Update setup.py to support Python 3.6 and above

- Removed support for older Python versions (2.6, 2.7, 3.5) and updated the Python requirement to '>=3.6' to ensure compatibility with modern Python features.

Author: terryyin

setup.py

@@ -84,9 +84,8 @@ def run():
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 2.6',
-        'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.6',
         'Programming Language :: Python',
         'Topic :: Education',
     ],
@@ -102,6 +101,7 @@ def run():
     long_description=long_description,
     name='translate',
     packages=find_packages(exclude=['docs', 'tests', 'tests.*', 'requirements']),
+    python_requires='>=3.6',
     setup_requires=['pytest-runner'],
     tests_require=tests_requirements,
     url='https://github.com/terryyin/google-translate-python',

tests/test_setup.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+# encoding: utf-8
+import importlib.util
+import os
+from unittest import mock
+
+
+def _load_setup_module():
+    root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+    setup_path = os.path.join(root, 'setup.py')
+    spec = importlib.util.spec_from_file_location('project_setup', setup_path)
+    setup_module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(setup_module)
+    return setup_module
+
+
+def test_setup_declares_python_36_minimum():
+    captured = {}
+
+    def fake_setup(**kwargs):
+        captured.update(kwargs)
+
+    setup_module = _load_setup_module()
+    with mock.patch.object(setup_module, 'setup', side_effect=fake_setup), \
+         mock.patch.object(setup_module, 'save_version'):
+        setup_module.run()
+
+    assert captured.get('python_requires') == '>=3.6'
+
+    classifiers = captured.get('classifiers', [])
+    stale = {
+        'Programming Language :: Python :: 2.6',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3.5',
+    }
+    assert not stale.intersection(classifiers)
+    assert 'Programming Language :: Python :: 3.6' in classifiers