Chris Angelico wrote:
> I think this is an artifact of Python not having an empty set literal.
> [snip]
> When both use the constructor call or both use a literal, the
> difference is far smaller. I'd call this one a wash.
Ah, good catch. I hadn't considered that it would make a substantial
difference, but that makes sense. Here's an additional comparison between
"{}" and "dict()" to confirm it:
>>> timeit.timeit("{}", number=100_000_000)
2.1038335599987477
>>> timeit.timeit("dict()", number=100_000_000)
10.225583500003268
Some more in-depth comparisons might be required for addition of single
items to the containers. I might experiment further with this at some point
in the next week or so, likely with implementing proper tests that omit the
time to initialize the container.
On Mon, Dec 23, 2019 at 10:09 PM Chris Angelico <[email protected]> wrote:
> On Tue, Dec 24, 2019 at 1:57 PM Kyle Stanley <[email protected]> wrote:
> > Add (much faster for dicts):
> > >>> timeit.timeit("s = set(); s.add(0)", number=100_000_000)
> > 13.330938750001224
> > >>> timeit.timeit("d = {}; d[0] = None", number=100_000_000)
> > 5.788865385999088
>
> I think this is an artifact of Python not having an empty set literal.
>
> >>> timeit.timeit("s = set(); s.add(0)", number=100_000_000)
> 13.275540543720126
> >>> timeit.timeit("d = dict(); d[0] = None", number=100_000_000)
> 13.044076398015022
> >>> timeit.timeit("d = {}; d[0] = None", number=100_000_000)
> 6.088695731014013
> >>> timeit.timeit("s = {1}; s.add(0)", number=100_000_000)
> 9.260965215042233
> >>> timeit.timeit("d = {1:2}; d[0] = None", number=100_000_000)
> 8.75433829985559
>
> When both use the constructor call or both use a literal, the
> difference is far smaller. I'd call this one a wash.
>
> ChrisA
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