floorpuzzle.py

#------------------
# User Instructions
#
# Hopper, Kay, Liskov, Perlis, and Ritchie live on 
# different floors of a five-floor apartment building. 
#
# Hopper does not live on the top floor. 
# Kay does not live on the bottom floor. 
# Liskov does not live on either the top or the bottom floor. 
# Perlis lives on a higher floor than does Kay. 
# Ritchie does not live on a floor adjacent to Liskov's. 
# Liskov does not live on a floor adjacent to Kay's. 
# 
# Where does everyone live?  
# 
# Write a function floor_puzzle() that returns a list of
# five floor numbers denoting the floor of Hopper, Kay, 
# Liskov, Perlis, and Ritchie.

import itertools

def adjacent(f1, f2):
    return abs(f1-f2)==1

def floor_puzzle():
    # Your code here
    floors = [bottom, _, _, _, top] = [1,2,3,4,5]
    orderings = list(itertools.permutations(floors))
    for (Hopper, Kay, Liskov, Perlis, Ritchie) in orderings:
        if (Hopper is not top
            and Kay is not bottom
            and Liskov is not top
            and Liskov is not bottom
            and Perlis>Kay
            and not adjacent(Ritchie, Liskov)
            and not adjacent(Liskov, Kay)):
            return [Hopper, Kay, Liskov, Perlis, Ritchie]
                  
def test():
    result = floor_puzzle()
    print(result)
    assert result == [3,2,4,5,1]

test()