Review

Author: cdce8p

Doc/c-api/unicode.rst

@@ -1418,13 +1418,15 @@ They all return ``NULL`` or ``-1`` if an exception occurs.
    a 3-tuple containing the part before the separator, the separator itself,
    and the part after the separator. If the separator is not found,
    return a 3-tuple containing the string itself, followed by two empty strings.
+   *sep* must not be empty.
 
 
 .. c:function:: PyObject* PyUnicode_RPartition(PyObject *unicode, PyObject *sep)
 
    Similar to :c:func:`PyUnicode_Partition`, but split a Unicode string at the
    last occurrence of *sep*. If the separator is not found, return a 3-tuple
-   containing two empty strings, followed by the string itself.
+   containing two empty strings, followed by the string itself.  *sep* must
+   not be empty.
 
 
 .. c:function:: PyObject* PyUnicode_Join(PyObject *separator, PyObject *seq)

Misc/NEWS.d/next/Documentation/2025-02-16-14-57-00.gh-issue-46236.2HuS4S.rst

@@ -1,2 +1,2 @@
-Document :c:func:`PyUnicode_RSplit`, :c:func:`PyUnicode_Partition` and
+C API: Document :c:func:`PyUnicode_RSplit`, :c:func:`PyUnicode_Partition` and
 :c:func:`PyUnicode_RPartition`.