$ cat vspike.py
class Person(object):
    def __init__(my, name, orders):
        my.name = name
        my.orders = orders
    def __repr__(my):
        return my.name

people = [
    Person('a', range(3)),
    Person('b', range(10, 13)),
    Person('c', range(20, 23))
]
print [(p, o) for p in people for o in p.orders]
$
$ python vspike.py
[(a, 0), (a, 1), (a, 2), (b, 10), (b, 11), (b, 12), (c, 20), (c, 21), (c, 22)]