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bpo-31572: Silence only AttributeError when get the __copy__ attribute in itertools.tee(). (#3724)

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Serhiy Storchaka 2017-11-11 15:51:42 +02:00 committed by GitHub
parent d4f8480dfe
commit 1707e4020f
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 25 additions and 7 deletions
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32
Modules/itertoolsmodule.c
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@ -810,7 +810,7 @@ static PyObject *
tee(PyObject *self, PyObject *args)
{
Py_ssize_t i, n=2;
PyObject *it, *iterable, *copyable, *result;
PyObject *it, *iterable, *copyable, *copyfunc, *result;
_Py_IDENTIFIER(__copy__);
if (!PyArg_ParseTuple(args, "O|n", &iterable, &n))
@ -829,25 +829,43 @@ tee(PyObject *self, PyObject *args)
Py_DECREF(result);
return NULL;
}
if (!_PyObject_HasAttrId(it, &PyId___copy__)) {
copyfunc = _PyObject_GetAttrId(it, &PyId___copy__);
if (copyfunc != NULL) {
copyable = it;
}
else if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
Py_DECREF(it);
Py_DECREF(result);
return NULL;
}
else {
PyErr_Clear();
copyable = tee_fromiterable(it);
Py_DECREF(it);
if (copyable == NULL) {
Py_DECREF(result);
return NULL;
}
} else
copyable = it;
PyTuple_SET_ITEM(result, 0, copyable);
for (i=1 ; i<n ; i++) {
copyfunc = _PyObject_GetAttrId(copyable, &PyId___copy__);
if (copyfunc == NULL) {
Py_DECREF(copyable);
Py_DECREF(result);
return NULL;
}
}
copyable = _PyObject_CallMethodId(copyable, &PyId___copy__, NULL);
PyTuple_SET_ITEM(result, 0, copyable);
for (i = 1; i < n; i++) {
copyable = _PyObject_CallNoArg(copyfunc);
if (copyable == NULL) {
Py_DECREF(copyfunc);
Py_DECREF(result);
return NULL;
}
PyTuple_SET_ITEM(result, i, copyable);
}
Py_DECREF(copyfunc);
return result;
}