all permuted multiple combinations af a list of values

pmc.py

import itertools
from more_itertools import powerset
def all_possible_multivalue(*values):
    values_ = list(itertools.permutations(values))
    values = list(set(sum([list(powerset(vv)) for vv in values_], [])))
    return values

print(sorted(all_possible_multivalue(1,2,3,), key=lambda v: (len(v), v,)))                                                  
# [(), (1,), (2,), (3,), (1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2), (1, 2, 3), (1, 3, 2), (2, 1, 3), (2, 3, 1), (3, 1, 2), (3, 2, 1)]