if I have an assignment
a = <some_generator> then a is the generator. 

But if I do any kind of unpacking
*a, = <some_generator> # a list of all items
a, *aa = <some_generator> # first item in a, list of rest in as

If the right-hand side is a generator expression, I would expect that 
a, *aa unpacks the first element into a and puts the whole generator (having yielded the first element) back into aa.

So the star-operator of tuple unpacking with the right-hand-side having a generator should be lazy and not exhaust the whole generator.

But when the starred element is not the final one, it couldn’t be lazy, so you would end up with an inconsistency.

a, *rest, z = <generator>

Also, it would be inconsistent with other kinds of iterables, which get turned into list objects.

>>> a, *aa = (1, 2)
>>> aa
[2]
>>> a, *aa = "abc"
>>> aa
['b', 'c']

You are right. I didn't even know 
head, *middle, end = <generator>
worked.

Thanks