chore: clean up remaining python 3.9 support codes (#2486)

This change is cleaning up remaining Python 3.9 support codes.

Author: chelsea-lin

bigframes/series.py

@@ -448,7 +448,6 @@ def rename(
 
         # rename the Series name
         if isinstance(index, typing.Hashable):
-            # Python 3.9 doesn't allow isinstance of Optional
             index = typing.cast(Optional[str], index)
             block = self._block.with_column_labels([index])
 

notebooks/generative_ai/bq_dataframes_ml_drug_name_generation.ipynb

@@ -58,17 +58,6 @@
         "</table>"
       ]
     },
-    {
-      "cell_type": "markdown",
-      "metadata": {
-        "id": "24743cf4a1e1"
-      },
-      "source": [
-        "**_NOTE_**: This notebook has been tested in the following environment:\n",
-        "\n",
-        "* Python version = 3.9"
-      ]
-    },
     {
       "cell_type": "markdown",
       "metadata": {
@@ -1579,12 +1568,21 @@
       "provenance": []
     },
     "kernelspec": {
-      "display_name": "Python 3",
+      "display_name": "venv",
+      "language": "python",
       "name": "python3"
     },
     "language_info": {
+      "codemirror_mode": {
+        "name": "ipython",
+        "version": 3
+      },
+      "file_extension": ".py",
+      "mimetype": "text/x-python",
       "name": "python",
-      "version": "3.10.9"
+      "nbconvert_exporter": "python",
+      "pygments_lexer": "ipython3",
+      "version": "3.12.1"
     }
   },
   "nbformat": 4,

noxfile.py

@@ -56,7 +56,7 @@
 
 DEFAULT_PYTHON_VERSION = "3.14"
 
-UNIT_TEST_PYTHON_VERSIONS = ["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"]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     PYTEST_VERSION,
@@ -78,7 +78,7 @@
 # 3.10 is needed for Windows tests as it is the only version installed in the
 # bigframes-windows container image. For more information, search
 # bigframes/windows-docker, internally.
-SYSTEM_TEST_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+SYSTEM_TEST_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "jinja2",
     "mock",

samples/polars/noxfile.py

@@ -86,9 +86,8 @@ def get_pytest_env_vars() -> Dict[str, str]:
     return ret
 
 
-# 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"]

samples/snippets/noxfile.py

@@ -86,9 +86,8 @@ def get_pytest_env_vars() -> Dict[str, str]:
     return ret
 
 
-# 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"]

testing/constraints-3.10.txt

@@ -1,5 +1,4 @@
-# When we drop Python 3.9,
-# please keep these in sync with the minimum versions in setup.py
+# Please keep these in sync with the minimum versions in setup.py
 cloudpickle==2.0.0
 fsspec==2023.3.0
 gcsfs==2023.3.0