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test_tuple.py
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import unittest
import gc
from test.support import import_helper
_testcapi = import_helper.import_module('_testcapi')
_testlimitedcapi = import_helper.import_module('_testlimitedcapi')
NULL = None
PY_SSIZE_T_MIN = _testcapi.PY_SSIZE_T_MIN
PY_SSIZE_T_MAX = _testcapi.PY_SSIZE_T_MAX
class TupleSubclass(tuple):
pass
class CAPITest(unittest.TestCase):
def test_check(self):
# Test PyTuple_Check()
check = _testlimitedcapi.tuple_check
self.assertTrue(check((1, 2)))
self.assertTrue(check(()))
self.assertTrue(check(TupleSubclass((1, 2))))
self.assertFalse(check({1: 2}))
self.assertFalse(check([1, 2]))
self.assertFalse(check(42))
self.assertFalse(check(object()))
# CRASHES check(NULL)
def test_tuple_checkexact(self):
# Test PyTuple_CheckExact()
check = _testlimitedcapi.tuple_checkexact
self.assertTrue(check((1, 2)))
self.assertTrue(check(()))
self.assertFalse(check(TupleSubclass((1, 2))))
self.assertFalse(check({1: 2}))
self.assertFalse(check([1, 2]))
self.assertFalse(check(42))
self.assertFalse(check(object()))
# CRASHES check(NULL)
def test_tuple_new(self):
# Test PyTuple_New()
tuple_new = _testlimitedcapi.tuple_new
size = _testlimitedcapi.tuple_size
checknull = _testcapi._check_tuple_item_is_NULL
tup1 = tuple_new(0)
self.assertEqual(tup1, ())
self.assertEqual(size(tup1), 0)
self.assertIs(type(tup1), tuple)
tup2 = tuple_new(1)
self.assertIs(type(tup2), tuple)
self.assertEqual(size(tup2), 1)
self.assertIsNot(tup2, tup1)
self.assertTrue(checknull(tup2, 0))
self.assertRaises(SystemError, tuple_new, -1)
self.assertRaises(SystemError, tuple_new, PY_SSIZE_T_MIN)
self.assertRaises(MemoryError, tuple_new, PY_SSIZE_T_MAX)
def test_tuple_pack(self):
# Test PyTuple_Pack()
pack = _testlimitedcapi.tuple_pack
self.assertEqual(pack(0), ())
self.assertEqual(pack(1, [1]), ([1],))
self.assertEqual(pack(2, [1], [2]), ([1], [2]))
self.assertRaises(SystemError, pack, PY_SSIZE_T_MIN)
self.assertRaises(SystemError, pack, -1)
self.assertRaises(MemoryError, pack, PY_SSIZE_T_MAX)
# CRASHES pack(1, NULL)
# CRASHES pack(2, [1])
def test_tuple_size(self):
# Test PyTuple_Size()
size = _testlimitedcapi.tuple_size
self.assertEqual(size(()), 0)
self.assertEqual(size((1, 2)), 2)
self.assertEqual(size(TupleSubclass((1, 2))), 2)
self.assertRaises(SystemError, size, [])
self.assertRaises(SystemError, size, 42)
self.assertRaises(SystemError, size, object())
# CRASHES size(NULL)
def test_tuple_get_size(self):
# Test PyTuple_GET_SIZE()
size = _testcapi.tuple_get_size
self.assertEqual(size(()), 0)
self.assertEqual(size((1, 2)), 2)
self.assertEqual(size(TupleSubclass((1, 2))), 2)
def test_tuple_getitem(self):
# Test PyTuple_GetItem()
getitem = _testlimitedcapi.tuple_getitem
tup = ([1], [2], [3])
self.assertEqual(getitem(tup, 0), [1])
self.assertEqual(getitem(tup, 2), [3])
tup2 = TupleSubclass(([1], [2], [3]))
self.assertEqual(getitem(tup2, 0), [1])
self.assertEqual(getitem(tup2, 2), [3])
self.assertRaises(IndexError, getitem, tup, PY_SSIZE_T_MIN)
self.assertRaises(IndexError, getitem, tup, -1)
self.assertRaises(IndexError, getitem, tup, len(tup))
self.assertRaises(IndexError, getitem, tup, PY_SSIZE_T_MAX)
self.assertRaises(SystemError, getitem, [1, 2, 3], 1)
self.assertRaises(SystemError, getitem, 42, 1)
# CRASHES getitem(NULL, 0)
def test_tuple_get_item(self):
# Test PyTuple_GET_ITEM()
get_item = _testcapi.tuple_get_item
tup = ([1], [2], [3])
self.assertEqual(get_item(tup, 0), [1])
self.assertEqual(get_item(tup, 2), [3])
tup2 = TupleSubclass(([1], [2], [3]))
self.assertEqual(get_item(tup2, 0), [1])
self.assertEqual(get_item(tup2, 2), [3])
# CRASHES get_item(NULL, 0)
def test_tuple_getslice(self):
# Test PyTuple_GetSlice()
getslice = _testlimitedcapi.tuple_getslice
# empty
tup = ([1], [2], [3])
self.assertEqual(getslice(tup, PY_SSIZE_T_MIN, 0), ())
self.assertEqual(getslice(tup, -1, 0), ())
self.assertEqual(getslice(tup, 3, PY_SSIZE_T_MAX), ())
self.assertEqual(getslice(tup, 1, 1), ())
self.assertEqual(getslice(tup, 2, 1), ())
tup = TupleSubclass(([1], [2], [3]))
self.assertEqual(getslice(tup, PY_SSIZE_T_MIN, 0), ())
self.assertEqual(getslice(tup, -1, 0), ())
self.assertEqual(getslice(tup, 3, PY_SSIZE_T_MAX), ())
self.assertEqual(getslice(tup, 1, 1), ())
self.assertEqual(getslice(tup, 2, 1), ())
# slice
tup = ([1], [2], [3], [4])
self.assertEqual(getslice(tup, 1, 3), ([2], [3]))
tup = TupleSubclass(([1], [2], [3], [4]))
self.assertEqual(getslice(tup, 1, 3), ([2], [3]))
# whole
tup = ([1], [2], [3])
self.assertEqual(getslice(tup, 0, 3), tup)
self.assertEqual(getslice(tup, 0, 100), tup)
self.assertEqual(getslice(tup, -100, 100), tup)
tup = TupleSubclass(([1], [2], [3]))
self.assertEqual(getslice(tup, 0, 3), tup)
self.assertEqual(getslice(tup, 0, 100), tup)
self.assertEqual(getslice(tup, -100, 100), tup)
self.assertRaises(SystemError, getslice, [[1], [2], [3]], 0, 0)
self.assertRaises(SystemError, getslice, 42, 0, 0)
# CRASHES getslice(NULL, 0, 0)
def test_tuple_setitem(self):
# Test PyTuple_SetItem()
setitem = _testlimitedcapi.tuple_setitem
checknull = _testcapi._check_tuple_item_is_NULL
tup = ([1], [2])
self.assertEqual(setitem(tup, 0, []), ([], [2]))
self.assertEqual(setitem(tup, 1, []), ([1], []))
tup2 = setitem(tup, 1, NULL)
self.assertTrue(checknull(tup2, 1))
tup2 = TupleSubclass(([1], [2]))
self.assertRaises(SystemError, setitem, tup2, 0, [])
self.assertRaises(IndexError, setitem, tup, PY_SSIZE_T_MIN, [])
self.assertRaises(IndexError, setitem, tup, -1, [])
self.assertRaises(IndexError, setitem, tup, len(tup), [])
self.assertRaises(IndexError, setitem, tup, PY_SSIZE_T_MAX, [])
self.assertRaises(SystemError, setitem, [1], 0, [])
self.assertRaises(SystemError, setitem, 42, 0, [])
# CRASHES setitem(NULL, 0, [])
def test_tuple_set_item(self):
# Test PyTuple_SET_ITEM()
set_item = _testcapi.tuple_set_item
checknull = _testcapi._check_tuple_item_is_NULL
tup = ([1], [2])
self.assertEqual(set_item(tup, 0, []), ([], [2]))
self.assertEqual(set_item(tup, 1, []), ([1], []))
tup2 = set_item(tup, 1, NULL)
self.assertTrue(checknull(tup2, 1))
tup2 = TupleSubclass(([1], [2]))
self.assertIs(set_item(tup2, 0, []), tup2)
self.assertEqual(tup2, ([], [2]))
# CRASHES set_item(tup, -1, [])
# CRASHES set_item(tup, len(tup), [])
# CRASHES set_item([1], 0, [])
# CRASHES set_item(NULL, 0, [])
def test__tuple_resize(self):
# Test _PyTuple_Resize()
resize = _testcapi._tuple_resize
checknull = _testcapi._check_tuple_item_is_NULL
a = ()
b = resize(a, 0, False)
self.assertEqual(len(a), 0)
self.assertEqual(len(b), 0)
b = resize(a, 2, False)
self.assertEqual(len(a), 0)
self.assertEqual(len(b), 2)
self.assertTrue(checknull(b, 0))
self.assertTrue(checknull(b, 1))
a = ([1], [2], [3])
b = resize(a, 3)
self.assertEqual(b, a)
b = resize(a, 2)
self.assertEqual(b, a[:2])
b = resize(a, 5)
self.assertEqual(len(b), 5)
self.assertEqual(b[:3], a)
self.assertTrue(checknull(b, 3))
self.assertTrue(checknull(b, 4))
a = ()
self.assertRaises(MemoryError, resize, a, PY_SSIZE_T_MAX)
self.assertRaises(SystemError, resize, a, -1)
self.assertRaises(SystemError, resize, a, PY_SSIZE_T_MIN)
# refcount > 1
a = (1, 2, 3)
self.assertRaises(SystemError, resize, a, 3, False)
self.assertRaises(SystemError, resize, a, 0, False)
# non-tuple
self.assertRaises(SystemError, resize, [1, 2, 3], 0, False)
self.assertRaises(SystemError, resize, NULL, 0, False)
def test_bug_59313(self):
# Before 3.14, the C-API function PySequence_Tuple
# would create incomplete tuples which were visible to
# the cycle GC, and this test would crash the interpeter.
TAG = object()
tuples = []
def referrer_tuples():
return [x for x in gc.get_referrers(TAG)
if isinstance(x, tuple)]
def my_iter():
nonlocal tuples
yield TAG # 'tag' gets stored in the result tuple
tuples += referrer_tuples()
for x in range(10):
tuples += referrer_tuples()
# Prior to 3.13 would raise a SystemError when the tuple needs to be resized
yield x
self.assertEqual(tuple(my_iter()), (TAG, *range(10)))
self.assertEqual(tuples, [])
if __name__ == "__main__":
unittest.main()