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gh-60203: Revert changes in cycle.__setstate__ #99982

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Dec 5, 2022
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gh-60203: Revert changes in cycle.__setstate__ #99982

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36 changes: 36 additions & 0 deletions Lib/test/test_itertools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -675,6 +675,7 @@ def test_cycle(self):
self.assertRaises(TypeError, cycle, 5)
self.assertEqual(list(islice(cycle(gen3()),10)), [0,1,2,0,1,2,0,1,2,0])

def test_cycle_copy_pickle(self):
# check copy, deepcopy, pickle
c = cycle('abc')
self.assertEqual(next(c), 'a')
Expand Down Expand Up @@ -710,6 +711,37 @@ def test_cycle(self):
d = pickle.loads(p) # rebuild the cycle object
self.assertEqual(take(20, d), list('cdeabcdeabcdeabcdeab'))

def test_cycle_unpickle_compat(self):
testcases = [
b'citertools\ncycle\n(c__builtin__\niter\n((lI1\naI2\naI3\natRI1\nbtR((lI1\naI0\ntb.',
b'citertools\ncycle\n(c__builtin__\niter\n(](K\x01K\x02K\x03etRK\x01btR(]K\x01aK\x00tb.',
b'\x80\x02citertools\ncycle\nc__builtin__\niter\n](K\x01K\x02K\x03e\x85RK\x01b\x85R]K\x01aK\x00\x86b.',
b'\x80\x03citertools\ncycle\ncbuiltins\niter\n](K\x01K\x02K\x03e\x85RK\x01b\x85R]K\x01aK\x00\x86b.',
b'\x80\x04\x95=\x00\x00\x00\x00\x00\x00\x00\x8c\titertools\x8c\x05cycle\x93\x8c\x08builtins\x8c\x04iter\x93](K\x01K\x02K\x03e\x85RK\x01b\x85R]K\x01aK\x00\x86b.',

b'citertools\ncycle\n(c__builtin__\niter\n((lp0\nI1\naI2\naI3\natRI1\nbtR(g0\nI1\ntb.',
b'citertools\ncycle\n(c__builtin__\niter\n(]q\x00(K\x01K\x02K\x03etRK\x01btR(h\x00K\x01tb.',
b'\x80\x02citertools\ncycle\nc__builtin__\niter\n]q\x00(K\x01K\x02K\x03e\x85RK\x01b\x85Rh\x00K\x01\x86b.',
b'\x80\x03citertools\ncycle\ncbuiltins\niter\n]q\x00(K\x01K\x02K\x03e\x85RK\x01b\x85Rh\x00K\x01\x86b.',
b'\x80\x04\x95<\x00\x00\x00\x00\x00\x00\x00\x8c\titertools\x8c\x05cycle\x93\x8c\x08builtins\x8c\x04iter\x93]\x94(K\x01K\x02K\x03e\x85RK\x01b\x85Rh\x00K\x01\x86b.',

b'citertools\ncycle\n(c__builtin__\niter\n((lI1\naI2\naI3\natRI1\nbtR((lI1\naI00\ntb.',
b'citertools\ncycle\n(c__builtin__\niter\n(](K\x01K\x02K\x03etRK\x01btR(]K\x01aI00\ntb.',
b'\x80\x02citertools\ncycle\nc__builtin__\niter\n](K\x01K\x02K\x03e\x85RK\x01b\x85R]K\x01a\x89\x86b.',
b'\x80\x03citertools\ncycle\ncbuiltins\niter\n](K\x01K\x02K\x03e\x85RK\x01b\x85R]K\x01a\x89\x86b.',
b'\x80\x04\x95<\x00\x00\x00\x00\x00\x00\x00\x8c\titertools\x8c\x05cycle\x93\x8c\x08builtins\x8c\x04iter\x93](K\x01K\x02K\x03e\x85RK\x01b\x85R]K\x01a\x89\x86b.',

b'citertools\ncycle\n(c__builtin__\niter\n((lp0\nI1\naI2\naI3\natRI1\nbtR(g0\nI01\ntb.',
b'citertools\ncycle\n(c__builtin__\niter\n(]q\x00(K\x01K\x02K\x03etRK\x01btR(h\x00I01\ntb.',
b'\x80\x02citertools\ncycle\nc__builtin__\niter\n]q\x00(K\x01K\x02K\x03e\x85RK\x01b\x85Rh\x00\x88\x86b.',
b'\x80\x03citertools\ncycle\ncbuiltins\niter\n]q\x00(K\x01K\x02K\x03e\x85RK\x01b\x85Rh\x00\x88\x86b.',
b'\x80\x04\x95;\x00\x00\x00\x00\x00\x00\x00\x8c\titertools\x8c\x05cycle\x93\x8c\x08builtins\x8c\x04iter\x93]\x94(K\x01K\x02K\x03e\x85RK\x01b\x85Rh\x00\x88\x86b.',
]
assert len(testcases) == 20
for t in testcases:
it = pickle.loads(t)
self.assertEqual(take(10, it), [2, 3, 1, 2, 3, 1, 2, 3, 1, 2])

def test_cycle_setstate(self):
# Verify both modes for restoring state

Expand Down Expand Up @@ -739,6 +771,10 @@ def test_cycle_setstate(self):
c.__setstate__((tuple('defg'), 0))
take(20, c)

# The second argument in the setstate tuple must be an int
with self.assertRaises(TypeError):
cycle('defg').__setstate__((list('abcdefg'), 'x'))

self.assertRaises(TypeError, cycle('').__setstate__, ())
self.assertRaises(TypeError, cycle('').__setstate__, ([],))

Expand Down
5 changes: 3 additions & 2 deletions Modules/itertoolsmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1368,12 +1368,13 @@ cycle_setstate(cycleobject *lz, PyObject *state)
PyErr_SetString(PyExc_TypeError, "state is not a tuple");
return NULL;
}
if (!PyArg_ParseTuple(state, "O!p", &PyList_Type, &saved, &firstpass)) {
// The second item can be 1/0 in old pickles and True/False in new pickles
if (!PyArg_ParseTuple(state, "O!i", &PyList_Type, &saved, &firstpass)) {
return NULL;
}
Py_INCREF(saved);
Py_XSETREF(lz->saved, saved);
lz->firstpass = firstpass;
lz->firstpass = firstpass != 0;
lz->index = 0;
Py_RETURN_NONE;
}
Expand Down