Fix test_get_python_sdk_name to use supported Python version

[shunping]

Update sys.version_info mock from 3.9 to 3.11 in test_get_python_sdk_name and format version check error message using sys.version_info for consistency.

This is needed to fix the failure of UtilTest::test_get_python_sdk_name on a post-release branch, where Beam version has no dev in it.

Failed test run:
https://github.com/apache/beam/actions/runs/29345736526/job/87128821341?pr=39325

Traceback:
(Notice that the error message is misleading though because it does not use the mocked variable. This has also been fixed in this PR)

______________________ UtilTest.test_get_python_sdk_name _______________________
[gw0] linux -- Python 3.10.20 /runner/_work/beam/beam/sdks/python/test-suites/tox/py310/build/srcs/sdks/python/target/.tox-py310-cloud/py310-cloud/bin/python

self = <apache_beam.runners.dataflow.internal.apiclient_test.UtilTest testMethod=test_get_python_sdk_name>

    @mock.patch(
        'apache_beam.runners.dataflow.internal.apiclient.sys.version_info',
        (3, 9))
    def test_get_python_sdk_name(self):
      pipeline_options = PipelineOptions([
          '--project',
          'test_project',
          '--job_name',
          'test_job_name',
          '--temp_location',
          'gs://test-location/temp',
          '--experiments',
          'beam_fn_api',
          '--experiments',
          'use_multiple_sdk_containers'
      ])
>     environment = apiclient.Environment([],
                                          pipeline_options,
                                          '1',
                                          FAKE_PIPELINE_URL)

apache_beam/runners/dataflow/internal/apiclient_test.py:1049: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
target/.tox-py310-cloud/py310-cloud/lib/python3.10/site-packages/apache_beam/runners/dataflow/internal/apiclient.py:139: in __init__
    _verify_interpreter_version_is_supported(options)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

pipeline_options = <apache_beam.options.pipeline_options.PipelineOptions object at 0x7dac1838b160>

    def _verify_interpreter_version_is_supported(pipeline_options):
      if ('%s.%s' % (sys.version_info[0], sys.version_info[1])
          in _PYTHON_VERSIONS_SUPPORTED_BY_DATAFLOW):
        return
    
      if 'dev' in beam_version.__version__:
        return
    
      debug_options = pipeline_options.view_as(DebugOptions)
      if (debug_options.experiments and
          'use_unsupported_python_version' in debug_options.experiments):
        return
    
>     raise Exception(
          'Dataflow runner currently supports Python versions %s, got %s.\n'
          'To ignore this requirement and start a job '
          'using an unsupported version of Python interpreter, pass '
          '--experiment use_unsupported_python_version pipeline option.' %
          (_PYTHON_VERSIONS_SUPPORTED_BY_DATAFLOW, sys.version))
E     Exception: Dataflow runner currently supports Python versions ['3.10', '3.11', '3.12', '3.13', '3.14'], got 3.10.20 (main, Jun 16 2026, 21:01:32) [GCC 13.3.0].
E     To ignore this requirement and start a job using an unsupported version of Python interpreter, pass --experiment use_unsupported_python_version pipeline option.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a test failure in the Dataflow runner's interpreter version verification logic. By updating the mocked Python version in the test suite and refining the error message format, the changes ensure that the verification logic behaves correctly and provides clearer feedback when an unsupported Python version is encountered.

Highlights

• Test Compatibility: Updated the sys.version_info mock in test_get_python_sdk_name from 3.9 to 3.11 to align with supported Python versions and resolve test failures.
• Error Reporting: Improved the error message in _verify_interpreter_version_is_supported to use sys.version_info for more accurate and consistent reporting of the detected Python version.

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[gemini-code-assist]

Code Review

This pull request updates the unsupported Python version exception message in the Dataflow runner's API client to display only the major and minor version numbers using sys.version_info instead of the full sys.version string. Additionally, it updates a corresponding unit test to mock Python 3.11 instead of Python 3.9. There are no review comments, so no feedback is provided.

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[github-actions]

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R: @damccorm for label python.

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