def _crossover_at(seq1, seq2, xovers):
# takes two sequences and a single crossover point or a list of points
if not isinstance(xovers, Iterable):
xovers = [xovers]
cycle_seq = cycle((seq1, seq2))
# iter. of start and stop points for sections
xovers = chain((None,), xovers, (None,))
parent_point_zip = izip(cycle_seq, base.pairs(xovers))
segments = tuple(parent[start_stop[0]:start_stop[1]]
for parent, start_stop in parent_point_zip)
return tuple(chain(*segments))
def test_many_elements(self):
ps = list(base.pairs([x for x in xrange(15)]))
assert_equal(len(ps), 14)
for p in ps:
assert_equal(p[0], p[1] - 1)
def test_one_element(self):
assert_equal(list(base.pairs([1])), [])
def test_tuple(self):
assert_equal(list(base.pairs((1, 2, 3))), [(1, 2), (2, 3)])
def test_empty(self):
assert_equal(list(base.pairs([])), [])
def test_iterable(self):
assert_true(isinstance(base.pairs([1, 2]), collections.Iterable))
def test_many_elements(self):
ps = list(base.pairs([x for x in xrange(15)]))
assert_equal(len(ps), 14)
for p in ps:
assert_equal(p[0], p[1] - 1)
def test_one_element(self):
assert_equal(list(base.pairs([1])), [])
def test_tuple(self):
assert_equal(list(base.pairs((1, 2, 3))), [(1, 2), (2, 3)])
def test_empty(self):
assert_equal(list(base.pairs([])), [])
def test_iterable(self):
assert_true(isinstance(base.pairs([1, 2]), collections.Iterable))
