David Beazley added the comment:
There's probably a bigger discussion about memoryviews for a rainy day.
However, the number one thing that would save all of this in my book would be
to make sure cast('B') is universally supported regardless of format including
endianness--especially in the standard library. For example, being able to do
this:
>>> a = array.array('d',[1.0, 2.0, 3.0, 4.0])
>>> m = memoryview(a).cast('B')
>>> m[0:4] = b'\x00\x01\x02\x03'
>>> a
array('d', [1.0000000112050316, 2.0, 3.0, 4.0])
>>>
Right now, it doesn't work for ctypes. For example:
>>> import ctypes
>>> a = (ctypes.c_double * 4)(1,2,3,4)
>>> a
<__main__.c_double_Array_4 object at 0x1006a7cb0>
>>> m = memoryview(a).cast('B')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: memoryview: source format must be a native single character format
prefixed with an optional '@'
>>>
As some background, being able to work with a "byte" view of memory is
important for a lot of problems involving I/O, data interchange, and related
problems where being able to accurately construct/deconstruct the underlying
memory buffers is more useful than actually interpreting their contents.
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<http://bugs.python.org/issue15944>
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