Iterables
=========

cartes
------

Returns the cartesian product of two sequences

Examples::
	>>> from sympy.utilities.iterables import cartes
	>>> cartes([1,2,3], ['a', 'b', 'c'])
	[[1, 'a'],
	[1, 'b'],
	[1, 'c'],
	[2, 'a'],
	[2, 'b'],
	[2, 'c'],
	[3, 'a'],
	[3, 'b'],
	[3, 'c']]



variations
----------

variations(seq, n) Returns all the variations of the list of size n.

Has an optional third argument. Must be a boolean value and makes the method
return the variations with repetition if set to True, or the variations
without repetition if set to False.

Examples::
    >>> from sympy.utilities.iterables import variations
    >>> variations([1,2,3], 2)
    [[1, 2], [1, 3], [2, 1], [2, 3], [3, 1], [3, 2]]
    >>> variations([1,2,3], 2, True)
    [[1, 1], [1, 2], [1, 3], [2, 1], [2, 2], [2, 3], [3, 1], [3, 2], [3, 3]]