>>> from grapevine import *
>>> ('foo', 'bar', 'quux') | select[-2:] | tuple
('bar', 'quux')
>>> sum(xrange(100) | select[i] | tuple != (range(100)[i],) for i in xrange(-3, 4))
0
>>> sum(xrange(100) | select[i:j:k] | list != range(100)[i:j:k] for i in xrange(-3, 4) for j in xrange(-3, 4) for k in xrange(-3, 4) if k != 0)
0