combination python

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how to get all possible combinations in python -

all_combinations = [list(zip(each_permutation, list2)) for each_permutation in itertools.permutations(list1, len(list2))]

python combinations -

import itertools
def subs(l):
    res = []
    for i in range(1, len(l) + 1):
        for combo in itertools.combinations(l, i):
            res.append(list(combo))
    return res

python combinations function -

def combinations(iterable, r):
    pool = tuple(iterable)
    n = len(pool)
    for indices in permutations(range(n), r):
        if sorted(indices) == list(indices):
            yield tuple(pool[i] for i in indices)

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