Simple List division problem

[marcstuart]

How do I divide a list into a set group of sublist's- if the list is
not evenly dividable ?
consider this example:

x = [1,2,3,4,5,6,7,8,9,10]
y = 3      # number of lists I want to break x into
z = y/x


what I would like to get is 3 sublists

print z[0] = [1,2,3]
print z[2] = [4,5,6]
print z[3] = [7,8,9,10]

obviously not even, one list will have 4 elements, the other 2 will
have 3.,
the overriding logic, is that I will get 3 lists and find a way for
python to try to break it evenly, if not one list can have a greater
amount of elements

Would I use itertools ? How would I do this ?

Thanks