jonathansudhakar1 commented on issue #18068:
URL: https://github.com/apache/beam/issues/18068#issuecomment-6690634626
Both parts of this seem to be done already, by #6670 ("[BEAM-1081]
Annotations custom message support and classes tests", merged 2018-10-17):
1. Custom messages: `annotate()` and `deprecated()` in
[`apache_beam/utils/annotations.py`](https://github.com/apache/beam/blob/d8eb82acf2c/sdks/python/apache_beam/utils/annotations.py)
take `custom_message`, with `%name%`, `%since%`, `%current%` and `%extra%`
placeholders.
2. Classes: the decorator patches `__new__` when the target is a class, so
creating an instance emits the warning. It also adds the deprecation notice to
the class docstring.
`annotations_test.py` covers both, for example `test_deprecated_with_class`
and the `custom_message` tests. It passes on master at d8eb82acf2c (10 passed).
Leaving this here in case it can be closed.
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