packing unpacking depends on order.
Sven R. Kunze
srkunze at mail.de
Wed Sep 2 13:26:49 EDT 2015
I agree as well. First evaluate the right side, then assign it to the
left side at once.
On 02.09.2015 12:22, Nick Sarbicki wrote:
> That's interesting. I agree with you, I'd prefer the second result in
> both cases.
>
> But makes sense as it evaluates left to right and seems to break up
> the unpacking into separate statements.
>
> Could be useful if you want to hold the results of a generator in
> sequence, can call the same function multiple times and unpack as above.
>
> On Wed, Sep 2, 2015 at 11:07 AM Antoon Pardon
> <antoon.pardon at rece.vub.ac.be <mailto:antoon.pardon at rece.vub.ac.be>>
> wrote:
>
>
> >>> a = [1, 2, 3, 4, 5]
> >>> b = 1
> >>> b, a[b] = a[b], b
> >>> a
> [1, 2, 1, 4, 5]
> >>> a = [1, 2, 3, 4, 5]
> >>> b = 1
> >>> a[b], b = b, a[b]
> >>> a
> [1, 1, 3, 4, 5]
>
> I think I understand how it gets these results
> but I'm not really happy with them. I think python
> should give the second result in both cases.
>
> --
> Antoon Pardon
>
> --
> https://mail.python.org/mailman/listinfo/python-list
>
> --
> - Nick
>
>
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