build: comprehensive removal of Python 3.9 support

Author: aseering

.librarian/generator-input/librarian.py

@@ -210,7 +210,7 @@
     split_system_tests=True,
     system_test_extras=["tracing"],
     system_test_python_versions=["3.12"],
-    unit_test_python_versions=["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+    unit_test_python_versions=["3.10", "3.11", "3.12", "3.13", "3.14"]
 )
 s.move(
     templated_files,

.librarian/generator-input/noxfile.py

@@ -32,13 +32,12 @@
 ISORT_VERSION = "isort==5.11.0"
 LINT_PATHS = ["google", "tests", "noxfile.py", "setup.py"]
 
-DEFAULT_PYTHON_VERSION = "3.14"
+DEFAULT_PYTHON_VERSION = "3.10"
 
 DEFAULT_MOCK_SERVER_TESTS_PYTHON_VERSION = "3.12"
 SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.14"]
 
 UNIT_TEST_PYTHON_VERSIONS: List[str] = [
-    "3.9",
     "3.10",
     "3.11",
     "3.12",

.librarian/generator-input/setup.py

@@ -83,7 +83,6 @@
         "License :: OSI Approved :: Apache Software License",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
@@ -95,7 +94,7 @@
     packages=packages,
     install_requires=dependencies,
     extras_require=extras,
-    python_requires=">=3.9",
+    python_requires=">=3.10",
     include_package_data=True,
     zip_safe=False,
 )

.librarian/state.yaml

@@ -38,8 +38,7 @@ libraries:
       - ^scripts/fixup_
       - ^setup.py
       - ^testing/constraints-3.8
-      - ^testing/constraints-3.9
-      - ^testing/constraints-3.1
+      - ^testing/constraints-3.10
       - ^docs/conf.py
       - ^docs/_static
       - ^docs/spanner_v1/types_.rst

noxfile.py

@@ -36,10 +36,16 @@
 ISORT_VERSION = "isort==5.11.0"
 LINT_PATHS = ["google", "tests", "noxfile.py", "setup.py"]
 
-DEFAULT_PYTHON_VERSION = "3.14"
+DEFAULT_PYTHON_VERSION = "3.10"
 
 DEFAULT_MOCK_SERVER_TESTS_PYTHON_VERSION = "3.12"
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.14"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = [
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+    "3.14",
+]
 
 UNIT_TEST_PYTHON_VERSIONS: List[str] = [
     "3.10",

samples/samples/noxfile.py

@@ -89,7 +89,7 @@ def get_pytest_env_vars() -> Dict[str, str]:
 
 # DO NOT EDIT - automatically generated.
 # All versions used to test samples.
-ALL_VERSIONS = ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+ALL_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
 # Any default versions that should be ignored.
 IGNORED_VERSIONS = TEST_CONFIG["ignored_versions"]