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

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

Designate is ready with python 3 and ok to drop the
python 2.7 support.

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

Depends-On: https://review.opendev.org/#/c/693631/
Change-Id: I5a5bdc859f87f82097b95b2ebb31edb6e9b72b3a

.zuul.yaml

@@ -62,34 +62,6 @@
         postgresql: True
     voting: false
 
-
-- job:
-    name: designate-bind9-py27
-    parent: designate-bind9
-    vars:
-      devstack_localrc:
-        USE_PYTHON3: false
-      devstack_services:
-        s-account: true
-        s-container: true
-        s-object: true
-        s-proxy: true
-        c-bak: true
-
-
-- job:
-    name: designate-pdns4-py27
-    parent: designate-pdns4
-    vars:
-      devstack_localrc:
-        USE_PYTHON3: false
-      devstack_services:
-        s-account: false
-        s-container: false
-        s-object: false
-        s-proxy: false
-        c-bak: false
-
 - job:
     name: designate-ipv6-only-bind9
     post-run: playbooks/designate-bind9/post.yaml
@@ -129,8 +101,6 @@
       jobs:
         - designate-bind9
         - designate-pdns4
-        - designate-bind9-py27
-        - designate-pdns4-py27
         - designate-pdns4-postgres
         - designate-grenade-pdns4
         - designate-ipv6-only-pdns4
@@ -141,8 +111,6 @@
       jobs:
         - designate-bind9
         - designate-pdns4
-        - designate-bind9-py27
-        - designate-pdns4-py27
         - designate-grenade-pdns4
         - designate-ipv6-only-pdns4
         - designate-ipv6-only-bind9
@@ -152,7 +120,6 @@
       - designate-devstack-jobs
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti
       - periodic-stable-jobs

doc/requirements.txt

@@ -1,7 +1,6 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-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;python_version>='3.4'  # BSD
 sphinxcontrib-httpdomain>=1.3.0 # BSD
 sphinxcontrib-blockdiag>=1.5.4 # BSD

playbooks/legacy/designate-devstack-agent-base/run.yaml

@@ -48,6 +48,7 @@
           export DEVSTACK_GATE_TEMPEST=1
           export DEVSTACK_GATE_TEMPEST_ALL_PLUGINS=1
           export DEVSTACK_GATE_TEMPEST_REGEX=designate
+          export DEVSTACK_GATE_USE_PYTHON3=True
 
           export PROJECTS="openstack/designate $PROJECTS"
           export PROJECTS="openstack/python-designateclient $PROJECTS"

playbooks/legacy/designate-devstack-base/run.yaml

@@ -72,9 +72,7 @@
               export DEVSTACK_GATE_POSTGRES=1
           fi
 
-          if [ "{{ python_version }}" == "py35" ] ; then
+          export DEVSTACK_GATE_USE_PYTHON3=True
-             export DEVSTACK_GATE_USE_PYTHON3=True
-          fi
 
           cp devstack-gate/devstack-vm-gate-wrap.sh ./safe-devstack-vm-gate-wrap.sh
           ./safe-devstack-vm-gate-wrap.sh

playbooks/legacy/grenade-devstack-designate-pdns4/run.yaml

@@ -49,6 +49,7 @@
           export DEVSTACK_GATE_GRENADE=pullup
           export DEVSTACK_GATE_TEMPEST_REGEX="designate_tempest_plugin(?!\.tests.api.v1).*"
           export DEVSTACK_GATE_HORIZON=1
+          export DEVSTACK_GATE_USE_PYTHON3=True
 
           export PROJECTS="openstack/designate $PROJECTS"
           export PROJECTS="openstack/python-designateclient $PROJECTS"

releasenotes/notes/drop-py-2-7-737ea2547cb7ea06.yaml

@@ -0,0 +1,8 @@
+---
+prelude: >
+    Drop the Python 2.7 support.
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of Designate
+    to support python 2.7 is OpenStack Train. The minimum version of Python now
+    supported by Designate is Python 3.6.

requirements.txt

@@ -37,7 +37,6 @@ sqlalchemy-migrate>=0.11.0 # Apache-2.0
 stevedore>=1.20.0 # Apache-2.0
 suds-jurko>=0.6 # LGPLv3+
 WebOb>=1.7.1 # MIT
-dnspython>=1.14.0;python_version=='2.7' # http://www.dnspython.org/LICENSE
 dnspython3!=1.13.0,!=1.14.0,>=1.12.0;python_version>='3.0' # http://www.dnspython.org/LICENSE
 oslo.db>=4.27.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0

setup.cfg

@@ -14,8 +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 +1,10 @@
 [tox]
 minversion = 2.3.2
-envlist = py27,py37,flake8
+envlist = py37,flake8
 skipsdist = True
 
 [testenv]
+basepython = python3
 setenv =
   VIRTUAL_ENV={envdir}
   LANGUAGE=C.UTF-8
@@ -37,12 +38,6 @@ whitelist_externals =
   find
   rm
 
-[testenv:py27]
-commands =
-  {[testenv]commands}
-  stestr run {posargs}
-  stestr slowest
-
 [testenv:py36]
 basepython = python3.6
 commands =
@@ -56,7 +51,6 @@ commands =
   stestr run '{posargs}'
 
 [testenv:docs]
-basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
   -r{toxinidir}/requirements.txt
@@ -66,7 +60,6 @@ commands =
     sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
-basepython = python3
 deps = {[testenv:docs]deps}
 whitelist_externals =
   make
@@ -75,7 +68,6 @@ commands =
   make -C doc/build/pdf
 
 [testenv:cover]
-basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source designate --parallel-mode
@@ -89,39 +81,32 @@ commands =
   coverage xml -o cover/coverage.xml
 
 [testenv:bandit]
-basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = bandit -r designate -n5 -x 'designate/tests/*' -t \
   B505,B504,B503,B502,B501,B604,B605,B001,B601,B602,B701,B609,B702,\
   B608,B506,B312,B310,B411,B108,B103,B102,B309,B308,B302,B307,B306
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper -t designate/tests {posargs}
 
 [testenv:flake8]
-basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = sh tools/pretty_flake8.sh
   {[testenv:bandit]commands}
 
 [testenv:pep8]
 deps = -r{toxinidir}/test-requirements.txt
-basepython = python3
 commands = sh tools/pretty_flake8.sh
   {[testenv:bandit]commands}
   doc8 {posargs}
 
 [testenv:genconfig]
-basepython = python3
 commands = oslo-config-generator --config-file=etc/designate/designate-config-generator.conf
 
 [testenv:genpolicy]
-basepython = python3
 commands = oslopolicy-sample-generator --config-file etc/designate/designate-policy-generator.conf
 
 [testenv:bashate]
-basepython = python3
 deps = bashate
 whitelist_externals = bash
 commands = bash -c "find {toxinidir}/devstack         \
@@ -139,7 +124,6 @@ commands = bash -c "find {toxinidir}/devstack         \
          -print0 | xargs -0 bashate -v"
 
 [testenv:pip-check-reqs]
-basepython = python3
 # do not install test-requirements as that will pollute the virtualenv for
 # determining missing packages
 # this also means that pip-missing-reqs must be installed separately, outside
@@ -149,7 +133,6 @@ deps = pip-check-reqs
 commands=pip-missing-reqs -d --ignore-file=designate/tests/* designate
 
 [testenv:api-ref]
-basepython = python3
 # This environment is called from CI scripts to test and publish
 # the API Ref to docs.openstack.org.
 deps =
@@ -160,7 +143,6 @@ commands =
   sphinx-build -E -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
 
 [testenv:releasenotes]
-basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
   -r{toxinidir}/requirements.txt
@@ -170,7 +152,6 @@ commands =
     sphinx-build -a -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
@@ -201,7 +182,6 @@ local-check-factory = designate.hacking.checks.factory
 import_exceptions = designate.i18n
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt