Modernize Python packaging/deprecation cleanup

setup.py

@@ -1,8 +1,6 @@
-import sys
-import codecs
 import setuptools
 
-from version import __version__ as version
+from ttrv.__version__ import __version__ as version
 
 
 install_requires = [
@@ -15,7 +13,7 @@ install_requires = [
 
 tests_require = [
     'coveralls',
-    'pytest>=3.1.0',  # Pinned for the ``pytest.param`` method
+    'pytest>=8.3.0',
     'coverage',
     'mock',
     'pylint',
@@ -26,20 +24,8 @@ extras_require = {
     'test': tests_require
 }
 
-# https://hynek.me/articles/conditional-python-dependencies/
-if int(setuptools.__version__.split(".", 1)[0]) < 18:
-    assert "bdist_wheel" not in sys.argv
-    if sys.version_info[0:2] < (3, 6):
-        install_requires.append("mailcap-fix")
-else:
-    # Building the bdist_wheel with conditional environment dependencies
-    # requires setuptools version > 18. For older setuptools versions this
-    # will raise an error.
-    extras_require.update({":python_version<'3.6'": ["mailcap-fix"]})
-
-
 def long_description():
-    with codecs.open('README.md', encoding='utf8') as f:
+    with open('README.md', encoding='utf8') as f:
         return f.read()
 
 
@@ -65,8 +51,8 @@ setuptools.setup(
     },
     data_files=[("share/man/man1", ["ttrv.1"])],
     install_requires=install_requires,
-    tests_require=tests_require,
     extras_require=extras_require,
+    python_requires='>=3.9',
     entry_points={'console_scripts': ['ttrv=ttrv.__main__:main']},
     classifiers=[
         'Intended Audience :: End Users/Desktop',
@@ -74,11 +60,13 @@ setuptools.setup(
         'Operating System :: MacOS :: MacOS X',
         'Operating System :: POSIX',
         'Natural Language :: English',
-        'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3',
+        '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',
+        'Programming Language :: Python :: 3.14',
         'Topic :: Terminals',
         'Topic :: Internet :: WWW/HTTP :: Dynamic Content :: Message Boards',
         'Topic :: Internet :: WWW/HTTP :: Dynamic Content :: News/Diary',