You can use random.sample():

foo, bar, baz = random.sample(l, 3)

I renamed your variable to l because list is a built-in type. Overriding it by accident won't be pretty.

Here's a sample (no bad pun intended):

>>> import random
>>> random.sample(['a', 'b', 'c', 'd', 'e', 'f', 'g'], 3)
['g', 'c', 'e']

You can use random.sample() if you want to pluck out three distinct elements from the list (i.e. foo is never equal to bar, which might not be what you want):

foo, bar, baz = random.sample(l, 3)

I renamed your variable to l because list is a built-in type. Overriding it by accident won't be pretty.