python permutation

# A Python program to print all permutations using library function 
from itertools import permutations
perm = permutations([1, 2, 3])
for i in list(perm):
    print (i)
# (1, 2, 3)
# (1, 3, 2)
# (2, 1, 3)
# (2, 3, 1)
# (3, 1, 2)
# (3, 2, 1)

4.43
6
Awgiedawgie 440220 points

                                    import itertools
print(list(itertools.permutations([1,2,3])))

4.43 (7 Votes)
0
3.89
9
Awgiedawgie 440220 points

                                    def permutations(iterable, r=None):
    # permutations('ABCD', 2) --> AB AC AD BA BC BD CA CB CD DA DB DC
    # permutations(range(3)) --> 012 021 102 120 201 210
    pool = tuple(iterable)
    n = len(pool)
    r = n if r is None else r
    if r > n:
        return
    indices = list(range(n))
    cycles = list(range(n, n-r, -1))
    yield tuple(pool[i] for i in indices[:r])
    while n:
        for i in reversed(range(r)):
            cycles[i] -= 1
            if cycles[i] == 0:
                indices[i:] = indices[i+1:] + indices[i:i+1]
                cycles[i] = n - i
            else:
                j = cycles[i]
                indices[i], indices[-j] = indices[-j], indices[i]
                yield tuple(pool[i] for i in indices[:r])
                break
        else:
            return
print ( list(permutations([1, 2, 3], 2)) )
# [(1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]

3.89 (9 Votes)
0
4.17
6
Phoenix Logan 186120 points

                                    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)

4.17 (6 Votes)
0
4.5
6
Awgiedawgie 440220 points

                                    import itertools

a = [1, 2, 3]
n = 3

perm_iterator = itertools.permutations(a, n)

for item in perm_iterator:
    print(item)

4.5 (6 Votes)
0
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