Remove support for Python 2.7 and 3.5

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
           - macos-latest  # macOS-10.15
           - windows-2016
           - windows-latest  # windows-2019
-        python-version: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9, pypy-2.7, pypy-3.6, pypy-3.7]
+        python-version: [3.6, 3.7, 3.8, 3.9, pypy-3.6, pypy-3.7]
 
     steps:
     - uses: actions/checkout@v1

setup.cfg

@@ -24,10 +24,8 @@ classifiers =
     Topic :: Software Development :: Testing
     Topic :: Software Development :: Libraries
     Topic :: Utilities
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
+    Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
@@ -40,14 +38,11 @@ packages = find:
 package_dir =
   =src
 zip_safe = True
-python_requires = >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*
+python_requires = >=3.6
 install_requires =
     tox >=3.12, <4
-    typing; python_version<"3.5"
 setup_requires =
-    # This is for backward compatibility
-    # Needs setuptools_scm v5 for Python <3.6
-    setuptools_scm[toml] >=5, <7
+    setuptools_scm[toml] >=6, <7
 
 [options.packages.find]
 where = src
@@ -58,12 +53,12 @@ tox =
 
 [options.extras_require]
 testing =
-    black; platform_python_implementation=='CPython' and python_version>='3.6'
+    black
     flake8 >=3, <4
     pytest >=4, <6
     pytest-cov >=2, <3
     pytest-mock >=2, <3
-    pytest-randomly >=3; python_version>='3.5'
+    pytest-randomly >=3
 
 [options.package_data]
 tox_gh_actions =
@@ -79,12 +74,10 @@ skip_missing_interpreters = true
 envlist =
     black
     flake8
-    {py27,py35,py36,py37,py38,py39,pypy2,pypy3}-tox{312,315,latest}
+    {py36,py37,py38,py39,pypy2,pypy3}-tox{312,315,latest}
 
 [gh-actions]
 python =
-    2.7: py27, flake8
-    3.5: py35
     3.6: py36
     3.7: py37
     3.8: py38, black, flake8