_ in the Python interactive shell seems like a good example, it is always the result of the previous statement. It'd also be nice to have some sort of statemen

_ in the Python interactive shell seems like a good example, it is always the result of the previous statement. It'd also be nice to have some sort of statement-scoped variable to help reduce error-prone repetition without polluting the block namespace, as functions often take multiple arguments that are derived from the same intermediate value.