Add ABC ByteString which unifies bytes and bytearray (but not memoryview).
There's no ABC for "PEP 3118 style buffer API objects" because there's no
way to recognize these in Python (apart from trying to use memoryview()
on them).
Note that array.array really should be registered as a MutableSequence
but that would require importing it whenever collections is imported.
diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index 3ccc06c..62da9c5 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -8,6 +8,7 @@
from collections import Set, MutableSet
from collections import Mapping, MutableMapping
from collections import Sequence, MutableSequence
+from collections import ByteString
class TestNamedTuple(unittest.TestCase):
@@ -260,11 +261,21 @@
self.failUnless(issubclass(sample, Sequence))
self.failUnless(issubclass(str, Sequence))
+ def test_ByteString(self):
+ for sample in [bytes, bytearray]:
+ self.failUnless(isinstance(sample(), ByteString))
+ self.failUnless(issubclass(sample, ByteString))
+ for sample in [str, list, tuple]:
+ self.failIf(isinstance(sample(), ByteString))
+ self.failIf(issubclass(sample, ByteString))
+ self.failIf(isinstance(memoryview(b""), ByteString))
+ self.failIf(issubclass(memoryview, ByteString))
+
def test_MutableSequence(self):
- for sample in [tuple, str]:
+ for sample in [tuple, str, bytes]:
self.failIf(isinstance(sample(), MutableSequence))
self.failIf(issubclass(sample, MutableSequence))
- for sample in [list, bytes]:
+ for sample in [list, bytearray]:
self.failUnless(isinstance(sample(), MutableSequence))
self.failUnless(issubclass(sample, MutableSequence))
self.failIf(issubclass(str, MutableSequence))