Bind copyability of schema types

[ggould-tri]

This change is 

[ggould-tri]

+(release notes: yes)
+@jwnimmer-tri is this the correct idiom?

Reviewable status: LGTM missing from assignee jwnimmer-tri(platform), needs at least two assigned reviewers (waiting on @jwnimmer-tri)

[jwnimmer-tri]

Yup!

both.

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: 1 unresolved discussion, needs at least two assigned reviewers (waiting on @ggould-tri)

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bindings/pydrake/common/test/schema_test.py, line 15 at r1 (raw file):

        self.assertIsInstance(dut, mut.Distribution)
        copy.copy(dut)
        copy.deepcopy(dut)

This code is slightly at odds with this helper method's docstring.

The abstract base class's "base methods" do not offer any help for copy-ability. However, we expect that all concrete subclasses must be copyable. Changing the docstring to clarify this should suffice.

Ditto for similar docstrings, throughout.

[ggould-tri]

Reviewable status: 1 unresolved discussion, needs at least two assigned reviewers (waiting on @jwnimmer-tri)

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bindings/pydrake/common/test/schema_test.py, line 15 at r1 (raw file):

Previously, jwnimmer-tri (Jeremy Nimmer) wrote…

This code is slightly at odds with this helper method's docstring.

The abstract base class's "base methods" do not offer any help for copy-ability. However, we expect that all concrete subclasses must be copyable. Changing the docstring to clarify this should suffice.

Ditto for similar docstrings, throughout.

Done.

[jwnimmer-tri]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: needs at least two assigned reviewers (waiting on @ggould-tri)

[ggould-tri]

+(status: single reviewer ok)

Reviewable status: complete! all discussions resolved, LGTM from assignee jwnimmer-tri(platform) (waiting on @ggould-tri)