STINNER Victor added the comment:

>> With the patch, the deletion succeeded even if you get a MemoryError. The 
>> bytearray object is consistent. It's just that its buffer could be smaller 
>> (it wastes memory).

>I think intuitively I'd expect the object to be unmodified 
>if there is any error.

It would be possible to have a fully atomic operation, but it would kill 
performances: you have to allocate a temporary buffer to store the removed 
bytes. I prefer to not kill performances for a very rare case.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19568>
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