fix(retail): add region tag for Python - Update import user events from gcs

[rebeccaellis]

Description

Fixes #415382524

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

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• retail/interactive-tutorials/events/import_user_events_gcs.py:14, tag retail_import_user_events_from_gcs

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[gemini-code-assist]

Summary of Changes

Hello @rebeccaellis, 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 an issue by implementing standard region tags within the Python sample for importing user events from Google Cloud Storage. The primary goal is to enable proper documentation generation and code snippet extraction for this specific sample.

Highlights

• Documentation Tagging: I've added [START] and [END] region tags to the import_user_events_from_gcs.py sample. These tags are crucial for automatically extracting code snippets for documentation purposes, ensuring that the sample code presented in documentation is always up-to-date with the repository.

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[gemini-code-assist]

Code Review

This pull request adds region tags to the import_user_events_gcs.py sample. A review of the code revealed a critical bug in how the GCS bucket name is handled, where command-line arguments are ignored and the script can crash if an environment variable is not set.

[gemini-code-assist]

Using default=os.environ["EVENTS_BUCKET_NAME"] will raise a KeyError if the environment variable is not set. It's safer to use os.getenv() and handle the case where it might be None.