Add support for Python 3.10 and drop EOL 3.5 (#167)

* Add support for Python 3.10

* Remove Trove classifiers for dropped versions

* Remove redundant setup.cfg: no need for universal wheels for Python 3-only, setuptools and wheel auto-find LICENSE files

* Added Required Python Version

Added python_requires to specify the required python version for the library.

* Updated required python version

* Drop support for EOL Python 3.5

* Upgrade Python syntax with pyupgrade --py36-plus

Co-authored-by: Nirjas Jakilim <Nirzak@users.noreply.github.com>

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
 
     steps:
     - uses: actions/checkout@v2
@@ -33,7 +33,7 @@ jobs:
     - name: Install test dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install pytest
+        python -m pip install pytest
     - name: Test with pytest
       run: |
         pytest

certifi/core.py

@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-
 """
 certifi.py
 ~~~~~~~~~~
@@ -55,7 +53,7 @@ def read_text(
         encoding: str = 'utf-8',
         errors: str = 'strict'
     ) -> str:
-        with open(where(), "r", encoding=encoding) as data:
+        with open(where(), encoding=encoding) as data:
             return data.read()
 
     # If we don't have importlib.resources, then we will just do the old logic

certifi/tests/test_certify.py

@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-
 import os
 import unittest
 

setup.py

@@ -1,6 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
-from __future__ import with_statement
 import re
 import os
 import sys
@@ -18,7 +16,7 @@
 
 
 version_regex = r'__version__ = ["\']([^"\']*)["\']'
-with open('certifi/__init__.py', 'r') as f:
+with open('certifi/__init__.py') as f:
     text = f.read()
     match = re.search(version_regex, text)
 
@@ -48,19 +46,19 @@
     include_package_data=True,
     zip_safe=False,
     license='MPL-2.0',
-    python_requires=">=3.5",
+    python_requires=">=3.6",
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)',
         'Natural Language :: English',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
     ],
     project_urls={
         'Source': 'https://github.com/certifi/python-certifi',