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Make PyUnstable_Unicode_GET_CACHED_HASH return -1 on PyPy#157

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Merged
vstinner merged 2 commits intopython:mainfromencukou:uncached-hash-minus-one
Oct 15, 2025
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2 changes: 1 addition & 1 deletiondocs/api.rst
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Expand Up@@ -68,7 +68,7 @@ Python 3.15

See `PyUnstable_Unicode_GET_CACHED_HASH() documentation <https://docs.python.org/dev/c-api/unicode.html#c.PyUnstable_Unicode_GET_CACHED_HASH>`__.

Not available on PyPy.
On PyPy, always returns ``-1``.


Python 3.14
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7 changes: 5 additions & 2 deletionspythoncapi_compat.h
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Expand Up@@ -2572,11 +2572,14 @@ PyTuple_FromArray(PyObject *const *array, Py_ssize_t size)
#endif


#if PY_VERSION_HEX < 0x030F00A1 && !defined(PYPY_VERSION)
#if PY_VERSION_HEX < 0x030F00A1
static inline Py_hash_t
PyUnstable_Unicode_GET_CACHED_HASH(PyObject *op)
{
#if PY_VERSION_HEX >= 0x03000000
#ifdef PYPY_VERSION
(void)op; // unused argument
return -1;
#elif PY_VERSION_HEX >= 0x03000000
return ((PyASCIIObject*)op)->hash;
#else
return ((PyUnicodeObject*)op)->hash;
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4 changes: 3 additions & 1 deletiontests/test_pythoncapi_compat_cext.c
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Expand Up@@ -1611,8 +1611,10 @@ test_unicode(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
assert(PyErr_ExceptionMatches(PyExc_TypeError));
PyErr_Clear();

#ifndefPYPY_VERSION
// Test PyUnstable_Unicode_GET_CACHED_HASH()
#ifdefPYPY_VERSION
assert(PyUnstable_Unicode_GET_CACHED_HASH(abc)==-1);
#else
Py_hash_thash=PyObject_Hash(abc);
assert(hash!=-1);
assert(PyUnstable_Unicode_GET_CACHED_HASH(abc)==hash);
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