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How to create a writeable buffer?

P: n/a
I'm trying to create an object (as a C extension) to support the buffer
interface and was getting "TypeError: buffer is read-only" errors. So I
had a look at the array object and it has the same problem:

$ python
>>import array
a=array.array('c', ['a', 'b', 'c'])
a
array('c', 'abc')
>>a[0]
'a'
>>a[0]='d'
a
array('c', 'dbc')
>>buf=buffer(a)
buf[0]
'd'
>>buf[0]='e'
TypeError: buffer is read-only

The array is a mutable (writable) object, and the array implements the
buffer interface and provides a 'getwritebuf' method.
(Python-2.4.4/Modules/arraymodule.c has an array_buffer_getwritebuf())
so why does it give "TypeError: buffer is read-only"?

Steve
Nov 20 '06 #1
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