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Try applying on `id`. If `public_subnets` is not an output, then you'll want to do something like (and pardon my Python) `plain_old_list_of_strings = public_subnets.map(lambda id: id.apply(lambda x: x))`

Does this work in Python? In general, if something is an output at a particular depth of code, you shouldn't be able to get the thing inside the output at that level of code, _ever_. You need to access the thing (id, list, whatever) inside an apply, or equivalent.

Outputs are promises of a future value. By definition, the value isn't known at the time the code runs. You can't turn an output into a non-output.