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only fast-path fromkeys() when the constructor returns a empty dict (closes #16345)

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This commit is contained in:
Benjamin Peterson 2012-10-31 14:05:55 -04:00
parent c43112823b
commit d1f2cb37a2
3 changed files with 45 additions and 33 deletions
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8
Lib/test/test_dict.py
View File

@ -254,6 +254,14 @@ class DictTest(unittest.TestCase):
d = dict(zip(range(6), range(6)))
self.assertEqual(dict.fromkeys(d, 0), dict(zip(range(6), [0]*6)))
class baddict3(dict):
def __new__(cls):
return d
d = {i : i for i in range(10)}
res = d.copy()
res.update(a=None, b=None, c=None)
self.assertEqual(baddict3.fromkeys({"a", "b", "c"}), res)
def test_copy(self):
d = {1:1, 2:2, 3:3}
self.assertEqual(d.copy(), {1:1, 2:2, 3:3})

3
Misc/NEWS
View File

@ -10,6 +10,9 @@ What's New in Python 3.2.4
Core and Builtins
-----------------
- Issue #16345: Fix an infinite loop when ``fromkeys`` on a dict subclass
recieved a nonempty dict from the constructor.
- Issue #16197: Update winreg docstrings and documentation to match code.
Patch by Zachary Ware.

67
Objects/dictobject.c
View File

@ -1335,49 +1335,50 @@ dict_fromkeys(PyObject *cls, PyObject *args)
if (d == NULL)
return NULL;
if (PyDict_CheckExact(d) && PyDict_CheckExact(seq)) {
PyDictObject *mp = (PyDictObject *)d;
PyObject *oldvalue;
Py_ssize_t pos = 0;
PyObject *key;
Py_hash_t hash;
if (PyDict_CheckExact(d) && PyDict_Size(d) == 0) {
if (PyDict_CheckExact(seq)) {
PyDictObject *mp = (PyDictObject *)d;
PyObject *oldvalue;
Py_ssize_t pos = 0;
PyObject *key;
Py_hash_t hash;
if (dictresize(mp, Py_SIZE(seq))) {
Py_DECREF(d);
return NULL;
}
while (_PyDict_Next(seq, &pos, &key, &oldvalue, &hash)) {
Py_INCREF(key);
Py_INCREF(value);
if (insertdict(mp, key, hash, value)) {
if (dictresize(mp, Py_SIZE(seq))) {
Py_DECREF(d);
return NULL;
}
while (_PyDict_Next(seq, &pos, &key, &oldvalue, &hash)) {
Py_INCREF(key);
Py_INCREF(value);
if (insertdict(mp, key, hash, value)) {
Py_DECREF(d);
return NULL;
}
}
return d;
}
return d;
}
if (PyAnySet_CheckExact(seq)) {
PyDictObject *mp = (PyDictObject *)d;
Py_ssize_t pos = 0;
PyObject *key;
Py_hash_t hash;
if (PyDict_CheckExact(d) && PyAnySet_CheckExact(seq)) {
PyDictObject *mp = (PyDictObject *)d;
Py_ssize_t pos = 0;
PyObject *key;
Py_hash_t hash;
if (dictresize(mp, PySet_GET_SIZE(seq))) {
Py_DECREF(d);
return NULL;
}
while (_PySet_NextEntry(seq, &pos, &key, &hash)) {
Py_INCREF(key);
Py_INCREF(value);
if (insertdict(mp, key, hash, value)) {
if (dictresize(mp, PySet_GET_SIZE(seq))) {
Py_DECREF(d);
return NULL;
}
while (_PySet_NextEntry(seq, &pos, &key, &hash)) {
Py_INCREF(key);
Py_INCREF(value);
if (insertdict(mp, key, hash, value)) {
Py_DECREF(d);
return NULL;
}
}
return d;
}
return d;
}
it = PyObject_GetIter(seq);