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I expect struct.pack_into to work for a memoryview. Currently struct.pack_into throws an exception.
>>> import struct
>>> buf = bytearray(10)
>>> struct.pack_into("<B", buf, 0, 99)
>>> buf[0]
99
>>> view = memoryview(buf)
>>> view.readonly
False
>>> struct.pack_into("<B", view, 0, 88)
Traceback (most recent call last):
 File "<input>", line 1, in <module>
TypeError: expected a writeable buffer object
>>> view[0:1] = 'a'
>>> view[0]
'a'
>>> buf[0]
97
>>> chr(buf[0])
'a'
The memoryview is writeable and from what I can tell from the documentation it implements the buffer interface, but struct.pack_into will not use it.