import sys
from test import list_tests
from test.support import cpython_only
import pickle
import unittest
class ListTest(list_tests.CommonTest):
type2test = list
def test_basic(self):
self.assertEqual(list([]), [])
l0_3 = [0, 1, 2, 3]
l0_3_bis = list(l0_3)
self.assertEqual(l0_3, l0_3_bis)
self.assertTrue(l0_3 is not l0_3_bis)
self.assertEqual(list(()), [])
self.assertEqual(list((0, 1, 2, 3)), [0, 1, 2, 3])
self.assertEqual(list(''), [])
self.assertEqual(list('spam'), ['s', 'p', 'a', 'm'])
self.assertEqual(list(x for x in range(10) if x % 2),
[1, 3, 5, 7, 9])
if sys.maxsize == 0x7fffffff:
# This test can currently only work on 32-bit machines.
# XXX If/when PySequence_Length() returns a ssize_t, it should be
# XXX re-enabled.
# Verify clearing of bug #556025.
# This assumes that the max data size (sys.maxint) == max
# address size this also assumes that the address size is at
# least 4 bytes with 8 byte addresses, the bug is not well
# tested
#
# Note: This test is expected to SEGV under Cygwin 1.3.12 or
# earlier due to a newlib bug. See the following mailing list
# thread for the details:
# http://sources.redhat.com/ml/newlib/2002/msg00369.html
self.assertRaises(MemoryError, list, range(sys.maxsize // 2))
# This code used to segfault in Py2.4a3
x = []
x.extend(-y for y in x)
self.assertEqual(x, [])
def test_keyword_args(self):
with self.assertRaisesRegex(TypeError, 'keyword argument'):
list(sequence=[])
def test_keywords_in_subclass(self):
class subclass(list):
pass
u = subclass([1, 2])
self.assertIs(type(u), subclass)
self.assertEqual(list(u), [1, 2])
with self.assertRaises(TypeError):
subclass(sequence=())
class subclass_with_init(list):
def __init__(self, seq, newarg=None):
super().__init__(seq)
self.newarg = newarg
u = subclass_with_init([1, 2], newarg=3)
self.assertIs(type(u), subclass_with_init)
self.assertEqual(list(u), [1, 2])
self.assertEqual(u.newarg, 3)
class subclass_with_new(list):
def __new__(cls, seq, newarg=None):
self = super().__new__(cls, seq)
self.newarg = newarg
return self
u = subclass_with_new([1, 2], newarg=3)
self.assertIs(type(u), subclass_with_new)
self.assertEqual(list(u), [1, 2])
self.assertEqual(u.newarg, 3)
def test_truth(self):
super().test_truth()
self.assertTrue(not [])
self.assertTrue([42])
def test_identity(self):
self.assertTrue([] is not [])
def test_len(self):
super().test_len()
self.assertEqual(len([]), 0)
self.assertEqual(len([0]), 1)
self.assertEqual(len([0, 1, 2]), 3)
def test_overflow(self):
lst = [4, 5, 6, 7]
n = int((sys.maxsize*2+2) // len(lst))
def mul(a, b): return a * b
def imul(a, b): a *= b
self.assertRaises((MemoryError, OverflowError), mul, lst, n)
self.assertRaises((MemoryError, OverflowError), imul, lst, n)
def test_empty_slice(self):
x = []
x[:] = x
self.assertEqual(x, [])
def test_list_resize_overflow(self):
# gh-97616: test new_allocated * sizeof(PyObject*) overflow
# check in list_resize()
lst = [0] * 65
del lst[1:]
self.assertEqual(len(lst), 1)
size = sys.maxsize
with self.assertRaises((MemoryError, OverflowError)):
lst * size
with self.assertRaises((MemoryError, OverflowError)):
lst *= size
def test_repr_large(self):
# Check the repr of large list objects
def check(n):
l = [0] * n
s = repr(l)
self.assertEqual(s,
'[' + ', '.join(['0'] * n) + ']')
check(10) # check our checking code
check(1000000)
def test_iterator_pickle(self):
orig = self.type2test([4, 5, 6, 7])
data = [10, 11, 12, 13, 14, 15]
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
# initial iterator
itorig = iter(orig)
d = pickle.dumps((itorig, orig), proto)
it, a = pickle.loads(d)
a[:] = data
self.assertEqual(type(it), type(itorig))
self.assertEqual(list(it), data)
# running iterator
next(itorig)
d = pickle.dumps((itorig, orig), proto)
it, a = pickle.loads(d)
a[:] = data
self.assertEqual(type(it), type(itorig))
self.assertEqual(list(it), data[1:])
# empty iterator
for i in range(1, len(orig)):
next(itorig)
d = pickle.dumps((itorig, orig), proto)
it, a = pickle.loads(d)
a[:] = data
self.assertEqual(type(it), type(itorig))
self.assertEqual(list(it), data[len(orig):])
# exhausted iterator
self.assertRaises(StopIteration, next, itorig)
d = pickle.dumps((itorig, orig), proto)
it, a = pickle.loads(d)
a[:] = data
self.assertEqual(list(it), [])
def test_reversed_pickle(self):
orig = self.type2test([4, 5, 6, 7])
data = [10, 11, 12, 13, 14, 15]
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
# initial iterator
itorig = reversed(orig)
d = pickle.dumps((itorig, orig), proto)
it, a = pickle.loads(d)
a[:] = data
self.assertEqual(type(it), type(itorig))
self.assertEqual(list(it), data[len(orig)-1::-1])
# running iterator
next(itorig)
d = pickle.dumps((itorig, orig), proto)
it, a = pickle.loads(d)
a[:] = data
self.assertEqual(type(it), type(itorig))
self.assertEqual(list(it), data[len(orig)-2::-1])
# empty iterator
for i in range(1, len(orig)):
next(itorig)
d = pickle.dumps((itorig, orig), proto)
it, a = pickle.loads(d)
a[:] = data
self.assertEqual(type(it), type(itorig))
self.assertEqual(list(it), [])
# exhausted iterator
self.assertRaises(StopIteration, next, itorig)
d = pickle.dumps((itorig, orig), proto)
it, a = pickle.loads(d)
a[:] = data
self.assertEqual(list(it), [])
def test_step_overflow(self):
a = [0, 1, 2, 3, 4]
a[1::sys.maxsize] = [0]
self.assertEqual(a[3::sys.maxsize], [3])
def test_no_comdat_folding(self):
# Issue 8847: In the PGO build, the MSVC linker's COMDAT folding
# optimization causes failures in code that relies on distinct
# function addresses.
class L(list): pass
with self.assertRaises(TypeError):
(3,) + L([1,2])
def test_equal_operator_modifying_operand(self):
# test fix for seg fault reported in bpo-38588 part 2.
class X:
def __eq__(self,other) :
list2.clear()
return NotImplemented
class Y:
def __eq__(self, other):
list1.clear()
return NotImplemented
class Z:
def __eq__(self, other):
list3.clear()
return NotImplemented
list1 = [X()]
list2 = [Y()]
self.assertTrue(list1 == list2)
list3 = [Z()]
list4 = [1]
self.assertFalse(list3 == list4)
def test_lt_operator_modifying_operand(self):
# See gh-120298
class evil:
def __lt__(self, other):
other.clear()
return NotImplemented
a = [[evil()]]
with self.assertRaises(TypeError):
a[0] < a
def test_list_index_modifing_operand(self):
# See gh-120384
class evil:
def __init__(self, lst):
self.lst = lst
def __iter__(self):
yield from self.lst
self.lst.clear()
lst = list(range(5))
operand = evil(lst)
with self.assertRaises(ValueError):
lst[::-1] = operand
@cpython_only
def test_preallocation(self):
iterable = [0] * 10
iter_size = sys.getsizeof(iterable)
self.assertEqual(iter_size, sys.getsizeof(list([0] * 10)))
self.assertEqual(iter_size, sys.getsizeof(list(range(10))))
def test_count_index_remove_crashes(self):
# bpo-38610: The count(), index(), and remove() methods were not
# holding strong references to list elements while calling
# PyObject_RichCompareBool().
class X:
def __eq__(self, other):
lst.clear()
return NotImplemented
lst = [X()]
with self.assertRaises(ValueError):
lst.index(lst)
class L(list):
def __eq__(self, other):
str(other)
return NotImplemented
lst = L([X()])
lst.count(lst)
lst = L([X()])
with self.assertRaises(ValueError):
lst.remove(lst)
# bpo-39453: list.__contains__ was not holding strong references
# to list elements while calling PyObject_RichCompareBool().
lst = [X(), X()]
3 in lst
lst = [X(), X()]
X() in lst
def test_tier2_invalidates_iterator(self):
# GH-121012
for _ in range(100):
a = [1, 2, 3]
it = iter(a)
for _ in it:
pass
a.append(4)
self.assertEqual(list(it), [])
if __name__ == "__main__":
unittest.main()
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