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bpo-27639: Correct return type for UserList slicing operation (#13169)

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* BPO-27639: Correct return type for UserList slicing operation

Added logic to __getitem__ magic method for UserList to ensure that the return
type matches that of self.
This commit is contained in:
Michael Blahay 2019-05-07 17:41:06 -04:00 • committed by Mark Shannon
parent ca87eebb22
commit b1c3167c23
3 changed files with 13 additions and 1 deletions
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6
Lib/test/test_userlist.py
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@ -17,6 +17,12 @@ class UserListTest(list_tests.CommonTest):
for j in range(-3, 6):
self.assertEqual(u[i:j], l[i:j])
def test_slice_type(self):
l = [0, 1, 2, 3, 4]
u = UserList(l)
self.assertIsInstance(u[:], u.__class__)
self.assertEqual(u[:],u)
def test_add_specials(self):
u = UserList("spam")
u2 = u + "eggs"