[Feature Request]: Move LogElements transform to Beam Transforms

[tvalentyn]

What would you like to happen?

People are re-implementing LogElements and asking about similar things on stackoverflow.

https://github.com/apache/beam/blob/master/learning/katas/python/log_elements.py

The LogElements is currently used in the educational tools (Katas, Playground) and not part of the official Beam API.

apache_beam/transforms or apache_beam/transforms/util.py may be a better home for it.

Issue Priority

Priority: 2

Issue Component

Component: sdk-py-core

[sreenath-tm]

I'm interested in contributing to this issue, so before I start working it, would you mind sparing your time explaining what the fix will be like and pointing me to some resources to get started.

[tvalentyn]

Hi @sreenath-tm . Thanks for considering contributing to Beam! You can take a look at https://beam.apache.org/contribute/get-started-contributing/ and s.apache.org/beam-python-dev-wiki to get started.

The fix looks like this: the transform code in https://github.com/apache/beam/blob/master/learning/katas/python/log_elements.py ,
is moved into https://github.com/apache/beam/blob/master/sdks/python/apache_beam/transforms/util.py any references to this code are updated.

Bonus: add a unit test that exercises the transform.