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SF bug #793826: using itertools.izip to mutate tuples

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Avoid Armin Rigo's dastardly exercise in re-entrancy.
This commit is contained in:
Raymond Hettinger 2003-08-29 23:09:58 +00:00
parent b738041c5d
commit a56f6b6600
2 changed files with 36 additions and 3 deletions
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6
Modules/itertoolsmodule.c
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@ -1595,16 +1595,18 @@ izip_next(izipobject *lz)
if (tuplesize == 0)
return NULL;
if (result->ob_refcnt == 1) {
Py_INCREF(result);
for (i=0 ; i < tuplesize ; i++) {
it = PyTuple_GET_ITEM(lz->ittuple, i);
assert(PyIter_Check(it));
item = (*it->ob_type->tp_iternext)(it);
if (item == NULL)
if (item == NULL) {
Py_DECREF(result);
return NULL;
}
Py_DECREF(PyTuple_GET_ITEM(result, i));
PyTuple_SET_ITEM(result, i, item);
}
Py_INCREF(result);
} else {
result = PyTuple_New(tuplesize);
if (result == NULL)