yuriy_levchenko added the comment:
because,
PyObject_GetAttr(PyObject *v, PyObject *name)
have this code
if (!PyString_Check(name)) {
and
PyDict_GetItem(PyObject *op, PyObject *key)
have this code
if (!PyString_CheckExact(key) ||
(hash = ((PyStringObject *) key)->ob_shash) == -1)
{
hash = PyObject_Hash(key);
next
lookdict_string(PyDictObject *mp, PyObject *key, register long hash)
if (!PyString_CheckExact(key)) {
#ifdef SHOW_CONVERSION_COUNTS
++converted;
#endif
mp->ma_lookup = lookdict;
return lookdict(mp, key, hash);
}
next
PyObject_RichCompare(PyObject *v, PyObject *w, int op)
and
try_rich_compare(PyObject *v, PyObject *w, int op)
we have this code
if ((f = RICHCOMPARE(v->ob_type)) != NULL) {
res = (*f)(v, w, op);
if (res != Py_NotImplemented)
return res;
Py_DECREF(res);
}
if ((f = RICHCOMPARE(w->ob_type)) != NULL) {
return (*f)(w, v, _Py_SwappedOp[op]);
}
v - PyStringObject
w - MyType
MyType have Py_TPFLAGS_HAVE_RICHCOMPARE and correct test with PyStringObject
but string_richcompare incorrect test type for object, and this code
a->ob_sval
may cause "access violation" and crach!
if i replace PyString_Check on PyString_CheckExact, all work fine and correct!
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<http://bugs.python.org/issue26421>
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