https://io.hsoub.com/go/27863

perm.py

#!/usr/bin/env python

import sys

def permutations(input):
	possibilities = set()

	def _perm(prev, rem):
		if len(rem):
			for i in range(len(rem)):
				_perm(prev + list(rem[i]), rem[0:i] + rem[i+1:])
		else:
			possibilities.add(''.join(prev))
	
	_perm([], list(input))
	return (possibilities)
			
if __name__ == "__main__":
	if len(sys.argv) >= 2:
		for i in sys.argv[1:]:
			print("{}: {}".format(i, ' '.join(permutations(i))))
			
	else:
		print("Usage: python perm.py STRING [STRING ..]")