def test_key_as_getter():
squares = [(i, i**2) for i in range(5)]
pows = [(i, i**2, i**3) for i in range(5)]
assert set(join(0, squares, 0, pows)) == set(join(lambda x: x[0], squares,
lambda x: x[0], pows))
get = lambda x: (x[0], x[1])
assert set(join([0, 1], squares, [0, 1], pows)) == set(join(get, squares,
get, pows))
get = lambda x: (x[0],)
assert set(join([0], squares, [0], pows)) == set(join(get, squares,
get, pows))
def test_mapcat():
assert (list(mapcat(identity, [[1, 2, 3], [4, 5, 6]])) ==
[1, 2, 3, 4, 5, 6])
assert (list(mapcat(reversed, [[3, 2, 1, 0], [6, 5, 4], [9, 8, 7]])) ==
list(range(10)))
inc = lambda i: i + 1
assert ([4, 5, 6, 7, 8, 9] ==
list(mapcat(partial(map, inc), [[3, 4, 5], [6, 7, 8]])))
def test_partition_all():
assert list(partition_all(2, [1, 2, 3, 4])) == [(1, 2), (3, 4)]
assert list(partition_all(3, range(5))) == [(0, 1, 2), (3, 4)]
assert list(partition_all(2, [])) == []
# Regression test: https://github.com/pytoolz/toolz/issues/387
class NoCompare(object):
def __eq__(self, other):
if self.__class__ == other.__class__:
return True
raise ValueError()
obj = NoCompare()
result = [(obj, obj, obj, obj), (obj, obj, obj)]
assert list(partition_all(4, [obj]*7)) == result
assert list(partition_all(4, iter([obj]*7))) == result
def test_random_sample():
alist = list(range(100))
assert list(random_sample(prob=1, seq=alist, random_state=2016)) == alist
mk_rsample = lambda rs=1: list(random_sample(prob=0.1,
seq=alist,
random_state=rs))
rsample1 = mk_rsample()
assert rsample1 == mk_rsample()
rsample2 = mk_rsample(1984)
randobj = Random(1984)
assert rsample2 == mk_rsample(randobj)
assert rsample1 != rsample2
assert mk_rsample(object) == mk_rsample(object)
assert mk_rsample(object) != mk_rsample(object())
assert mk_rsample(b"a") == mk_rsample(u"a")
assert raises(TypeError, lambda: mk_rsample([]))
def test_remove():
r = remove(iseven, range(5))
assert type(r) is not list
assert list(r) == list(filter(isodd, range(5)))
def test_partition():
assert list(partition(2, [1, 2, 3, 4])) == [(1, 2), (3, 4)]
assert list(partition(3, range(7))) == [(0, 1, 2), (3, 4, 5)]
assert list(partition(3, range(4), pad=-1)) == [(0, 1, 2),
(3, -1, -1)]
assert list(partition(2, [])) == []
def test_interpose():
assert "a" == first(rest(interpose("a", range(1000000000))))
assert "tXaXrXzXaXn" == "".join(interpose("X", "tarzan"))
assert list(interpose(0, itertools.repeat(1, 4))) == [1, 0, 1, 0, 1, 0, 1]
assert list(interpose('.', ['a', 'b', 'c'])) == ['a', '.', 'b', '.', 'c']
def test_concatv():
assert list(concatv([], [], [])) == []
assert (list(take(5, concatv(['a', 'b'], range(1000000000)))) ==
['a', 'b', 0, 1, 2])