def test_join_missing_element():
names = [(1, 'one'), (2, 'two'), (3, 'three')]
fruit = [('apple', 5), ('orange', 1)]
result = set(starmap(add, join(first, names, second, fruit)))
expected = {(1, 'one', 'orange', 1)}
assert result == expected
def test_join():
names = [(1, 'one'), (2, 'two'), (3, 'three')]
fruit = [('apple', 1), ('orange', 1), ('banana', 2), ('coconut', 2)]
def addpair(pair):
return pair[0] + pair[1]
result = set(starmap(add, join(first, names, second, fruit)))
expected = {(1, 'one', 'apple', 1),
(1, 'one', 'orange', 1),
(2, 'two', 'banana', 2),
(2, 'two', 'coconut', 2)}
assert result == expected
result = set(starmap(add, join(first, names, second, fruit,
left_default=no_default2,
right_default=no_default2)))
assert result == expected
def test_join_double_repeats():
names = [(1, 'one'), (2, 'two'), (3, 'three'), (1, 'uno'), (2, 'dos')]
fruit = [('apple', 1), ('orange', 1), ('banana', 2), ('coconut', 2)]
result = set(starmap(add, join(first, names, second, fruit)))
expected = {(1, 'one', 'apple', 1),
(1, 'one', 'orange', 1),
(2, 'two', 'banana', 2),
(2, 'two', 'coconut', 2),
(1, 'uno', 'apple', 1),
(1, 'uno', 'orange', 1),
(2, 'dos', 'banana', 2),
(2, 'dos', 'coconut', 2)}
assert result == expected
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_outer_join():
result = set(join(identity, [1, 2], identity, [2, 3],
left_default=None, right_default=None))
expected = {(2, 2), (1, None), (None, 3)}
assert result == expected