A switch control structure, as an expression, implemented in python3 without using any control structures.

switch.py

print(
    (
        lambda value, cases, default:
        {
            True: lambda: cases[value],
            False: lambda: default
        }[value in cases]()
    )(
        int(input()), {1: 'case 1', 2: 'case 2', 3: 'case 3'}, 'default'
    )
)