Is there a better way to create a list of None objects?
Chris Angelico
rosuav at gmail.com
Thu Aug 12 05:11:06 EDT 2021
On Thu, Aug 12, 2021 at 6:59 PM Stephen Tucker <stephen_tucker at sil.org> wrote:
>
> Hi,
>
> I thought I'd share the following piece of code that I have recently written
> (a) to check that what I have done is reasonable - even optimum,
> (b) to inform others who might be wanting to do similar things, and
> (c) to invite comment from the community.
>
> -------------------------------------------
>
> #
>
> # Yes: Create an empty list of Band Limits for this language
>
> #
>
> # Note. The rather complicated logic on the right-hand side of the
>
> # assignment below is used here because none of the following
>
> # alternatives had the desired effect:
>
> #
>
> # Logic Effect
>
> #
>
> # [None * 8] TypeError: unsupported operand type(s) for *: ...
>
> # [(None) * 8] TypeError: unsupported operand type(s) for *: ...
>
> # [((None)) * 8] TypeError: unsupported operand type(s) for *: ...
>
> # [(None,) * 8] [(None, None, None, None, None, None, None, None)]
>
> # list ((None) * 8) TypeError: unsupported operand type(s) for *: ...
>
> #
>
> diclll_BLim [thisISO_] = list ((None,) * 8)
>
Why not just:
[None] * 8
?
ChrisA
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