[Python-ideas] frozenset literals

[Nick Coghlan]

FWIW, I could personally tolerate the introduction of s{} and fs{}
literals. We'd just declare the "s" prefix optional for non-empty sets to
match the current rules.

Encouraging the use of ast.literal_eval() over the security nightmare that
is eval() would be more than enough justification for me. (As a syntax
change, the idea would still need a PEP, though)

Cheers,
Nick.
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