Drop support for Python 3.7, 3.8, and 3.9

Python 3.7, 3.8, and 3.9 have all reached end-of-life.

See https://devguide.python.org/versions/.

Author: SkypLabs

.github/workflows/test_and_publish.yml

@@ -4,7 +4,7 @@ on:
   push:
 
   pull_request:
-    branches: [ 'develop' ]
+    branches: ["develop"]
 
 jobs:
   is-duplicate:
@@ -31,7 +31,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - name: Check out code

setup.cfg

@@ -20,17 +20,14 @@ classifiers =
     Natural Language :: English
     Programming Language :: C
     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
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12
     Programming Language :: Python :: 3.13
     License :: OSI Approved :: GNU General Public License v3 (GPLv3)
 
 [options]
-python_requires = >=3.7, <4
+python_requires = >=3.10, <4
 
 [options.extras_require]
 examples =

tox.ini

@@ -9,9 +9,6 @@ isolated_build = true
 skip_missing_interpreters = true
 
 envlist =
-    py37
-    py38
-    py39
     py310
     py311
     py312