Drop support for python 2

Also adds support for py3.6 and py3.7 check and gate jobs.

Co-authored-by: xuanyandong <xuanyandong@inspur.com>
Co-authored-by: Brian Rosmaita <rosmaita.fossdev@gmail.com>

Closes-bug: #1853372

Change-Id: Ia978b692ade23ee6482957f41b17cb879c96fea7

.zuul.yaml

@@ -1,5 +1,6 @@
 - job:
-    name: python-cinderclient-functional
+    name: python-cinderclient-functional-base
+    abstract: true
     parent: devstack
     run: playbooks/python-cinderclient-functional.yaml
     post-run: playbooks/post.yaml
@@ -12,19 +13,47 @@
         USE_PYTHON3: true
         VOLUME_BACKING_FILE_SIZE: 16G
 
+- job:
+    name: python-cinderclient-functional-py36
+    parent: python-cinderclient-functional-base
+    vars:
+      python_version: 3.6
+      tox_envlist: functional-py36
+
+- job:
+    name: python-cinderclient-functional-py37
+    parent: python-cinderclient-functional-base
+    # Just to be clear what's going on here: which python is used by
+    # tox is controlled by tox.ini.  But, that python needs to
+    # actually be available on the node running the job in order for
+    # the job to succeed.  At this point, we can assume that 3.6 will
+    # be available everywhere (this is guaranteed by openstack-infra).
+    # But 3.7 is still problematic (don't ask me why).  So for this
+    # job that we want running in py3.7, we need to (a) specify a
+    # nodeset for which py3.7 is available, and (b) tell the job to
+    # make sure it's available (i.e., install it if necessary).
+    # (a) is handled by the 'nodeset' specification below.
+    # (b) is handled by the setting the 'python_version' variable
+    #     below, although by itself that doesn't do anything: it also
+    #     requires that the 'ensure-python' role is included in the
+    #     job playbook.
+    nodeset: openstack-single-node-bionic
+    vars:
+      python_version: 3.7
+      tox_envlist: functional-py37
+
 - 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
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check:
       jobs:
-        - python-cinderclient-functional
+        - python-cinderclient-functional-py36
+        - python-cinderclient-functional-py37
         - openstack-tox-pylint:
             voting: false

doc/requirements.txt

@@ -4,5 +4,4 @@
 # These are needed for docs generation
 openstackdocstheme>=1.20.0 # Apache-2.0
 reno>=2.5.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
-sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2;python_version>='3.4' # BSD

playbooks/python-cinderclient-functional.yaml

@@ -1,5 +1,6 @@
 - hosts: all
   roles:
+    - ensure-python
     - run-devstack
     # Run bindep and test-setup after devstack so that they won't interfere
     - role: bindep
@@ -9,6 +10,5 @@
     - get-os-environment
     - ensure-tox
     - role: tox
-      tox_envlist: functional
       tox_install_siblings: false
       environment: "{{ os_env_vars }}"

releasenotes/notes/drop-python2-support-d3a1bedc75445edc.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped.  Beginning with release 6.0.0,
+    the minimum version of Python supported by python-cinderclient is
+    Python 3.6.  The last version of python-cinderclient to support
+    Python 2.7 is the 5.x series from the Train release.

setup.cfg

@@ -15,8 +15,6 @@ 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

@@ -1,10 +1,15 @@
 [tox]
 distribute = False
-envlist = py27,py37,pep8
+envlist = py36,py37,pep8
-minversion = 2.0
+minversion = 3.1.0
 skipsdist = True
+skip_missing_interpreters = true
+# this allows tox to infer the base python from the environment name
+# and override any basepython configured in this file
+ignore_basepython_conflict=true
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install {opts} {packages}
 setenv =
@@ -25,11 +30,9 @@ commands = find . -type f -name "*.pyc" -delete
 whitelist_externals = find
 
 [testenv:pep8]
-basepython = python3
 commands = flake8
 
 [testenv:pylint]
-basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
@@ -38,11 +41,9 @@ commands = bash tools/lintstack.sh
 whitelist_externals = bash
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source cinderclient --parallel-mode
@@ -53,7 +54,6 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:docs]
-basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
@@ -61,7 +61,6 @@ deps =
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
-basepython = python3
 deps =
   {[testenv:docs]deps}
 commands =
@@ -73,7 +72,6 @@ whitelist_externals =
   cp
 
 [testenv:releasenotes]
-basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
@@ -81,24 +79,35 @@ deps =
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:functional]
-basepython = python3
 commands = stestr run {posargs}
 setenv =
   {[testenv]setenv}
   OS_TEST_PATH = ./cinderclient/tests/functional
   OS_VOLUME_API_VERSION = 3
+  # must define this here so it can be inherited by the -py3* environments
+  OS_CINDERCLIENT_EXEC_DIR = {envdir}/bin
+
 # The OS_CACERT environment variable should be passed to the test
 # environments to specify a CA bundle file to use in verifying a
 # TLS (https) server certificate.
 passenv = OS_*
 
+[testenv:functional-py36]
+setenv = {[testenv:functional]setenv}
+passenv = {[testenv:functional]passenv}
+commands = {[testenv:functional]commands}
+
+[testenv:functional-py37]
+setenv = {[testenv:functional]setenv}
+passenv = {[testenv:functional]passenv}
+commands = {[testenv:functional]commands}
+
 [flake8]
 show-source = True
 ignore = H404,H405,E122,E123,E128,E251
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt