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remove python 3.9 support (#10406)

Browse Source 
Fixes https://github.com/certbot/certbot/issues/10389. you can compare
this to the PR that did this for python 3.8 at
https://github.com/certbot/certbot/pull/10077

additional changes:
- linux-py310 test is removed from extended tests, since it's now run in
standard tests. additionally, openssl will never be < 1.1.1 now, due to
https://peps.python.org/pep-0644/.
- `letstest/scripts/test_openssl_version.py` was testing functionality
that was removed in https://github.com/certbot/certbot/pull/10373 so it
was deleted

---------

Co-authored-by: Brad Warren <bmw@users.noreply.github.com>
This commit is contained in:
ohemorange
2025-08-12 17:49:02 +00:00
committed by GitHub
co-authored by Brad Warren
parent c519307569
commit 5d05984dd9
33 changed files with 39 additions and 136 deletions
Download Patch File Download Diff File Expand all files Collapse all files
.azure-pipelines/templates/jobs/extended-tests-jobs.yml
+2 -11
View File
@@ -8,12 +8,6 @@ jobs:
- group: certbot-common
strategy:
matrix:
linux-py39:
PYTHON_VERSION: 3.9
TOXENV: py39
linux-py310:
PYTHON_VERSION: 3.10
TOXENV: py310
linux-py311:
PYTHON_VERSION: 3.11
TOXENV: py311
@@ -23,14 +17,11 @@ jobs:
linux-isolated:
TOXENV: 'isolated-acme,isolated-certbot,isolated-apache,isolated-cloudflare,isolated-digitalocean,isolated-dnsimple,isolated-dnsmadeeasy,isolated-gehirn,isolated-google,isolated-linode,isolated-luadns,isolated-nsone,isolated-ovh,isolated-rfc2136,isolated-route53,isolated-sakuracloud,isolated-nginx'
linux-integration-certbot-oldest:
PYTHON_VERSION: 3.9
PYTHON_VERSION: 3.10
TOXENV: integration-certbot-oldest
linux-integration-nginx-oldest:
PYTHON_VERSION: 3.9
PYTHON_VERSION: 3.10
TOXENV: integration-nginx-oldest
linux-py39-integration:
PYTHON_VERSION: 3.9
TOXENV: integration
linux-py310-integration:
PYTHON_VERSION: 3.10
TOXENV: integration
.azure-pipelines/templates/jobs/standard-tests-jobs.yml
+4 -4
View File
@@ -12,13 +12,13 @@ jobs:
PIP_USE_PEP517: "true"
linux-oldest:
IMAGE_NAME: ubuntu-22.04
PYTHON_VERSION: 3.9
PYTHON_VERSION: 3.10
TOXENV: oldest
linux-py39:
linux-py310:
# linux unit tests with the oldest python we support
IMAGE_NAME: ubuntu-22.04
PYTHON_VERSION: 3.9
TOXENV: py39
PYTHON_VERSION: 3.10
TOXENV: py310
linux-cover:
# linux unit+cover tests with the newest python we support
IMAGE_NAME: ubuntu-22.04
acme/setup.py
+1 -2
View File
@@ -32,14 +32,13 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Intended Audience :: Developers',
'License :: OSI Approved :: Apache Software License',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
acme/src/acme/__init__.py
-8
View File
@@ -6,7 +6,6 @@ This module is an implementation of the `ACME protocol`_.
"""
import sys
import warnings
# This code exists to keep backwards compatibility with people using acme.jose
# before it became the standalone josepy package.
@@ -20,10 +19,3 @@ for mod in list(sys.modules):
# preserved (acme.jose.* is josepy.*)
if mod == 'josepy' or mod.startswith('josepy.'):
sys.modules['acme.' + mod.replace('josepy', 'jose', 1)] = sys.modules[mod]
if sys.version_info[:2] == (3, 9):
warnings.warn(
"Python 3.9 support will be dropped in the next planned release of "
"acme. Please upgrade your Python version.",
DeprecationWarning,
) # pragma: no cover
certbot-apache/setup.py
+1 -2
View File
@@ -28,7 +28,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -37,7 +37,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-ci/setup.py
+1 -2
View File
@@ -31,14 +31,13 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 3 - Alpha',
'Intended Audience :: Developers',
'License :: OSI Approved :: Apache Software License',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-compatibility-test/setup.py
+1 -2
View File
@@ -18,14 +18,13 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 3 - Alpha',
'Intended Audience :: Developers',
'License :: OSI Approved :: Apache Software License',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-cloudflare/setup.py
+1 -2
View File
@@ -39,7 +39,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -48,7 +48,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-digitalocean/setup.py
+1 -2
View File
@@ -37,7 +37,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-dnsimple/setup.py
+1 -2
View File
@@ -39,7 +39,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -48,7 +48,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-dnsmadeeasy/setup.py
+1 -2
View File
@@ -37,7 +37,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-gehirn/setup.py
+1 -2
View File
@@ -37,7 +37,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-google/setup.py
+1 -2
View File
@@ -38,7 +38,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -47,7 +47,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-linode/setup.py
+1 -2
View File
@@ -37,7 +37,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-luadns/setup.py
+1 -2
View File
@@ -37,7 +37,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-nsone/setup.py
+1 -2
View File
@@ -37,7 +37,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-ovh/setup.py
+1 -2
View File
@@ -37,7 +37,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-rfc2136/setup.py
+1 -2
View File
@@ -40,7 +40,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -49,7 +49,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-route53/setup.py
+1 -2
View File
@@ -37,7 +37,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-dns-sakuracloud/setup.py
+1 -2
View File
@@ -37,7 +37,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -46,7 +46,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot-nginx/setup.py
+1 -2
View File
@@ -27,7 +27,7 @@ setup(
author="Certbot Project",
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Environment :: Plugins',
@@ -36,7 +36,6 @@ setup(
'Operating System :: POSIX :: Linux',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
certbot/pyproject.toml
+2 -3
View File
@@ -8,7 +8,7 @@ dynamic = ["version", "dependencies"]
description = "ACME client"
readme = "README.rst"
license = "Apache-2.0"
requires-python = ">=3.9.2"
requires-python = ">=3.10"
authors = [
{ name = "Certbot Project", email = "certbot-dev@eff.org" },
]
@@ -19,11 +19,10 @@ classifiers = [
"Operating System :: POSIX :: Linux",
"Programming Language :: Python",
"Programming Language :: Python :: 3",
"Programming Language :: Python :: 3.13",
"Programming Language :: Python :: 3.9",
"Programming Language :: Python :: 3.10",
"Programming Language :: Python :: 3.11",
"Programming Language :: Python :: 3.12",
"Programming Language :: Python :: 3.13",
"Topic :: Internet :: WWW/HTTP",
"Topic :: Security",
"Topic :: System :: Installation/Setup",
certbot/src/certbot/__init__.py
-10
View File
@@ -1,14 +1,4 @@
"""Certbot client."""
import sys
import warnings
# version number like 1.2.3a0, must have at least 2 parts, like 1.2
__version__ = '5.0.0.dev0'
if sys.version_info[:2] == (3, 9):
warnings.warn(
"Python 3.9 support will be dropped in the next planned release of "
"certbot. Please upgrade your Python version.",
DeprecationWarning,
) # pragma: no cover
certbot/src/certbot/_internal/main.py
-4
View File
@@ -1864,10 +1864,6 @@ def main(cli_args: Optional[list[str]] = None) -> Optional[Union[str, int]]:
if config.func != plugins_cmd: # pylint: disable=comparison-with-callable
raise
if sys.version_info[:2] == (3, 9):
logger.warning("Python 3.9 support will be dropped in the next planned release "
"of Certbot - please upgrade your Python version.")
with make_displayer(config) as displayer:
display_obj.set_display(displayer)
letstest/scripts/test_apache2.sh
+5 -15
View File
@@ -48,10 +48,8 @@ eval "$(pyenv init --path)"
eval "$(pyenv init -)"
# Install and configure Python
# Python<=3.9 must be used because Python 3.10 requires too new of a version of
# OpenSSL.
pyenv install 3.9.10
pyenv shell 3.9.10
pyenv install 3.10
pyenv shell 3.10
tools/venv.py -e acme -e certbot -e certbot-apache -e certbot-ci tox
PEBBLE_LOGS="acme_server.log"
@@ -92,18 +90,10 @@ sudo "venv/bin/certbot" -v --debug --text --agree-tos --no-verify-ssl \
--renew-by-default --redirect --register-unsafely-without-email \
--domain "${PUBLIC_HOSTNAME}" --server "${PEBBLE_URL}"
# Check that ssl_module detection is working on various systems
if [ "$OS_TYPE" = "ubuntu" ] ; then
MOD_SSL_LOCATION="/usr/lib/apache2/modules/mod_ssl.so"
APACHE_NAME=apache2ctl
elif [ "$OS_TYPE" = "centos" ]; then
MOD_SSL_LOCATION="/etc/httpd/modules/mod_ssl.so"
APACHE_NAME=httpd
if ! grep -q SSLSessionTickets /etc/letsencrypt/options-ssl-apache.conf; then
echo "modern TLS options were not used"
exit 1
fi
OPENSSL_VERSION=$(strings "$MOD_SSL_LOCATION" | egrep -o -m1 '^OpenSSL ([0-9]\.[^ ]+) ' | tail -c +9)
APACHE_VERSION=$(sudo $APACHE_NAME -v | egrep -o 'Apache/([0-9]\.[^ ]+)' | tail -c +8)
"venv/bin/python" letstest/scripts/test_openssl_version.py "$OPENSSL_VERSION" "$APACHE_VERSION"
if [ "$OS_TYPE" = "ubuntu" ] ; then
export SERVER="${PEBBLE_URL}"
letstest/scripts/test_openssl_version.py
-31
View File
@@ -1,31 +0,0 @@
#!/usr/bin/env python
# Test script for OpenSSL version checking
import sys
from certbot import util
def main(openssl_version, apache_version):
if not openssl_version.strip():
raise Exception("No OpenSSL version found.")
if not apache_version.strip():
raise Exception("No Apache version found.")
conf_file_location = "/etc/letsencrypt/options-ssl-apache.conf"
with open(conf_file_location) as f:
contents = f.read()
if util.parse_loose_version(apache_version.strip()) < util.parse_loose_version('2.4.11') or \
util.parse_loose_version(openssl_version.strip()) < util.parse_loose_version('1.0.2l'):
# should be old version
# assert SSLSessionTickets not in conf file
if "SSLSessionTickets" in contents:
raise Exception("Apache or OpenSSL version is too old, "
"but SSLSessionTickets is set.")
else:
# should be current version
# assert SSLSessionTickets in conf file
if "SSLSessionTickets" not in contents:
raise Exception("Apache and OpenSSL versions are sufficiently new, "
"but SSLSessionTickets is not set.")
if __name__ == '__main__':
main(*sys.argv[1:])
letstest/setup.py
+1 -2
View File
@@ -9,14 +9,13 @@ setup(
author='Certbot Project',
author_email='certbot-dev@eff.org',
license='Apache License 2.0',
python_requires='>=3.9.2',
python_requires='>=3.10',
classifiers=[
'Development Status :: 5 - Production/Stable',
'Intended Audience :: Developers',
'License :: OSI Approved :: Apache Software License',
'Programming Language :: Python',
'Programming Language :: Python :: 3',
'Programming Language :: Python :: 3.9',
'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
newsfragments/10389.changed
+1
View File
@@ -0,0 +1 @@
Python 3.9 support was removed.
pytest.ini
-2
View File
@@ -21,11 +21,9 @@
# from dateutil. See https://github.com/dateutil/dateutil/issues/1314.
# 4) Planning to remove support for checking OCSP via OpenSSL binary.
# See https://github.com/certbot/certbot/issues/10291.
# 5) Ignore our own DeprecationWarning about Python 3.9 soon to be dropped.
filterwarnings =
error
ignore:.*rsyncdir:DeprecationWarning
ignore:'urllib3.contrib.pyopenssl:DeprecationWarning:requests_toolbelt
ignore:.*datetime.utcfromtimestamp\(\) is deprecated:DeprecationWarning:dateutil
ignore:enforce_openssl_binary_usage parameter is deprecated:DeprecationWarning
ignore:Python 3.9 support will be dropped:DeprecationWarning
tools/pinning/current/pyproject.toml
+1 -5
View File
@@ -6,11 +6,7 @@ authors = ["Certbot Project"]
license = "Apache License 2.0"
[tool.poetry.dependencies]
# python 3.9.2 is used as a lower bound here because newer versions of
# cryptography dropped support for python 3.9.0 and 3.9.1. see
# https://github.com/pyca/cryptography/pull/12045. when we drop support for
# python 3.9 altogether, this line can be changed to the simpler 'python = "^3.10"'.
python = ">=3.9.2,<4.0"
python = "^3.10"
# Local dependencies
# Any local packages that have dependencies on other local packages must be
tools/pinning/oldest/pyproject.toml
+1 -1
View File
@@ -18,7 +18,7 @@ license = "Apache License 2.0"
[tool.poetry.dependencies]
# The Python version here should be kept in sync with the one used in our
# oldest tests in tox.ini.
python = "<3.10 >= 3.9.2"
python = "<3.11 >= 3.10"
# Local dependencies
# Any local packages that have dependencies on other local packages must be
tools/venv.py
+1 -1
View File
@@ -116,7 +116,7 @@ def _check_version(version_str):
version = (int(search.group(1)), int(search.group(2)))
if version >= (3, 9):
if version >= (3, 10):
return True
print('Incompatible python version for Certbot found: {0}'.format(version_str))
tox.ini
+3 -3
View File
@@ -52,10 +52,10 @@ commands =
commands =
{[base]pytest} acme certbot certbot-dns-cloudflare certbot-dns-digitalocean certbot-dns-dnsimple certbot-dns-dnsmadeeasy certbot-dns-gehirn certbot-dns-google certbot-dns-linode certbot-dns-luadns certbot-dns-nsone certbot-dns-ovh certbot-dns-rfc2136 certbot-dns-route53 certbot-dns-sakuracloud certbot-nginx certbot-apache
[testenv:py3{,9,10,11,12,13}]
[testenv:py3{,10,11,12,13}]
commands = {[testenv:py]commands}
[testenv:py3.{9,10,11,12,13}]
[testenv:py3.{10,11,12,13}]
commands = {[testenv:py]commands}
[testenv:oldest]
@@ -65,7 +65,7 @@ commands = {[testenv:py]commands}
#
# This version should be kept in sync with the one declared in
# tools/pinning/oldest/pyproject.toml.
basepython = python3.9
basepython = python3.10
setenv = CERTBOT_OLDEST=1
commands = {[testenv:py]commands}