5
>>> { k: None for k in range(10) }
6
{0: None, 1: None, 2: None, 3: None, 4: None, 5: None, 6: None, 7: None, 8: None, 9: None}
10
>>> { k: k+10 for k in range(10) }
11
{0: 10, 1: 11, 2: 12, 3: 13, 4: 14, 5: 15, 6: 16, 7: 17, 8: 18, 9: 19}
13
>>> g = "Global variable"
14
>>> { k: g for k in range(10) }
15
{0: 'Global variable', 1: 'Global variable', 2: 'Global variable', 3: 'Global variable', 4: 'Global variable', 5: 'Global variable', 6: 'Global variable', 7: 'Global variable', 8: 'Global variable', 9: 'Global variable'}
17
>>> { k: v for k in range(10) for v in range(10) if k == v }
18
{0: 0, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9}
20
>>> { k: v for v in range(10) for k in range(v*9, v*10) }
21
{9: 1, 18: 2, 19: 2, 27: 3, 28: 3, 29: 3, 36: 4, 37: 4, 38: 4, 39: 4, 45: 5, 46: 5, 47: 5, 48: 5, 49: 5, 54: 6, 55: 6, 56: 6, 57: 6, 58: 6, 59: 6, 63: 7, 64: 7, 65: 7, 66: 7, 67: 7, 68: 7, 69: 7, 72: 8, 73: 8, 74: 8, 75: 8, 76: 8, 77: 8, 78: 8, 79: 8, 81: 9, 82: 9, 83: 9, 84: 9, 85: 9, 86: 9, 87: 9, 88: 9, 89: 9}
23
>>> { x: y for y, x in ((1, 2), (3, 4)) } = 5 # doctest: +IGNORE_EXCEPTION_DETAIL
24
Traceback (most recent call last):
28
>>> { x: y for y, x in ((1, 2), (3, 4)) } += 5 # doctest: +IGNORE_EXCEPTION_DETAIL
29
Traceback (most recent call last):
35
__test__ = {'doctests' : doctests}
37
def test_main(verbose=None):
39
from test import support
40
from test import test_dictcomps
41
support.run_doctest(test_dictcomps, verbose)
43
# verify reference counting
44
if verbose and hasattr(sys, "gettotalrefcount"):
47
for i in range(len(counts)):
48
support.run_doctest(test_dictcomps, verbose)
50
counts[i] = sys.gettotalrefcount()
3
from test import support
9
class DictComprehensionTest(unittest.TestCase):
11
def test_basics(self):
12
expected = {0: 10, 1: 11, 2: 12, 3: 13, 4: 14, 5: 15, 6: 16, 7: 17,
14
actual = {k: k + 10 for k in range(10)}
15
self.assertEqual(actual, expected)
17
expected = {0: 0, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9}
18
actual = {k: v for k in range(10) for v in range(10) if k == v}
19
self.assertEqual(actual, expected)
21
def test_scope_isolation(self):
24
expected = {0: None, 1: None, 2: None, 3: None, 4: None, 5: None,
25
6: None, 7: None, 8: None, 9: None}
26
actual = {k: None for k in range(10)}
27
self.assertEqual(actual, expected)
28
self.assertEqual(k, "Local Variable")
30
expected = {9: 1, 18: 2, 19: 2, 27: 3, 28: 3, 29: 3, 36: 4, 37: 4,
31
38: 4, 39: 4, 45: 5, 46: 5, 47: 5, 48: 5, 49: 5, 54: 6,
32
55: 6, 56: 6, 57: 6, 58: 6, 59: 6, 63: 7, 64: 7, 65: 7,
33
66: 7, 67: 7, 68: 7, 69: 7, 72: 8, 73: 8, 74: 8, 75: 8,
34
76: 8, 77: 8, 78: 8, 79: 8, 81: 9, 82: 9, 83: 9, 84: 9,
35
85: 9, 86: 9, 87: 9, 88: 9, 89: 9}
36
actual = {k: v for v in range(10) for k in range(v * 9, v * 10)}
37
self.assertEqual(k, "Local Variable")
38
self.assertEqual(actual, expected)
40
def test_scope_isolation_from_global(self):
41
expected = {0: None, 1: None, 2: None, 3: None, 4: None, 5: None,
42
6: None, 7: None, 8: None, 9: None}
43
actual = {g: None for g in range(10)}
44
self.assertEqual(actual, expected)
45
self.assertEqual(g, "Global variable")
47
expected = {9: 1, 18: 2, 19: 2, 27: 3, 28: 3, 29: 3, 36: 4, 37: 4,
48
38: 4, 39: 4, 45: 5, 46: 5, 47: 5, 48: 5, 49: 5, 54: 6,
49
55: 6, 56: 6, 57: 6, 58: 6, 59: 6, 63: 7, 64: 7, 65: 7,
50
66: 7, 67: 7, 68: 7, 69: 7, 72: 8, 73: 8, 74: 8, 75: 8,
51
76: 8, 77: 8, 78: 8, 79: 8, 81: 9, 82: 9, 83: 9, 84: 9,
52
85: 9, 86: 9, 87: 9, 88: 9, 89: 9}
53
actual = {g: v for v in range(10) for g in range(v * 9, v * 10)}
54
self.assertEqual(g, "Global variable")
55
self.assertEqual(actual, expected)
57
def test_global_visibility(self):
58
expected = {0: 'Global variable', 1: 'Global variable',
59
2: 'Global variable', 3: 'Global variable',
60
4: 'Global variable', 5: 'Global variable',
61
6: 'Global variable', 7: 'Global variable',
62
8: 'Global variable', 9: 'Global variable'}
63
actual = {k: g for k in range(10)}
64
self.assertEqual(actual, expected)
66
def test_local_visibility(self):
68
expected = {0: 'Local variable', 1: 'Local variable',
69
2: 'Local variable', 3: 'Local variable',
70
4: 'Local variable', 5: 'Local variable',
71
6: 'Local variable', 7: 'Local variable',
72
8: 'Local variable', 9: 'Local variable'}
73
actual = {k: v for k in range(10)}
74
self.assertEqual(actual, expected)
75
self.assertEqual(v, "Local variable")
77
def test_illegal_assignment(self):
78
with self.assertRaisesRegex(SyntaxError, "can't assign"):
79
compile("{x: y for y, x in ((1, 2), (3, 4))} = 5", "<test>",
82
with self.assertRaisesRegex(SyntaxError, "can't assign"):
83
compile("{x: y for y, x in ((1, 2), (3, 4))} += 5", "<test>",
53
87
if __name__ == "__main__":
54
test_main(verbose=True)