Add Python example for schema transforms (field selection)

[Midhat-kazmi]

Adds Python example for selecting nested fields in Schema Transforms section (6.6) to match Java documentation.

[gemini-code-assist]

Summary of Changes

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This pull request improves the Apache Beam programming guide by integrating a practical Python example for schema transforms, specifically focusing on selecting nested fields. This update ensures consistency with the existing Java documentation and provides Python users with a direct, runnable code snippet to understand and implement this functionality.

Highlights

• Documentation Update: Replaced a Java code snippet with a Python example in the "Schema Transforms (field selection)" section of the programming guide.
• Python Example Added: Introduced a clear Python example demonstrating how to select nested fields (e.g., shippingAddress.postCode) using apache_beam.Select and a lambda function.
• Code Cleanup: Removed a previously commented-out, less idiomatic Python example, streamlining the documentation.

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Changelog

• website/www/site/content/en/documentation/programming-guide.md
  • Replaced the Java code block for selecting nested fields with a new Python code block.
  • The new Python example demonstrates beam.Select for extracting shippingAddress.postCode.
  • Removed a commented-out Python example that was previously present.

Activity

• The pull request was opened by Midhat-kazmi with the stated goal of adding a Python example for schema transforms (field selection) to match Java documentation.
• No further review comments or activities have been recorded in the provided context.

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[github-actions]

Assigning reviewers:

R: @kennknowles for label website.

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[kennknowles]

Looks like you've deleted the Java. We want both.

[Midhat-kazmi]

Thanks for catching that, sorry about that! I’ll restore the Java example and add Python alongside it.

[Midhat-kazmi]

I’ve restored the Java example and added the Python example alongside it, please let me know if everything looks good now.