How to do dependent nested loop using itertools.product?

Question

for i in range(n):
    for j in range(i + 1, n):

How to do this using itertools.product? It takes a variable number of iterables, but there doesn't seem to be a way to reference one iterable from another.

For example, n=5:

for x in itertools.product(range(5), range(1, 5))

generates

(0, 1)
(0, 2)
(0, 3)
(0, 4)
(1, 1)
...

Note (1, 1) is not supposed to be there.

Answer 1

For a given n

n = 5

for i in range(n):
    for j in range(i + 1, n):
        print((i, j))

Prints:

(0, 1)
(0, 2)
(0, 3)
(0, 4)
(1, 2)
(1, 3)
(1, 4)
(2, 3)
(2, 4)
(3, 4)

This isn't a Cartesian product, which is what itertools.product produces. It is a combination which can be made with itertools.combinations:

from itertools import combinations, product

tups = list(combinations(range(5), r=2))

tups will be:

[(0, 1),
 (0, 2),
 (0, 3),
 (0, 4),
 (1, 2),
 (1, 3),
 (1, 4),
 (2, 3),
 (2, 4),
 (3, 4)]