Drop Python 3.9, bump repo minimum to 3.10 (outside sdk/) (#46508)

* Initial plan

* Drop Python 3.9, bump minimum Python to 3.10 (outside sdk/)

Agent-Logs-Url: https://github.com/Azure/azure-sdk-for-python/sessions/6c92999a-fe77-4d48-9037-58f7bc2aea0a

Co-authored-by: msyyc <70930885+msyyc@users.noreply.github.com>

* Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update doc/dev/packaging.md

Co-authored-by: Scott Beddall <45376673+scbedd@users.noreply.github.com>

* Reconcile remaining Python 3.8 references in doc/dev/packaging.md

Agent-Logs-Url: https://github.com/Azure/azure-sdk-for-python/sessions/aa3aacbc-bb69-49ed-bf89-9bc2c3d4cb9d

Co-authored-by: msyyc <70930885+msyyc@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: msyyc <70930885+msyyc@users.noreply.github.com>
Co-authored-by: Scott Beddall <45376673+scbedd@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Yuchao Yan <yuchaoyan@microsoft.com>

Author: 4 people

.github/copilot-instructions.md

@@ -66,7 +66,7 @@ azpysdk pylint .
 - [MyPy fixing guide](https://github.com/Azure/azure-sdk-for-python/blob/main/doc/dev/static_type_checking_cheat_sheet.md)
 
 **REQUIREMENTS:**
-- Use Python 3.9 compatible environment
+- Use Python 3.10 compatible environment
 - Follow official fixing guidelines
 - Run `azpysdk mypy .` from the package directory
 

.github/skills/ml/fix-mypy/SKILL.md

@@ -65,7 +65,7 @@ Read the issue to understand which files/modules and specific error codes to fix
 # Activate the provided virtual environment (e.g., envml, env, venv)
 .\<venv-name>\Scripts\Activate.ps1
 
-# If creating new virtual environment (Python 3.9+):
+# If creating new virtual environment (Python 3.10+):
 python -m venv env
 .\env\Scripts\Activate.ps1
 ```
@@ -85,7 +85,7 @@ pip install -r dev_requirements.txt
 pip install -e .
 ```
 
-**Important:** Use Python 3.9 compatible environment for mypy checks.
+**Important:** Use Python 3.10 compatible environment for mypy checks.
 
 ### Step 3: Identify Target Files (within activated venv)
 
@@ -300,7 +300,7 @@ azpysdk mypy .
 
 - Always read the existing code to understand type annotation patterns before making changes
 - Prefer following existing patterns over adding new complex types
-- Use Python 3.9+ compatible type hints (use `Optional[X]` instead of `X | None`)
+- Use Python 3.10+ compatible type hints (use `Optional[X]` instead of `X | None`)
 - If unsure about a fix, mark it for manual review
 - Some errors may require architectural changes - don't force fixes
 - Test the code after fixing to ensure functionality is preserved

.github/workflows/copilot-setup-steps.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: '3.10'
           cache: 'pip'
 
       - name: Create and activate virtual environment

doc/dev/dataplane_generation.md

@@ -6,7 +6,7 @@ For more questions and general overview of the process, please refer to <https:/
 
 ## Prerequisites
 
-- Python 3.9 or later is required
+- Python 3.10 or later is required
   - [download for windows](https://www.python.org/downloads/windows/)
   - linux
     - sudo apt install python3

doc/dev/mgmt/generation.md

@@ -7,7 +7,7 @@ IMPORTANT NOTE: All the commands prefixed by `python` in this page assumes you h
 ### Prerequisites
 
 #### Setting Up Your Basic Environment
-- Python 3.9 or newer is required
+- Python 3.10 or newer is required
   - [Download for Windows](https://www.python.org/downloads/windows/)
   - For Linux:
     - Install Python 3 with `sudo apt install python3`

doc/dev/packaging.md

@@ -21,7 +21,7 @@ While this article provides an example using setup.py, this can also be achieved
 
 We want to build sdist and wheels in order to follow the following constraints:
 - Solution should work with *recent* versions of pip and setuptools (not the very latest only, but not archaeology either)
-- Wheels must work with Python 3.8+
+- Wheels must work with Python 3.10+
 - mixed dev installation and PyPI installation should be explicitly addressed
 
 # What do I do in my files to achieve that
@@ -59,7 +59,7 @@ The "packages" section MUST EXCLUDE the `azure` package. Example:
 
 Since the package is Python 3 only, you must notify it in the setup.py as well:
 ```python
-    python_requires=">=3.8",
+    python_requires=">=3.10",
 ```
 
 Example of a full setup.py
@@ -113,14 +113,12 @@ setup(
         'Programming Language :: Python',
         'Programming Language :: Python :: 3 :: Only',
         'Programming Language :: Python :: 3',
-        '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',
         'License :: OSI Approved :: MIT License',
     ],
-    python_requires=">=3.8",
+    python_requires=">=3.10",
     zip_safe=False,
     packages=find_packages(exclude=[
         'tests',
@@ -150,7 +148,7 @@ Since the package is Python 3 only, do NOT make this wheel universal. This usual
 - Remove "universal" from setup.cfg, or completely remove the file if it was the only option
 - In setup.py:
   - Remove `extra_requires`
-  - Add `python_requires=">=3.8",`
+  - Add `python_requires=">=3.10",`
   - Remove the Python 2 and 3.5/3.6 classifiers
   - Add classifier `Programming Language :: Python :: 3 :: Only`
   - Remove the "azure" check if applicable (see next note)

doc/dev/tests.md

@@ -30,11 +30,11 @@ testing infrastructure, and demonstrates how to write and run tests for a servic
 
 ## Set up your development environment
 
-The Azure SDK Python team creates libraries that are compatible with Python 3.8 and up. We walk through setting up a
-Python virtual environment for Python 3.8, but having a virtual environment for each minor version can make it
+The Azure SDK Python team creates libraries that are compatible with Python 3.10 and up. We walk through setting up a
+Python virtual environment for Python 3.10, but having a virtual environment for each minor version can make it
 easier to debug PRs locally.
 
-- Python 3.8+: Use the [python website](https://www.python.org/downloads/) or the one-click experience from the Windows store ([3.8](https://www.microsoft.com/p/python-38/9mssztt1n39l), [3.9](https://www.microsoft.com/p/python-39/9p7qfqmjrfp7), [3.10](https://www.microsoft.com/p/python-310/9pjpw5ldxlz5), [3.11](https://apps.microsoft.com/detail/9nrwmjp3717k?hl=en-us&gl=US), [3.12](https://apps.microsoft.com/detail/9ncvdn91xzqp?hl=en-us&gl=US)) (Windows only).
+- Python 3.10+: Use the [python website](https://www.python.org/downloads/) or the one-click experience from the Windows store ([3.10](https://www.microsoft.com/p/python-310/9pjpw5ldxlz5), [3.11](https://apps.microsoft.com/detail/9nrwmjp3717k?hl=en-us&gl=US), [3.12](https://apps.microsoft.com/detail/9ncvdn91xzqp?hl=en-us&gl=US)) (Windows only).
 
 
 ```cmd

doc/tool_usage_guide.md

@@ -64,7 +64,7 @@ To utilize this feature, add `--isolate` to any `azpysdk` invocation:
 ## Prerequisite
 
 - You need to have Python installed
-- The monorepo requires a minimum of `python 3.9`, but `>=3.11` is required for the `sphinx` check due to compatibility constraints with external processes.
+- The monorepo requires a minimum of `python 3.10`, but `>=3.11` is required for the `sphinx` check due to compatibility constraints with external processes.
 - You may optionally use the ["uv"](https://docs.astral.sh/uv/) tool, which is fast and handles Python version and venv creation automatically.
 
 ## Initial setup

eng/pipelines/autorest_checks.yml

@@ -15,7 +15,7 @@ pr:
 
 variables:
   NodeVersion: '18.x'
-  PythonVersion: '3.9'
+  PythonVersion: '3.10'
   auto_rest_clone_url: 'https://github.com/Azure/autorest.python.git'
   source_path_azure_core: 'sdk/core/azure-core'
   source_path_azure_mgmt_core: 'sdk/core/azure-mgmt-core'

eng/pipelines/templates/jobs/regression.yml

@@ -82,9 +82,9 @@ jobs:
           BuildTargetingString: ${{ parameters.BuildTargetingString }}
 
       - task: UsePythonVersion@0
-        displayName: 'Use Python 3.9'
+        displayName: 'Use Python 3.10'
         inputs:
-          versionSpec: '3.9'
+          versionSpec: '3.10'
 
       - template: /eng/pipelines/templates/steps/use-venv.yml