Skip to content

bpo-30537: use PyNumber in itertools.islice instead of PyLong #1918

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Jun 8, 2017
Merged

bpo-30537: use PyNumber in itertools.islice instead of PyLong #1918

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
4c73e4d
bpo-30537: use PyNumber in itertools instead of PyLong
Jun 2, 2017
d6f8d1f
bpo-30537: revert changes except to islice_new
Jun 5, 2017
ce23e9a
bpo-30537: test itertools.islice and add entry to Misc/NEWS
Jun 7, 2017
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
13 changes: 13 additions & 0 deletions Lib/test/test_itertools.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1243,6 +1243,19 @@ def test_islice(self):
support.gc_collect()
self.assertIsNone(wr())

# Issue #30537: islice can accept integer-like objects as
# arguments
class IntLike(object):
def __init__(self, val):
self.val = val
def __index__(self):
return self.val
self.assertEqual(list(islice(range(100), IntLike(10))), list(range(10)))
self.assertEqual(list(islice(range(100), IntLike(10), IntLike(50))),
list(range(10, 50)))
self.assertEqual(list(islice(range(100), IntLike(10), IntLike(50), IntLike(5))),
list(range(10,50,5)))

def test_takewhile(self):
data = [1, 3, 5, 20, 2, 4, 6, 8]
self.assertEqual(list(takewhile(underten, data)), [1, 3, 5])
Expand Down
3 changes: 3 additions & 0 deletions Misc/NEWS
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,9 @@ Core and Builtins

- bpo-29546: Improve from-import error message with location

- bpo-30537: itertools.islice now accepts integer-like objects (having
an __index__ method) as start, stop, and slice arguments

- Issue #29319: Prevent RunMainFromImporter overwriting sys.path[0].

- Issue #29337: Fixed possible BytesWarning when compare the code objects.
Expand Down
8 changes: 4 additions & 4 deletions Modules/itertoolsmodule.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1417,7 +1417,7 @@ islice_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
numargs = PyTuple_Size(args);
if (numargs == 2) {
if (a1 != Py_None) {
stop = PyLong_AsSsize_t(a1);
stop = PyNumber_AsSsize_t(a1, PyExc_OverflowError);
if (stop == -1) {
if (PyErr_Occurred())
PyErr_Clear();
Expand All @@ -1429,11 +1429,11 @@ islice_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
}
} else {
if (a1 != Py_None)
start = PyLong_AsSsize_t(a1);
start = PyNumber_AsSsize_t(a1, PyExc_OverflowError);
if (start == -1 && PyErr_Occurred())
PyErr_Clear();
if (a2 != Py_None) {
stop = PyLong_AsSsize_t(a2);
stop = PyNumber_AsSsize_t(a2, PyExc_OverflowError);
if (stop == -1) {
if (PyErr_Occurred())
PyErr_Clear();
Expand All @@ -1453,7 +1453,7 @@ islice_new(PyTypeObject *type, PyObject *args, PyObject *kwds)

if (a3 != NULL) {
if (a3 != Py_None)
step = PyLong_AsSsize_t(a3);
step = PyNumber_AsSsize_t(a3, PyExc_OverflowError);
if (step == -1 && PyErr_Occurred())
PyErr_Clear();
}
Expand Down