feat: add Python 3.14 to samples testing image

[parthea]

Similar to #12780

[gemini-code-assist]

Summary of Changes

Hello @parthea, 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 updates the .kokoro/docker/Dockerfile to incorporate Python 3.14.0 into the samples testing image. This enhancement ensures that the testing infrastructure is prepared for the latest Python release and benefits from updated patch versions for several other Python versions, thereby improving the robustness and currency of the test environment.

Highlights

• Python 3.14 Support: Added Python 3.14.0 to the list of Python versions installed and tested within the samples testing Docker image.
• Python Patch Version Updates: Updated the patch versions for several existing Python releases, including 3.9.23, 3.10.18, 3.11.13, 3.12.11, and 3.13.8, ensuring the testing environment uses more recent stable releases.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request updates the Python versions in the testing Docker image, adding support for Python 3.14 and refreshing patch versions for others. My feedback focuses on improving the readability and maintainability of the Dockerfile where these versions are listed.

[gemini-code-assist]

This list of Python versions is getting long and hard to read on a single line. To improve readability and maintainability, I suggest extracting the versions into a shell variable. This makes the list much easier to manage for future updates.

  && PYTHON_VERSIONS="\
    2.7.18 \
    3.7.17 \
    3.8.20 \
    3.9.23 \
    3.10.18 \
    3.11.13 \
    3.12.11 \
    3.13.8 \
    3.14.0" \
  && for PYTHON_VERSION in $PYTHON_VERSIONS; do \

[parthea]

Fixed in d92eb95

[vchudnov-g]

One small suggestion

[vchudnov-g]

I'd prefer to avoid variables that differ only by one letter. How about
for VERSION in $PYTHON_VERSIONS or for PYTHON_VERSION in $ALL_PYTHON_VERSIONS?