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Issue 23704: Add index(), copy(), and insert() to deques. Register deques as a MutableSequence.
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@ -437,6 +437,13 @@ or subtracting from an empty counter.
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Remove all elements from the deque leaving it with length 0.
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.. method:: copy()
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Create a shallow copy of the deque.
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.. versionadded:: 3.5
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.. method:: count(x)
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Count the number of deque elements equal to *x*.
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@ -457,6 +464,21 @@ or subtracting from an empty counter.
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elements in the iterable argument.
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.. method:: index(x[, start[, end]])
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Return the position of *x* in the deque. Returns the first match
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or raises :exc:`ValueError` if not found.
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.. versionadded:: 3.5
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.. method:: insert(i, x)
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Insert *x* into the deque at position *i*.
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.. versionadded:: 3.5
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.. method:: pop()
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Remove and return an element from the right side of the deque. If no
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@ -16,6 +16,8 @@ from _weakref import proxy as _proxy
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from itertools import repeat as _repeat, chain as _chain, starmap as _starmap
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from reprlib import recursive_repr as _recursive_repr
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MutableSequence.register(deque)
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################################################################################
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### OrderedDict
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################################################################################
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@ -13,6 +13,7 @@ import re
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import sys
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from collections import UserDict
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from collections import ChainMap
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from collections import deque
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from collections.abc import Hashable, Iterable, Iterator
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from collections.abc import Sized, Container, Callable
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from collections.abc import Set, MutableSet
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@ -1014,7 +1015,7 @@ class TestCollectionABCs(ABCTestCase):
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for sample in [tuple, str, bytes]:
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self.assertNotIsInstance(sample(), MutableSequence)
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self.assertFalse(issubclass(sample, MutableSequence))
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for sample in [list, bytearray]:
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for sample in [list, bytearray, deque]:
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self.assertIsInstance(sample(), MutableSequence)
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self.assertTrue(issubclass(sample, MutableSequence))
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self.assertFalse(issubclass(str, MutableSequence))
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@ -231,6 +231,54 @@ class TestBasic(unittest.TestCase):
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self.assertRaises(IndexError, d.__getitem__, 0)
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self.assertRaises(IndexError, d.__getitem__, -1)
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def test_index(self):
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for n in 1, 2, 30, 40, 200:
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d = deque(range(n))
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for i in range(n):
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self.assertEqual(d.index(i), i)
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with self.assertRaises(ValueError):
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d.index(n+1)
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# Test detection of mutation during iteration
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d = deque(range(n))
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d[n//2] = MutateCmp(d, False)
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with self.assertRaises(RuntimeError):
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d.index(n)
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# Test detection of comparison exceptions
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d = deque(range(n))
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d[n//2] = BadCmp()
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with self.assertRaises(RuntimeError):
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d.index(n)
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# Test start and stop arguments behavior matches list.index()
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elements = 'ABCDEFGHI'
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nonelement = 'Z'
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d = deque(elements * 2)
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s = list(elements * 2)
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for start in range(-5 - len(s)*2, 5 + len(s) * 2):
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for stop in range(-5 - len(s)*2, 5 + len(s) * 2):
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for element in elements + 'Z':
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try:
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target = s.index(element, start, stop)
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except ValueError:
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with self.assertRaises(ValueError):
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d.index(element, start, stop)
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else:
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self.assertEqual(d.index(element, start, stop), target)
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def test_insert(self):
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# Test to make sure insert behaves like lists
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elements = 'ABCDEFGHI'
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for i in range(-5 - len(elements)*2, 5 + len(elements) * 2):
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d = deque('ABCDEFGHI')
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s = list('ABCDEFGHI')
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d.insert(i, 'Z')
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s.insert(i, 'Z')
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self.assertEqual(list(d), s)
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def test_setitem(self):
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n = 200
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d = deque(range(n))
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@ -524,6 +572,15 @@ class TestBasic(unittest.TestCase):
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self.assertNotEqual(id(d), id(e))
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self.assertEqual(list(d), list(e))
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def test_copy_method(self):
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mut = [10]
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d = deque([mut])
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e = d.copy()
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self.assertEqual(list(d), list(e))
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mut[0] = 11
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self.assertNotEqual(id(d), id(e))
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self.assertEqual(list(d), list(e))
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def test_reversed(self):
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for s in ('abcd', range(2000)):
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self.assertEqual(list(reversed(deque(s))), list(reversed(s)))
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@ -27,6 +27,10 @@ Library
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and socket open until the garbage collector cleans them up. Patch by
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Martin Panter.
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- Issue #23704: collections.deque() objects now support methods for index(),
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insert(), and copy(). This allows deques to be registered as a
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MutableSequence and it improves their substitutablity for lists.
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- Issue #23715: :func:`signal.sigwaitinfo` and :func:`signal.sigtimedwait` are
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now retried when interrupted by a signal not in the *sigset* parameter, if
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the signal handler does not raise an exception. signal.sigtimedwait()
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@ -762,6 +762,91 @@ deque_len(dequeobject *deque)
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return Py_SIZE(deque);
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}
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static PyObject *
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deque_index(dequeobject *deque, PyObject *args)
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{
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Py_ssize_t i, start=0, stop=Py_SIZE(deque);
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PyObject *v, *item;
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block *b = deque->leftblock;
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Py_ssize_t index = deque->leftindex;
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size_t start_state = deque->state;
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if (!PyArg_ParseTuple(args, "O|O&O&:index", &v,
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_PyEval_SliceIndex, &start,
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_PyEval_SliceIndex, &stop))
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return NULL;
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if (start < 0) {
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start += Py_SIZE(deque);
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if (start < 0)
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start = 0;
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}
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if (stop < 0) {
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stop += Py_SIZE(deque);
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if (stop < 0)
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stop = 0;
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}
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for (i=0 ; i<stop ; i++) {
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if (i >= start) {
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int cmp;
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CHECK_NOT_END(b);
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item = b->data[index];
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cmp = PyObject_RichCompareBool(item, v, Py_EQ);
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if (cmp > 0)
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return PyLong_FromSsize_t(i);
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else if (cmp < 0)
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return NULL;
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if (start_state != deque->state) {
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PyErr_SetString(PyExc_RuntimeError,
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"deque mutated during iteration");
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return NULL;
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}
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}
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index++;
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if (index == BLOCKLEN) {
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b = b->rightlink;
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index = 0;
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}
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}
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PyErr_Format(PyExc_ValueError, "%R is not in deque", v);
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return NULL;
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}
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PyDoc_STRVAR(index_doc,
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"D.index(value, [start, [stop]]) -> integer -- return first index of value.\n"
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"Raises ValueError if the value is not present.");
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static PyObject *
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deque_insert(dequeobject *deque, PyObject *args)
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{
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Py_ssize_t index;
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Py_ssize_t n = Py_SIZE(deque);
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PyObject *value;
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PyObject *rv;
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if (!PyArg_ParseTuple(args, "nO:insert", &index, &value))
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return NULL;
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if (index >= n)
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return deque_append(deque, value);
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if (index <= -n || index == 0)
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return deque_appendleft(deque, value);
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if (_deque_rotate(deque, -index))
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return NULL;
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if (index < 0)
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rv = deque_append(deque, value);
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else
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rv = deque_appendleft(deque, value);
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if (rv == NULL)
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return NULL;
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Py_DECREF(rv);
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if (_deque_rotate(deque, index))
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return NULL;
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Py_RETURN_NONE;
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}
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PyDoc_STRVAR(insert_doc,
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"D.insert(index, object) -- insert object before index");
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static PyObject *
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deque_remove(dequeobject *deque, PyObject *value)
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{
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@ -1208,12 +1293,18 @@ static PyMethodDef deque_methods[] = {
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METH_NOARGS, clear_doc},
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{"__copy__", (PyCFunction)deque_copy,
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METH_NOARGS, copy_doc},
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{"copy", (PyCFunction)deque_copy,
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METH_NOARGS, copy_doc},
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{"count", (PyCFunction)deque_count,
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METH_O, count_doc},
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{"extend", (PyCFunction)deque_extend,
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METH_O, extend_doc},
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{"extendleft", (PyCFunction)deque_extendleft,
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METH_O, extendleft_doc},
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{"index", (PyCFunction)deque_index,
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METH_VARARGS, index_doc},
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{"insert", (PyCFunction)deque_insert,
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METH_VARARGS, insert_doc},
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{"pop", (PyCFunction)deque_pop,
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METH_NOARGS, pop_doc},
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{"popleft", (PyCFunction)deque_popleft,
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