Add Python 3.9 to the CI

- Recommend Python 3.9

py39.patch

@@ -0,0 +1,13 @@
+diff --git a/src/tox/constants.py b/src/tox/constants.py
+index 8dcc86b..1c90e47 100644
+--- a/src/tox/constants.py
++++ b/src/tox/constants.py
+@@ -30,7 +30,7 @@ def _construct_default_factors(cpython_versions, pypy_versions, other_interprete
+ 
+ class PYTHON:
+     PY_FACTORS_RE = re.compile("^(?!py$)(py|pypy|jython)([2-9][0-9]?)?$")
+-    CPYTHON_VERSION_TUPLES = [(2, 7), (3, 4), (3, 5), (3, 6), (3, 7), (3, 8)]
++    CPYTHON_VERSION_TUPLES = [(2, 7), (3, 4), (3, 5), (3, 6), (3, 7), (3, 8), (3, 9)]
+     PYPY_VERSION_TUPLES = [(2, 7), (3, 5)]
+     OTHER_PYTHON_INTERPRETERS = ["jython"]
+     DEFAULT_FACTORS = _construct_default_factors(

python-tox.spec

@@ -8,7 +8,7 @@
 %global pypi_name tox
 Name:           python-%{pypi_name}
 Version:        3.13.2
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Virtualenv-based automation of test activities
 
 License:        MIT
@@ -19,6 +19,10 @@ Source0:        %{pypi_source}
 # Rebased from https://github.com/tox-dev/tox/pull/1368
 Patch0:         1368.patch
 
+# Run py39 env with Python 3.9
+# https://bugzilla.redhat.com/show_bug.cgi?id=1798929
+Patch1:         py39.patch
+
 BuildArch:      noarch
 
 %description
@@ -55,6 +59,7 @@ Recommends:     python35
 Recommends:     python36
 Recommends:     python37
 Recommends:     python38
+Recommends:     python39
 Recommends:     pypy2-devel
 Recommends:     pypy3-devel
 Recommends:     python2-devel
@@ -146,6 +151,10 @@ rm -rf .path
 %{python3_sitelib}/%{pypi_name}-%{version}-py%{python3_version}.egg-info/
 
 %changelog
+* Thu Feb 06 2020 Miro Hrončok <mhroncok@redhat.com> - 3.13.2-3
+- Fix invocation with Python 3.9 (#1798929)
+- Recommend Python 3.9
+
 * Fri Jul 26 2019 Fedora Release Engineering <releng@fedoraproject.org> - 3.13.2-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
 

tests/tests.yml

@@ -34,6 +34,9 @@
     - smoke38:
         dir: python/smoke
         run: VERSION=3.8 ./venv.sh
+    - smoke39:
+        dir: python/smoke
+        run: VERSION=3.9 ./venv.sh
     required_packages:
     - gcc
     - virtualenv
@@ -43,6 +46,7 @@
     - python36
     - python37
     - python38
+    - python39
     - python2-devel
     - python3-devel
     - python3-tox