RFH

'''
Python 3.x solution to puzzle at:
http://programmingpraxis.com/2009/06/16/who-owns-the-zebra/
'''

import itertools

colors = ('yellow', 'blue', 'red', 'ivory', 'green')
nationalities = ('Norwegian', 'Ukranian', 'Englishman', 'Spaniard', 'Japanese')
drinks = ('water', 'tea', 'milk', 'orange juice', 'coffee')
brands = ('Kools', 'Chesterfields', 'Old Gold', 'Lucky Strikes', 'Parliaments')
pets = ('fox', 'horse', 'snails', 'dog', 'zebra')

count = 0  # Count of solutions, just in case there is more than one.

for n in itertools.permutations(nationalities):
    if n.index('Norwegian') != 0:
        continue
    for d in itertools.permutations(drinks):
        if (d.index('milk') != 2 or
            n.index('Ukranian') != d.index('tea')):
            continue
        for c in itertools.permutations(colors):
            if (n.index('Englishman') != c.index('red') or
                d.index('coffee') != c.index('green') or
                c.index('green') != (c.index('ivory') + 1) or
                abs(n.index('Norwegian') - c.index('blue')) != 1):
                continue
            for b in itertools.permutations(brands):
                if (b.index('Kools') != c.index('yellow') or
                    b.index('Lucky Strikes') != d.index('orange juice') or
                    n.index('Japanese') != b.index('Parliaments')):
                    continue
                for p in itertools.permutations(pets):
                    if (n.index('Spaniard') != p.index('dog') or
                        b.index('Old Gold') != p.index('snails') or
                        abs(b.index('Chesterfields') - p.index('fox')) != 1 or
                        abs(b.index('Kools') - p.index('horse')) != 1):
                        continue
                    count +=1
                    print('Solution #', count, ':', sep = '')
                    print('Water drinker: ', n[d.index('water')])
                    print('Zebra owner: ', n[p.index('zebra')])
# End of script.