chore: remove python 3.9 support. (googleapis#1748)

chore: remove python 3.9 support. 

Details in b/483015736

Author: chandra-siri

.github/sync-repo-settings.yaml

@@ -10,5 +10,5 @@ branchProtectionRules:
     - 'Kokoro'
     - 'cla/google'
     - 'Kokoro system-3.14'
-    - 'Kokoro system-3.9'
+    - 'Kokoro system-3.10'
     - 'OwlBot Post Processor'

.kokoro/presubmit/system-3.9.cfg .kokoro/presubmit/system-3.10.cfg.kokoro/presubmit/system-3.9.cfg renamed to .kokoro/presubmit/system-3.10.cfg

@@ -3,7 +3,7 @@
 # Only run this nox session.
 env_vars: {
     key: "NOX_SESSION"
-    value: "system-3.9"
+    value: "system-3.10"
 }
 
 # Credentials needed to test universe domain.

.librarian/generator-input/noxfile.py

@@ -27,8 +27,8 @@
 BLACK_PATHS = ["docs", "google", "tests", "noxfile.py", "setup.py"]
 
 DEFAULT_PYTHON_VERSION = "3.14"
-SYSTEM_TEST_PYTHON_VERSIONS = ["3.9", "3.14"]
-UNIT_TEST_PYTHON_VERSIONS = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+SYSTEM_TEST_PYTHON_VERSIONS = ["3.10", "3.14"]
+UNIT_TEST_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]
 CONFORMANCE_TEST_PYTHON_VERSIONS = ["3.12"]
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
@@ -44,9 +44,6 @@
     "lint",
     "lint_setup_py",
     "system",
-    # TODO(https://github.com/googleapis/python-storage/issues/1499):
-    # Remove or restore testing for Python 3.7/3.8
-    "unit-3.9",
     "unit-3.10",
     "unit-3.11",
     "unit-3.12",

.librarian/generator-input/setup.py

@@ -87,9 +87,6 @@
         "License :: OSI Approved :: Apache Software License",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "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",

noxfile.py

@@ -17,7 +17,6 @@
 from __future__ import absolute_import
 import os
 import pathlib
-import re
 import shutil
 
 import nox
@@ -27,9 +26,8 @@
 BLACK_PATHS = ["docs", "google", "tests", "noxfile.py", "setup.py"]
 
 DEFAULT_PYTHON_VERSION = "3.14"
-SYSTEM_TEST_PYTHON_VERSIONS = ["3.9", "3.14"]
+SYSTEM_TEST_PYTHON_VERSIONS = ["3.10", "3.14"]
 UNIT_TEST_PYTHON_VERSIONS = [
-    "3.9",
     "3.10",
     "3.11",
     "3.12",
@@ -51,9 +49,6 @@
     "lint",
     "lint_setup_py",
     "system",
-    # TODO(https://github.com/googleapis/python-storage/issues/1499):
-    # Remove or restore testing for Python 3.7/3.8
-    "unit-3.9",
     "unit-3.10",
     "unit-3.11",
     "unit-3.12",

setup.py

@@ -99,9 +99,6 @@
         "License :: OSI Approved :: Apache Software License",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "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",
@@ -114,7 +111,7 @@
     packages=packages,
     install_requires=dependencies,
     extras_require=extras,
-    python_requires=">=3.7",
+    python_requires=">=3.10",
     include_package_data=True,
     zip_safe=False,
 )