teams.py

import random as r

a = [
    ["Yavor Atanasov", "Steve Birks", "Paul Clifford", "Ashley Davis", "Tom Cartwright"],
    ["Richard Close", "Nawaid Shamim", "Pawel Bartoszek", "Daniel Harper"],
    ["Russell Thom", "Tom Petty", "Umesh Telang", "Alistair Wooldrige", "Elliot Thomas"],
    ["Gilbert Agum", "John Shields", "Paul Merry", "Mark Gledhill", "Rachel Evans", "Giovanni Lenguito", "Andre Oosthuizen"]
]

teams = (set(), set(), set())
names = ["Breakery", "LeakyBucket", "CacheMiss"]
r.shuffle(names)

while True:
    if set(map(len, teams)) == {7}:
        break
    for t in teams:
        if len(t) < 7:
            try:
                l = r.choice(range(len(a)))
                t.add(a[l].pop(r.choice(range(len(a[l])))))
            except IndexError:
                a.pop(l)

print "\n".join([
    "{0}: {1}".format(k, ", ".join(v))
    for k, v in dict(zip(names, teams)).items()
])

Is there a python3 version?