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#!/usr/bin/env python
#
# perm.py - print all possible permutations of a word
#
# Copyright 2009 Tobias Klauser <tklauser@distanz.ch>
#
# "THE BEER-WARE LICENSE" (Revision 42):
# <tklauser@distanz.ch> wrote this file. As long as you retain this notice you
# can do whatever you want with this stuff. If we meet some day, and you think
# this stuff is worth it, you can buy me a beer in return
# Tobias Klauser
from __future__ import generators
import sys, os
def usage():
print "usage: %s WORD..." % (os.path.basename(sys.argv[0]))
def xcombinations(items, n):
if n==0:
yield []
else:
for i in xrange(len(items)):
for cc in xcombinations(items[:i] + items[i+1:], n-1):
yield [items[i]] + cc
def xpermutations(items):
return xcombinations(items, len(items))
def main():
if len(sys.argv[1:]) < 1:
usage()
for w in sys.argv[1:]:
print "Permutations of %s:" % w
for p in xpermutations(w): print " %s" % ''.join(p)
if __name__=="__main__":
main()
# vim: expandtab shiftwidth=4
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