Drop python2.7 support

As per the official python support timeline
set forth by the OpenStack TC [1], OpenStack
Train (in our case, manila-ui 2.19.x
series) is the last release that will support
python2.7.

Depends-On: https://review.opendev.org/#/c/688997/
[1] https://governance.openstack.org/tc/resolutions/20180529-python2-deprecation-timeline.html

Change-Id: I5b4dc1853d7e4f8f736dd2a22eb08bcfdeac3411

.zuul.yaml

@@ -4,7 +4,6 @@
       - horizon-non-primary-django-jobs
       - openstack-cover-jobs-horizon
       - openstack-lower-constraints-jobs-horizon
-      - openstack-python-jobs-horizon
       - openstack-python3-ussuri-jobs-horizon
       - publish-openstack-docs-pti
       - release-notes-jobs-python3

doc/source/contributor/testing.rst

@@ -27,17 +27,11 @@ This is made possible by the dependency in test-requirements.txt upon the
 horizon source, which pulls down all of the horizon and openstack_dashboard
 modules that the plugin uses.
 
-To run only py27 unit tests, use following command::
+To run only py3 unit tests, use following command::
 
-    $ tox -e py27
-
-To run only py34 unit tests, use following command::
-
-    $ tox -e py34
+    $ tox -e py3
 
 To run unit tests using specific Django version use the following::
 
-    $ tox -e py27dj17
-    $ tox -e py27dj18
-    $ tox -e py27dj19
-    $ tox -e py27dj110
+    $ tox -e py3-dj22
+    $ tox -e py3-dj110

releasenotes/notes/drop-python2-support-8f7cbc2c3a758777.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. The last release of
+    openstack/manila-ui to support py2.7 is OpenStack Train (2.19.x). The
+    minimum version of Python now supported by openstack/manila-ui is
+    Python 3.6.

setup.cfg

@@ -13,8 +13,6 @@ 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 = 1.6
-envlist = py27,py37,pep8,py3-{dj111,dj22}
+envlist = py37,pep8,py3-{dj111,dj22}
 skipsdist = True
 
 [testenv]
+basepython = python3
 install_command = pip install {opts} {packages}
 usedevelop = True
 setenv =
@@ -16,9 +17,6 @@ commands =
   dj22: pip install django>=2.2,<2.3
   /bin/bash run_tests.sh -N --no-pep8 {posargs}
 
-[testenv:py27]
-setenv = DJANGO_SETTINGS_MODULE=manila_ui.tests.settings
-
 [testenv:py36]
 setenv = DJANGO_SETTINGS_MODULE=manila_ui.tests.settings
 
@@ -40,23 +38,18 @@ setenv =
   INTEGRATION_TESTS=1
   SELENIUM_HEADLESS=1
   HORIZON_INTEGRATION_TESTS_CONFIG_FILE=manila_ui/tests/integration/horizon.conf
-basepython = python2.7
 commands = {envpython} {toxinidir}/manage.py test manila_ui --settings=manila_ui.tests.settings --tag integration
 
 [testenv:pep8]
-basepython = python3
 commands = flake8
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 commands = {toxinidir}/tools/cover.sh {posargs}
 
 [testenv:docs]
-basepython = python3
 whitelist_externals = rm
 commands =
   rm -rf doc/build
@@ -64,7 +57,6 @@ commands =
 
 [testenv:pdf-docs]
 usedevelop = True
-basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
@@ -77,12 +69,10 @@ commands =
   make -C doc/build/pdf
 
 [testenv:releasenotes]
-basepython = python3
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees \
          -b html releasenotes/source releasenotes/build/html
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [flake8]
@@ -96,7 +86,6 @@ enable-extensions = H203,H106
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,.ropeproject,tools
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt