How to create dispatch style lambda function using Python?

Question

If I have the given dispatch-style function to represent a pair, how can I implement the same using a one-line lambda function?

# ADT Level 0 (dispatch-style pair)
def make_pair(x, y):
"""Dispatch-style pair"""
    def dispatch(m):
        if m == 0:
            return x
        elif m == 1:
            return y
    return dispatch

Answer 1

You could do something like:

make_pair = lambda x,y: lambda m: x if m == 0 else y if m == 1 else None

The outer lambda returns an (inner) lambda waiting for an argument m that returns the bound variables in the scope created by the outer.

>>>one_two = make_pair(1, 2)
>>>one_two(1)
2
>>> one_two(2)
>>>