[issue12740] Add struct.Struct.nmemb

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> It looks like the choice is between s.nmembers and len(s). I thought
> about len(s), but since Struct.pack() returns a bytes object, this
> might be confusing.

I agree there's a risk of confusion between len()-number-of-elements and
size()-number-of-bytes.
We have a similar confusion with the memoryview object and in retrospect
it's often quite misleading.

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<http://bugs.python.org/issue12740>
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