[issue13072] Getting a buffer from a Unicode array uses invalid format

[Stefan Krah]

Stefan Krah <stefan-usenet at bytereef.org> added the comment:

STINNER Victor <report at bugs.python.org> wrote:
> > # Not implemented formats. Ugly, but inevitable. This is the same as
> > # issue #2531: equality is also used for membership testing and must
> > # return a result.
> > a = array.array('u', 'xyz')
> > v = memoryview(a)
> > self.assertNotEqual(v, a)
> > self.assertNotEqual(a, v)
> 
> I don't understand: a buffer format is a format for the struct module, 
> or for the array module?

It's like this: memoryview follows the current struct syntax, which
doesn't have 'u'. memory_richcompare() does not understand 'u', but
is required to return something for __eq__ and __ne__, so it returns
'not equal'.

This isn't so important, since I discovered (see my later post)
that 'u' and 'w' were scheduled for inclusion in the struct
module anyway.

So I think we should focus on whether the proposed 'c', 'u' and 'w'
format specifiers still make sense after the PEP-393 changes.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13072>
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