pitrou commented on code in PR #37797:
URL: https://github.com/apache/arrow/pull/37797#discussion_r1339102230
##########
python/pyarrow/tests/test_cffi.py:
##########
@@ -411,3 +411,131 @@ def test_imported_batch_reader_error():
match="Expected to be able to read 16 bytes "
"for message body, got 8"):
reader_new.read_all()
+
+
[email protected]('obj', [pa.int32(), pa.field('foo', pa.int32()),
+ pa.schema({'foo': pa.int32()})],
+ ids=['type', 'field', 'schema'])
+def test_roundtrip_schema_capsule(obj):
+ gc.collect() # Make sure no Arrow data dangles in a ref cycle
+ old_allocated = pa.total_allocated_bytes()
+
+ capsule = obj.__arrow_c_schema__()
+ assert type(capsule).__name__ == "PyCapsule"
+ assert '"arrowschema"' in repr(capsule)
Review Comment:
Ah! Either we install it through pip, or you can just use `ctypes.pythonapi`
to access the PyCapsule APIs (but you need to declare their signatures
explicitly).
https://docs.python.org/3/library/ctypes.html#accessing-values-exported-from-dlls
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