EnricoMi commented on code in PR #47339:
URL: https://github.com/apache/arrow/pull/47339#discussion_r2292779781


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python/pyarrow/_parquet_encryption.pyx:
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@@ -28,6 +28,12 @@ from pyarrow.lib cimport _Weakrefable
 from pyarrow.lib import tobytes, frombytes
 
 
+cdef extern from "Python.h":
+    # To let us get a PyObject* and avoid Cython auto-ref-counting
+    PyObject* PyBytes_FromStringAndSizeNative" PyBytes_FromStringAndSize"(
+        char *v, Py_ssize_t len) except NULL

Review Comment:
   Importing `PyBytes_FromStringAndSize` via `from cpython.bytes cimport 
PyBytes_FromStringAndSize` works.
   
   I have copied this from `io.pxi`, maybe it is  not needed there as well / 
any more:
   
https://github.com/apache/arrow/blob/cdc14591248fcd7f6b6aa8005885a2dc817c4ccb/python/pyarrow/io.pxi#L43-L46



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