GH-35531: [Python] C Data Interface PyCapsule Protocol (#37797)

### Rationale for this change ### What changes are included in this PR? * A new specification for Arrow PyCapsules and related dunder methods * Implementing the dunder methods for `DataType`, `Field`, `Schema`, `Array`, `RecordBatch`, `Table`, and `RecordBatchReader`. ### Are these changes tested? Yes, I've added various roundtrip tests for each of the types. ### Are there any user-facing changes? This introduces some new APIs and documents them. * Closes: #34031 * Closes: #35531 Authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com> Signed-off-by: Antoine Pitrou <antoine@python.org>
apache · Oct 18, 2023 · d68f8e2 · d68f8e2
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diff --git a/docs/source/format/CDataInterface.rst b/docs/source/format/CDataInterface.rst
@@ -990,3 +990,14 @@ adaptation cost.
 
 
 .. _Python buffer protocol: https://www.python.org/dev/peps/pep-3118/
+
+Language-specific protocols
+===========================
+
+Some languages may define additional protocols on top of the Arrow C data
+interface.
+
+.. toctree::
+   :maxdepth: 1
+
+   CDataInterface/PyCapsuleInterface