chore(appengine) Remove deprecated samples directory

[XrossFox]

Description

Removal of appengine/flexible_python37_and_earlier path for deprecation.

b/475332253

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[gemini-code-assist]

Summary of Changes

Hello @XrossFox, 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 completes the final step in a deprecation process by removing all sample code and associated configuration files that supported Python 3.7 and earlier versions within the App Engine flexible environment. These samples were identified as no longer being used, and their removal simplifies the codebase and focuses resources on currently supported environments.

Highlights

• Deprecation Cleanup: Removed all samples located under the appengine/flexible_python37_and_earlier path, as they are no longer in use and have been officially deprecated.
• Codebase Simplification: Streamlined the repository by eliminating outdated Python 3.7 and earlier App Engine flexible environment examples, reducing maintenance overhead.

Changelog

• appengine/flexible_python37_and_earlier/
  • Removed README.md
• appengine/flexible_python37_and_earlier/analytics/
  • Removed README.md
  • Removed app.yaml
  • Removed main.py
  • Removed main_test.py
  • Removed noxfile_config.py
  • Removed requirements-test.txt
  • Removed requirements.txt
• appengine/flexible_python37_and_earlier/hello_world/
  • Removed app.yaml
  • Removed main.py
  • Removed main_test.py
  • Removed noxfile_config.py
  • Removed requirements-test.txt
  • Removed requirements.txt
• appengine/flexible_python37_and_earlier/hello_world_django/
  • Removed .gitignore
  • Removed README.md
  • Removed app.yaml
  • Removed helloworld/views.py
  • Removed manage.py
  • Removed noxfile_config.py
  • Removed project_name/settings.py
  • Removed project_name/urls.py
  • Removed project_name/wsgi.py
  • Removed requirements-test.txt
  • Removed requirements.txt
• appengine/flexible_python37_and_earlier/metadata/
  • Removed app.yaml
  • Removed main.py
  • Removed main_test.py
  • Removed noxfile_config.py
  • Removed requirements-test.txt
  • Removed requirements.txt
• appengine/flexible_python37_and_earlier/multiple_services/
  • Removed README.md
• appengine/flexible_python37_and_earlier/multiple_services/gateway-service/
  • Removed app.yaml
  • Removed main.py
  • Removed requirements-test.txt
  • Removed requirements.txt
  • Removed services_config.py
• appengine/flexible_python37_and_earlier/multiple_services/static-service/
  • Removed app.yaml
  • Removed main.py
  • Removed requirements-test.txt
  • Removed requirements.txt
  • Removed static/index.html
  • Removed static/index.js
  • Removed static/style.css
• appengine/flexible_python37_and_earlier/numpy/
  • Removed app.yaml
  • Removed main.py
  • Removed main_test.py
  • Removed noxfile_config.py
  • Removed requirements-test.txt
  • Removed requirements.txt
• appengine/flexible_python37_and_earlier/pubsub/
  • Removed README.md
  • Removed app.yaml
  • Removed main.py
  • Removed main_test.py
  • Removed noxfile_config.py
  • Removed requirements-test.txt
  • Removed requirements.txt
  • Removed sample_message.json
  • Removed templates/index.html
• appengine/flexible_python37_and_earlier/scipy/
  • Removed .gitignore
  • Removed README.md
  • Removed app.yaml
  • Removed main.py
  • Removed main_test.py
  • Removed noxfile_config.py
  • Removed requirements-test.txt
  • Removed requirements.txt
• appengine/flexible_python37_and_earlier/static_files/
  • Removed README.md
  • Removed app.yaml
  • Removed main.py
  • Removed main_test.py
  • Removed noxfile_config.py
  • Removed requirements-test.txt
  • Removed requirements.txt
  • Removed static/main.css
  • Removed templates/index.html
• appengine/flexible_python37_and_earlier/twilio/
  • Removed README.md
  • Removed app.yaml
  • Removed main.py
  • Removed main_test.py
  • Removed noxfile_config.py
  • Removed requirements-test.txt
  • Removed requirements.txt

Activity

• The pull request aims to remove deprecated samples from the appengine/flexible_python37_and_earlier path.
• The author confirmed that no samples are currently using these deprecated code snippets.
• This change is the final step in a series of previous tasks related to this deprecation, tracked by b/475332253.

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[gemini-code-assist]

Code Review

This pull request removes the deprecated samples located in the appengine/flexible_python37_and_earlier directory. The changes are straightforward and align with the goal of removing outdated code. This is a good cleanup task.

I noticed that appengine/flexible/README.md still contains a reference to the deleted directory on lines 10-11. This will result in a broken link. I recommend creating a follow-up pull request to remove this reference.

The file deletions in this PR are correct.

[snippet-bot]

Here is the summary of changes.

You are about to delete 13 region tags.

• appengine/flexible_python37_and_earlier/analytics/app.yaml:22, tag gae_flex_analytics_env_variables
• appengine/flexible_python37_and_earlier/analytics/main.py:15, tag gae_flex_analytics_track_event
• appengine/flexible_python37_and_earlier/hello_world/main.py:15, tag gae_flex_quickstart
• appengine/flexible_python37_and_earlier/metadata/main.py:25, tag gae_flex_metadata
• appengine/flexible_python37_and_earlier/pubsub/app.yaml:22, tag gae_flex_pubsub_env
• appengine/flexible_python37_and_earlier/pubsub/main.py:42, tag gae_flex_pubsub_index
• appengine/flexible_python37_and_earlier/pubsub/main.py:63, tag gae_flex_pubsub_push
• appengine/flexible_python37_and_earlier/static_files/main.py:15, tag gae_flex_python_static_files
• appengine/flexible_python37_and_earlier/static_files/static/main.css:16, tag gae_flex_python_css
• appengine/flexible_python37_and_earlier/twilio/app.yaml:22, tag gae_flex_twilio_env
• appengine/flexible_python37_and_earlier/twilio/main.py:31, tag gae_flex_twilio_receive_call
• appengine/flexible_python37_and_earlier/twilio/main.py:43, tag gae_flex_twilio_send_sms
• appengine/flexible_python37_and_earlier/twilio/main.py:62, tag gae_flex_twilio_receive_sms

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