This commit is contained in:
Raymond Hettinger 2017-01-16 22:44:14 -08:00
commit f6b96c7bb5
3 changed files with 25 additions and 0 deletions

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@ -563,6 +563,10 @@ The module defines the following classes, functions and decorators:
As a shorthand for this type, :class:`bytes` can be used to
annotate arguments of any of the types mentioned above.
.. class:: Deque(deque, MutableSequence[T])
A generic version of :class:`collections.deque`.
.. class:: List(list, MutableSequence[T])
Generic version of :class:`list`.

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@ -1572,6 +1572,9 @@ class CollectionsAbcTests(BaseTestCase):
def test_list(self):
self.assertIsSubclass(list, typing.List)
def test_deque(self):
self.assertIsSubclass(collections.deque, typing.Deque)
def test_set(self):
self.assertIsSubclass(set, typing.Set)
self.assertNotIsSubclass(frozenset, typing.Set)
@ -1642,6 +1645,14 @@ class CollectionsAbcTests(BaseTestCase):
self.assertIsSubclass(MyDefDict, collections.defaultdict)
self.assertNotIsSubclass(collections.defaultdict, MyDefDict)
def test_no_deque_instantiation(self):
with self.assertRaises(TypeError):
typing.Deque()
with self.assertRaises(TypeError):
typing.Deque[T]()
with self.assertRaises(TypeError):
typing.Deque[int]()
def test_no_set_instantiation(self):
with self.assertRaises(TypeError):
typing.Set()

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@ -59,6 +59,7 @@ __all__ = [
'SupportsRound',
# Concrete collection types.
'Deque',
'Dict',
'DefaultDict',
'List',
@ -1771,6 +1772,15 @@ class List(list, MutableSequence[T], extra=list):
"use list() instead")
return _generic_new(list, cls, *args, **kwds)
class Deque(collections.deque, MutableSequence[T], extra=collections.deque):
__slots__ = ()
def __new__(cls, *args, **kwds):
if _geqv(cls, Deque):
raise TypeError("Type Deque cannot be instantiated; "
"use deque() instead")
return _generic_new(collections.deque, cls, *args, **kwds)
class Set(set, MutableSet[T], extra=set):