gistfile1.py

def ordered_permutations(words=[]):

	"""


	Retrun a generator which generates permutations of words chosen from each
	set in words.



	Example:

	>>> begin_letters = ['A', 'B', 'C']

	>>> words = [['Albuquerque', 'Animal'], ['Bacon', 'British'],
	... ['Cheese', 'Cat'], ['Egg Nog']]

	>>> for set_ in ordered_permutations(begin_letters, words):

	...		print set_

	...

	('Albuquerque', 'Bacon', 'Cheese')

	('Albuquerque', 'Bacon', 'Cat')

	('Albuquerque', 'British', 'Cheese')

	('Albuquerque', 'British', 'Cat')

	('Animal', 'Bacon', 'Cheese')

	('Animal', 'Bacon', 'Cat')

	('Animal', 'British', 'Cheese')

	('Animal', 'British', 'Cat')



	"""

	return eval('((%s) %s)' % (

		','.join(['x%s' % x for x in xrange(len(words))]),

		' '.join(['for x%s in words[%s]' %

				  (x, x) for x in xrange(len(words))]

		)

	))