Radomize secret santa pairings

secret_santa.py

#!/usr/bin/python3
import random

people = [
    "Foo",
    "Bar",
    "Baz",
    "Qux",
    "Quux",
    "Corge",
    "Grault",
    "Garply",
    "Waldo",
    "Fred",
    "Plugh",
    "Xyzzy",
    "Thud",
]


def valid(a, b):
    for i, j in zip(a, b):
        if i == j:
            return False
    return True


givers = list(people)
recipients = list(people)

while not valid(givers, recipients):
    random.shuffle(givers)
    random.shuffle(recipients)

# sort pairings alphabetically with case insensitive
pairings = sorted(
    list(zip(givers, recipients)),
    key=lambda tup: tup[0].casefold()
)
for p in pairings:
    print('%s -> %s' % (p[0], p[1]))