Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
As Steven have noted the compiler-time optimization is not applicable here
because name frozenset is resolved at run-time.
In these cases where a set of constants can be replaced with a frozenset of
constants (in "x in {1,2,3}" and in "for x in {1,2,3}") the compiler does it.
And I don't think there is an issue which is worth changing the language.
Creating a frozenset of constants is pretty rare, and it is even more rare in
tight loops. The most common cases (which are pretty rare anyway) are already
covered.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46393>
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