Drop support for Python 3.7 (#413)

The tox environment was well behind and has been updated too.

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
     needs: [lint]
     strategy:
       matrix:
-        pyver: ['3.7', '3.8', '3.9', '3.10', '3.11']
+        pyver: ['3.8', '3.9', '3.10', '3.11']
         os: [ubuntu, macos, windows]
       fail-fast: false
     runs-on: ${{ matrix.os }}-latest

CHANGES/413.removal

@@ -0,0 +1 @@
+Dropped Python 3.7 support.

setup.cfg

@@ -24,7 +24,6 @@ classifiers =
   Programming Language :: Python
   Programming Language :: Python :: 3
   Programming Language :: Python :: 3 :: Only
-  Programming Language :: Python :: 3.7
   Programming Language :: Python :: 3.8
   Programming Language :: Python :: 3.9
   Programming Language :: Python :: 3.10
@@ -37,7 +36,7 @@ classifiers =
   Framework :: AsyncIO
 
 [options]
-python_requires = >=3.7
+python_requires = >=3.8
 packages = find:
 include_package_data = True
 

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 
-envlist = check, clean, {py36,py37,py38}-{debug,release}, report
+envlist = check, clean, {py38,py39,py310,py311}-{debug,release}, report
 
 [testenv]
 
@@ -19,11 +19,6 @@ commands =
 setenv =
     debug: PYTHONASYNCIODEBUG = 1
 
-basepython:
-    py36: python3.6
-    py37: python3.7
-    py38: python3.8
-
 [testenv:check]
 
 deps =
@@ -37,7 +32,7 @@ commands =
     python setup.py check -rms
 
 basepython:
-    python3.7
+    python3.10
 
 [testenv:clean]
 
@@ -48,7 +43,7 @@ commands =
     coverage erase
 
 basepython:
-    python3.7
+    python3.10
 
 [testenv:report]
 
@@ -64,4 +59,4 @@ whitelist_externals =
     echo
 
 basepython:
-    python3.7
+    python3.10