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

This drops python2.7 support for cloudkittyclient. Even if this should be
done between milestone-1 and milestone-2, zuul jobs running on python2 are
currently broken since nova dropped python2.7 support.

Depends-On: https://review.opendev.org/#/c/693631/
Change-Id: I7615601540419e45259291a7bfce1cc038c27986

.zuul.yaml

@@ -21,6 +21,8 @@
         cloudkitty: https://opendev.org/openstack/cloudkitty
       devstack_localrc:
         CLOUDKITTY_FETCHER: keystone
+        DEVSTACK_GATE_USE_PYTHON3: "True"
+        USE_PYTHON3: True
       devstack_services:
         ck-api: true
         horizon: false
@@ -39,34 +41,11 @@
     vars:
       tox_envlist: functional-v2
 
-- job:
-    name: cloudkittyclient-devstack-functional-base-py3
-    parent: cloudkittyclient-devstack-functional-base
-    description: |
-      Job for cloudkittyclient functional tests, ran in python3.
-    vars:
-      devstack_localrc:
-        DEVSTACK_GATE_USE_PYTHON3: "True"
-        USE_PYTHON3: "True"
-
-- job:
-    name: cloudkittyclient-devstack-functional-v1-client-py3
-    parent: cloudkittyclient-devstack-functional-base-py3
-    vars:
-      tox_envlist: functional-v1
-
-- job:
-    name: cloudkittyclient-devstack-functional-v2-client-py3
-    parent: cloudkittyclient-devstack-functional-base-py3
-    vars:
-      tox_envlist: functional-v2
-
 - project:
     templates:
       - openstack-lower-constraints-jobs
       - check-requirements
       - openstack-cover-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - openstackclient-plugin-jobs
       - publish-openstack-docs-pti
@@ -76,17 +55,9 @@
             voting: true
         - cloudkittyclient-devstack-functional-v2-client:
             voting: true
-        - cloudkittyclient-devstack-functional-v1-client-py3:
-            voting: true
-        - cloudkittyclient-devstack-functional-v2-client-py3:
-            voting: true
     gate:
       jobs:
         - cloudkittyclient-devstack-functional-v1-client:
             voting: true
         - cloudkittyclient-devstack-functional-v2-client:
             voting: true
-        - cloudkittyclient-devstack-functional-v1-client-py3:
-            voting: true
-        - cloudkittyclient-devstack-functional-v2-client-py3:
-            voting: true

doc/requirements.txt

@@ -3,8 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 openstackdocstheme>=1.30.0 # Apache-2.0
-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-svg2pdfconverter>=0.1.0 # BSD
 reno>=2.5.0 # Apache-2.0
 cliff>=2.11.0 # Apache-2.0

releasenotes/notes/drop-py27-27ea9fb3e40d4987.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. The last release of
+    ``cloudkittyclient`` to support python 2.7 is OpenStack Train (3.1.0).
+    The minimum version of Python now supported by ``cloudkittyclient``
+    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/python-cloudkittyclient/latest/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -13,8 +14,6 @@ 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

tox.ini

@@ -1,9 +1,11 @@
 [tox]
-minversion = 2.0
-envlist = py27,py36,py37,pypy,pep8
+minversion = 3.1.1
+envlist = py36,py37,pep8
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv =
@@ -13,7 +15,6 @@ deps = -r{toxinidir}/requirements.txt
 commands = stestr run {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv =
     VIRTUAL_ENV={envdir}
     PYTHON=coverage run --source cloudkittyclient --parallel-mode
@@ -25,7 +26,6 @@ commands =
     coverage report
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper -t cloudkittyclient/tests {posargs}
 
 [testenv:functional-v1]
@@ -39,20 +39,16 @@ setenv = OS_RATING_API_VERSION=2
 commands = stestr run --concurrency=1 --test-path ./cloudkittyclient/tests/functional/v2
 
 [testenv:pep8]
-basepython = python3
 commands = flake8
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:docs]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build --keep-going -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
-basepython = python3
 envdir = {toxworkdir}/docs
 deps = {[testenv:docs]deps}
 whitelist_externals =
@@ -73,7 +69,6 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,releasenotes
 import_exceptions = cloudkittyclient.i18n
 
 [testenv:releasenotes]
-basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
   -r{toxinidir}/doc/requirements.txt
@@ -81,7 +76,6 @@ commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt