udim commented on a change in pull request #12009:
URL: https://github.com/apache/beam/pull/12009#discussion_r459180008
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File path: website/www/site/content/en/documentation/sdks/python-type-safety.md
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@@ -90,6 +91,15 @@ The following code declares an `int` input and a `str`
output type hint on the `
{{< code_sample
"sdks/python/apache_beam/examples/snippets/snippets_test_py3.py"
type_hints_map_annotations >}}
{{< /highlight >}}
+The following code demonstrates how to use annotations on `PTransform`
subclasses.
+A valid annotation is a `PCollection`, `PBegin`, or `PDone` that wraps an
internal (nested) type.
Review comment:
Please also accept `None` wherever `PDone` is accepted, so as to not
break existing pipelines.
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