# weighted_random.py

# weighted_random.py

# in this example, weighted['BB'] should be 20x-2x the random chance
# *** {'C': ~100, 'AAA': ~100, 'BB': ~1800}

from random import choice

def weighted_random(z, tries=1):
    weighted = dict((k,0) for k in set(z))
    for _ in range(tries):
        r = choice(z)
        weighted[r] += 1
    return weighted
#
my_list = ['AAA'] + ['BB'] * 20 + ['C']

for _ in range(5):
    results = weighted_random(my_list, 2000)
    print results