def permutations(lst, result=[]):
if len(lst) == 0:
print(result)
else:
for i in range(len(lst)):
permutations(lst[:i] + lst[i + 1:], result + lst[i:i + 1])
permutations([1, 2, 3])
'''
run:
[1, 2, 3]
[1, 3, 2]
[2, 1, 3]
[2, 3, 1]
[3, 1, 2]
[3, 2, 1]
'''