This pattern also nicely expands when you need to select from more than 2 values. And it lets you keep the mapping as a data instead of turning it into logic.

This pattern also nicely expands when you need to select from more than 2 values. And it lets you keep the mapping as a data instead of turning it into logic. {"a": 1, "b": 2}.get(selector(), default_value) for the else-case.