update version check to 3.8 - 3.12

gsutil.py

@@ -27,12 +27,12 @@
 # TODO: gsutil-beta: Distribute a pylint rc file.
 
 ver = sys.version_info
-if (ver.major == 2 and ver.minor < 7) or (ver.major == 3 and (ver.minor < 5 or ver.minor > 11)):
+if ver.major != 3 or ver.minor < 8 or ver.minor > 12:
   sys.exit(
-    "Error: gsutil requires Python version 2.7 or 3.5-3.11, but a different version is installed.\n"
+    "Error: gsutil requires Python version 3.8-3.12, but a different version is installed.\n"
     "You are currently running Python {}.{}\n"
     "Follow the steps below to resolve this issue:\n"
-    "\t1. Switch to Python 3.5-3.11 using your Python version manager or install an appropriate version.\n"
+    "\t1. Switch to Python 3.8-3.12 using your Python version manager or install an appropriate version.\n"
     "\t2. If you are unsure how to manage Python versions, visit [https://cloud.google.com/storage/docs/gsutil_install#specifications] for detailed instructions.".format(ver.major, ver.minor)
   )
 

setup.py

@@ -126,16 +126,16 @@ def make_release_tree(self, base_dir, files):
         'Natural Language :: English',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        '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',
         'Topic :: System :: Filesystems',
         'Topic :: Utilities',
     ],
-    # Gsutil supports Python 3.5+
-    python_requires='!=2.*, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4',
+    # Gsutil supports Python 3.8 to 3.12
+    python_requires='>=3.8, <=3.12',
     platforms='any',
     packages=find_packages(
         exclude=[