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snrji
This is the kind of ad-hoc PEP proposal that could be completely avoidable if there was a generic modifier or initialization/declaration construction for declaring a variable as constant. So incredibly simple, so incredibly useful that it's hard to believe that it hasn't been accepted yet (it was proposed).
laurencerowe
A const declaration only ensures that the variable always points to the same object, not that that object is immutable. For instance in JS:

const foo = {};

foo.bar = 1;

snrji
That depends on the language.
lolc
Nice I like having persistent structures available. Then I don't have to safeguared against unintended modifications.