Thanks for this feedback, Chris, Matthieu. Both are spot on - and thanks for the timing comparison, Matthieu. I suppose I didn't think to try the solution you suggest because I didn't think that I would end up with a single list, but 8 of them.
OK, I'll stop wriggling. Stephen. On Thu, Aug 12, 2021 at 10:22 AM Matthieu Dartiailh <m.dartia...@gmail.com> wrote: > You can achieve the same result by writing: > [None] * 8 > > Comparing both cases in IPython I get: > > In [1]: %timeit list((None,)*8) > 110 ns ± 0.785 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops > each) > > In [2]: %timeit [None] * 8 > 88.2 ns ± 0.432 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops > each) > > So the list multiplication appears a bit faster. > > Best > > Matthieu > > Le 8/12/2021 à 10:57 AM, Stephen Tucker a écrit : > > 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) > > > > > > ------------------------------------------- > > > > Thanks in anticipation. > > > > Stephen Tucker. > > -- > https://mail.python.org/mailman/listinfo/python-list > -- https://mail.python.org/mailman/listinfo/python-list
