[issue36761] Extended slice assignment + iterable unpacking
wim glenn
report at bugs.python.org
Mon May 13 17:33:08 EDT 2019
wim glenn <wim.glenn at gmail.com> added the comment:
Serhiy,
`a, *L[::2] = "abc"` as an alternative is interesting, thanks. The other example `L[:], *rest = 'abcdef'` is less interesting because L[:] can be arbitrary size.
When noticing this, I had tried to consume a generator into every other position in a list by using:
L[::2], *extra = g
Though there are obvious workarounds (e.g. using `itertools.islice`), it surprised me that CPython did not "do what I mean" out of the box.
However, since creating the issue, it was brought to my attention that trying to handle this assignment may result in potential ambiguity, for example:
L = [0, 1, 2]
L[::2], *rest = "ab", "c", "d"
There is no obvious choice for result here. So, perhaps this issue should just be closed.
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<https://bugs.python.org/issue36761>
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