On Wed, Jul 11, 2018 at 04:25:56PM -0700, Gregory P. Smith wrote:
> Completely obvious what it does, but it irritates my aesthetic
> sensibilities every time I see:
> frozenset({spam, eggs})
+1 to the idea of a new set method, freeze, returning a frozenset, and
allowing the interpreter to optimize calls like:
{a, b, c}.freeze()
to skip making the temporary set.
I seem to have a vague recollection that there was already a CPython
optimization in place that substitutes a frozenset for certain set
displays... ah yes, here it is:
py> dis.dis("x in {2, 3}")
1 0 LOAD_NAME 0 (x)
3 LOAD_CONST 2 (frozenset({2, 3}))
6 COMPARE_OP 6 (in)
9 RETURN_VALUE
Nice!
--
Steve
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