bump MIN_PYTHON_3_VERSION

This reverts commit 270b5535e2.

.azure-pipelines/templates/jobs/extended-tests-jobs.yml

@@ -36,14 +36,6 @@ jobs:
           PYTHON_VERSION: 2.7
           TOXENV: integration
           ACME_SERVER: boulder-v2
-        linux-boulder-v1-py35-integration:
-          PYTHON_VERSION: 3.5
-          TOXENV: integration
-          ACME_SERVER: boulder-v1
-        linux-boulder-v2-py35-integration:
-          PYTHON_VERSION: 3.5
-          TOXENV: integration
-          ACME_SERVER: boulder-v2
         linux-boulder-v1-py36-integration:
           PYTHON_VERSION: 3.6
           TOXENV: integration

.azure-pipelines/templates/jobs/standard-tests-jobs.yml

@@ -10,10 +10,10 @@ jobs:
           IMAGE_NAME: macOS-10.14
           PYTHON_VERSION: 3.8
           TOXENV: py38
-        windows-py35:
+        windows-py36:
           IMAGE_NAME: vs2017-win2016
-          PYTHON_VERSION: 3.5
-          TOXENV: py35
+          PYTHON_VERSION: 3.6
+          TOXENV: py36
         windows-py37-cover:
           IMAGE_NAME: vs2017-win2016
           PYTHON_VERSION: 3.7
@@ -32,10 +32,10 @@ jobs:
           IMAGE_NAME: ubuntu-18.04
           PYTHON_VERSION: 2.7
           TOXENV: py27
-        linux-py35:
+        linux-py36:
           IMAGE_NAME: ubuntu-18.04
-          PYTHON_VERSION: 3.5
-          TOXENV: py35
+          PYTHON_VERSION: 3.6
+          TOXENV: py36
         linux-py38-cover:
           IMAGE_NAME: ubuntu-18.04
           PYTHON_VERSION: 3.8
@@ -44,9 +44,9 @@ jobs:
           IMAGE_NAME: ubuntu-18.04
           PYTHON_VERSION: 3.7
           TOXENV: lint
-        linux-py35-mypy:
+        linux-py36-mypy:
           IMAGE_NAME: ubuntu-18.04
-          PYTHON_VERSION: 3.5
+          PYTHON_VERSION: 3.6
           TOXENV: mypy
         linux-integration:
           IMAGE_NAME: ubuntu-18.04

acme/acme/__init__.py

@@ -20,11 +20,3 @@ 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, 5):
-    warnings.warn(
-            "Python 3.5 support will be dropped in the next release of "
-            "acme. Please upgrade your Python version.",
-            PendingDeprecationWarning,
-    )  # pragma: no cover

acme/setup.py

@@ -71,7 +71,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
@@ -80,7 +80,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-apache/setup.py

@@ -55,7 +55,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -66,7 +66,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-ci/setup.py

@@ -40,7 +40,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 3 - Alpha',
         'Intended Audience :: Developers',
@@ -49,7 +49,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-compatibility-test/setup.py

@@ -38,7 +38,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 3 - Alpha',
         'Intended Audience :: Developers',
@@ -47,7 +47,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-cloudflare/setup.py

@@ -64,7 +64,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -75,7 +75,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-cloudxns/setup.py

@@ -64,7 +64,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -75,7 +75,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-digitalocean/setup.py

@@ -65,7 +65,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -76,7 +76,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-dnsimple/setup.py

@@ -75,7 +75,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -86,7 +86,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-dnsmadeeasy/setup.py

@@ -64,7 +64,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -75,7 +75,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-gehirn/setup.py

@@ -63,7 +63,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -74,7 +74,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-google/setup.py

@@ -67,7 +67,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -78,7 +78,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-linode/setup.py

@@ -63,7 +63,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -74,7 +74,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-luadns/setup.py

@@ -64,7 +64,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -75,7 +75,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-nsone/setup.py

@@ -64,7 +64,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -75,7 +75,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-ovh/setup.py

@@ -64,7 +64,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -75,7 +75,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-rfc2136/setup.py

@@ -64,7 +64,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -75,7 +75,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-route53/setup.py

@@ -59,7 +59,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -70,7 +70,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-dns-sakuracloud/setup.py

@@ -63,7 +63,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -74,7 +74,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot-nginx/setup.py

@@ -52,7 +52,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Plugins',
@@ -63,7 +63,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

certbot/CHANGELOG.md

@@ -10,7 +10,7 @@ Certbot adheres to [Semantic Versioning](https://semver.org/).
 
 ### Changed
 
-*
+* Support for Python 3.5 has been removed.
 
 ### Fixed
 

certbot/certbot/__init__.py

@@ -1,13 +1,4 @@
 """Certbot client."""
-import warnings
-import sys
 
 # version number like 1.2.3a0, must have at least 2 parts, like 1.2
 __version__ = '1.8.0.dev0'
-
-if sys.version_info[:2] == (3, 5):
-    warnings.warn(
-            "Python 3.5 support will be dropped in the next release of "
-            "certbot. Please upgrade your Python version.",
-            PendingDeprecationWarning,
-    )  # pragma: no cover

certbot/certbot/_internal/main.py

@@ -1343,10 +1343,6 @@ def main(cli_args=None):
         if config.func != plugins_cmd:  # pylint: disable=comparison-with-callable
             raise
 
-    if sys.version_info[:2] == (3, 5):
-        logger.warning("Python 3.5 support will be dropped in the next release "
-                       "of Certbot - please upgrade your Python version.")
-
     set_displayer(config)
 
     # Reporter

certbot/certbot/compat/filesystem.py

@@ -340,8 +340,9 @@ def replace(src, dst):
     :param str dst: The new file path.
     """
     if hasattr(os, 'replace'):
-        # Use replace if possible. On Windows, only Python >= 3.5 is supported
-        # so we can assume that os.replace() is always available for this platform.
+        # Use replace if possible. Since we don't support Python 2 on Windows
+        # and os.replace() was added in Python 3.3, we can assume that
+        # os.replace() is always available on Windows.
         getattr(os, 'replace')(src, dst)
     else:
         # Otherwise, use os.rename() that behaves like os.replace() on Linux.

certbot/docs/contributing.rst

@@ -593,7 +593,7 @@ OS-level dependencies can be installed like so:
 In general...
 
 * ``sudo`` is required as a suggested way of running privileged process
-* `Python`_ 2.7 or 3.5+ is required
+* `Python`_ 2.7 or 3.6+ is required
 * `Augeas`_ is required for the Python bindings
 * ``virtualenv`` is used for managing other Python library dependencies
 

certbot/docs/install.rst

@@ -28,7 +28,7 @@ your system.
 System Requirements
 ===================
 
-Certbot currently requires Python 2.7 or 3.5+ running on a UNIX-like operating
+Certbot currently requires Python 2.7 or 3.6+ running on a UNIX-like operating
 system. By default, it requires root access in order to write to
 ``/etc/letsencrypt``, ``/var/log/letsencrypt``, ``/var/lib/letsencrypt``; to
 bind to port 80 (if you use the ``standalone`` plugin) and to read and

certbot/setup.py

@@ -133,7 +133,7 @@ setup(
     author="Certbot Project",
     author_email='client-dev@letsencrypt.org',
     license='Apache License 2.0',
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Environment :: Console',
@@ -145,7 +145,6 @@ setup(
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',

letsencrypt-auto-source/letsencrypt-auto

@@ -258,7 +258,7 @@ DeprecationBootstrap() {
 
 MIN_PYTHON_2_VERSION="2.7"
 MIN_PYVER2=$(echo "$MIN_PYTHON_2_VERSION" | sed 's/\.//')
-MIN_PYTHON_3_VERSION="3.5"
+MIN_PYTHON_3_VERSION="3.6"
 MIN_PYVER3=$(echo "$MIN_PYTHON_3_VERSION" | sed 's/\.//')
 # Sets LE_PYTHON to Python version string and PYVER to the first two
 # digits of the python version.

letsencrypt-auto-source/letsencrypt-auto.template

@@ -258,7 +258,7 @@ DeprecationBootstrap() {
 
 MIN_PYTHON_2_VERSION="2.7"
 MIN_PYVER2=$(echo "$MIN_PYTHON_2_VERSION" | sed 's/\.//')
-MIN_PYTHON_3_VERSION="3.5"
+MIN_PYTHON_3_VERSION="3.6"
 MIN_PYVER3=$(echo "$MIN_PYTHON_3_VERSION" | sed 's/\.//')
 # Sets LE_PYTHON to Python version string and PYVER to the first two
 # digits of the python version.

tools/_venv_common.py

@@ -56,11 +56,15 @@ def find_python_executable(python_major):
     """
     Find the relevant python executable that is of the given python major version.
     Will test, in decreasing priority order:
+
     * the current Python interpreter
     * 'pythonX' executable in PATH (with X the given major version) if available
     * 'python' executable in PATH if available
     * Windows Python launcher 'py' executable in PATH if available
-    Incompatible python versions for Certbot will be evicted (eg. Python < 3.5 on Windows)
+
+    Incompatible python versions for Certbot will be evicted (e.g. Python 3
+    versions less than 3.6).
+
     :param int python_major: the Python major version to target (2 or 3)
     :rtype: str
     :return: the relevant python executable path
@@ -113,10 +117,8 @@ def _check_version(version_str, major_version):
     version = (int(search.group(1)), int(search.group(2)))
 
     minimal_version_supported = (2, 7)
-    if major_version == 3 and os.name == 'nt':
-        minimal_version_supported = (3, 5)
-    elif major_version == 3:
-        minimal_version_supported = (3, 4)
+    if major_version == 3:
+        minimal_version_supported = (3, 6)
 
     if version >= minimal_version_supported:
         return True