py: Allow bytes/bytearray/array to be init'd by buffer protocol objects.

Behaviour of array initialisation is subtly different for bytes,
bytearray and array.array when argument has buffer protocol.  This patch
gets us CPython conformant (except we allow initialisation of
array.array by buffer with length not a multiple of typecode).

3 files changed, 46 insertions, 0 deletions

diff --git a/tests/basics/array_construct.py b/tests/basics/array_construct.py
new file mode 100644
index 0000000000..e050f3003b
--- /dev/null
+++ b/tests/basics/array_construct.py
@@ -0,0 +1,18 @@
+# test construction of array.array from different objects
+
+from array import array
+
+# tuple, list
+print(array('b', (1, 2)))
+print(array('h', [1, 2]))
+
+# raw copy from bytes, bytearray
+print(array('h', b'12'))
+print(array('h', bytearray(2)))
+print(array('i', bytearray(4)))
+
+# convert from other arrays
+print(array('H', array('b', [1, 2])))
+print(array('f', array('h', [1, 2])))
+print(array('b', array('I', [1, 2])))
+print(array('d', array('f', [1, 2])))
diff --git a/tests/basics/bytearray_construct.py b/tests/basics/bytearray_construct.py
new file mode 100644
index 0000000000..0a7097d55a
--- /dev/null
+++ b/tests/basics/bytearray_construct.py
@@ -0,0 +1,14 @@
+# test construction of bytearray from different objects
+
+from array import array
+
+# bytes, tuple, list
+print(bytearray(b'123'))
+print(bytearray((1, 2)))
+print(bytearray([1, 2]))
+
+# arrays
+print(bytearray(array('b', [1, 2])))
+print(bytearray(array('h', [1, 2])))
+print(bytearray(array('I', [1, 2])))
+print(bytearray(array('f', [1, 2.3])))
diff --git a/tests/basics/bytes_construct.py b/tests/basics/bytes_construct.py
new file mode 100644
index 0000000000..1eb6d3e485
--- /dev/null
+++ b/tests/basics/bytes_construct.py
@@ -0,0 +1,14 @@
+# test construction of bytes from different objects
+
+from array import array
+
+# tuple, list, bytearray
+print(bytes((1, 2)))
+print(bytes([1, 2]))
+print(bytes(bytearray(4)))
+
+# arrays
+print(bytes(array('b', [1, 2])))
+print(bytes(array('h', [1, 2])))
+print(bytes(array('I', [1, 2])))
+print(bytes(array('f', [1, 2.3])))