diff options
| -rw-r--r-- | Modules/_collectionsmodule.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c index 1ca6c72d37..0e594703d0 100644 --- a/Modules/_collectionsmodule.c +++ b/Modules/_collectionsmodule.c @@ -1053,13 +1053,13 @@ deque_index(dequeobject *deque, PyObject *args) } } - n = stop - i; - while (n--) { + n = stop - i + 1; + while (--n) { CHECK_NOT_END(b); item = b->data[index]; cmp = PyObject_RichCompareBool(item, v, Py_EQ); if (cmp > 0) - return PyLong_FromSsize_t(stop - (n + 1)); + return PyLong_FromSsize_t(stop - n); if (cmp < 0) return NULL; if (start_state != deque->state) { |