On Wed, Oct 7, 2020 at 2:08 AM Jonathan Fine email@example.com wrote:
Aside. Please treat this as a semantic problem, or in other words assume that >>> x[SOMETHING] >>> f(SOMETHING) impose the same constraint on a well-formed expression SOMETHING.
Be aware that this isn't an "expression" in the technical sense. You can't put the SOMETHING into a variable and then use that variable in the call or subscript.