]
-setup-hooks =
-    pbr.hooks.setup_hook
-
 [entry_points]
 console_scripts =
     oslo-config-generator = oslo_config.generator:main

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

@@ -1,8 +1,8 @@
 [tox]
 minversion = 3.1
 distribute = False
-envlist = py27,py37,pep8
-ignore_basepython_conflict = True
+envlist = py37,pep8
+ignore_basepython_conflict = true
 
 [testenv]
 basepython = python3