1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
import unittest
# For scope testing.
g = "Global variable"
class DictComprehensionTest(unittest.TestCase):
def test_basics(self):
expected = {0: 10, 1: 11, 2: 12, 3: 13, 4: 14, 5: 15, 6: 16, 7: 17,
8: 18, 9: 19}
actual = {k: k + 10 for k in range(10)}
self.assertEqual(actual, expected)
expected = {0: 0, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9}
actual = {k: v for k in range(10) for v in range(10) if k == v}
self.assertEqual(actual, expected)
def test_scope_isolation(self):
k = "Local Variable"
expected = {0: None, 1: None, 2: None, 3: None, 4: None, 5: None,
6: None, 7: None, 8: None, 9: None}
actual = {k: None for k in range(10)}
self.assertEqual(actual, expected)
self.assertEqual(k, "Local Variable")
expected = {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}
actual = {k: v for v in range(10) for k in range(v * 9, v * 10)}
self.assertEqual(k, "Local Variable")
self.assertEqual(actual, expected)
def test_scope_isolation_from_global(self):
expected = {0: None, 1: None, 2: None, 3: None, 4: None, 5: None,
6: None, 7: None, 8: None, 9: None}
actual = {g: None for g in range(10)}
self.assertEqual(actual, expected)
self.assertEqual(g, "Global variable")
expected = {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}
actual = {g: v for v in range(10) for g in range(v * 9, v * 10)}
self.assertEqual(g, "Global variable")
self.assertEqual(actual, expected)
def test_global_visibility(self):
expected = {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'}
actual = {k: g for k in range(10)}
self.assertEqual(actual, expected)
def test_local_visibility(self):
v = "Local variable"
expected = {0: 'Local variable', 1: 'Local variable',
2: 'Local variable', 3: 'Local variable',
4: 'Local variable', 5: 'Local variable',
6: 'Local variable', 7: 'Local variable',
8: 'Local variable', 9: 'Local variable'}
actual = {k: v for k in range(10)}
self.assertEqual(actual, expected)
self.assertEqual(v, "Local variable")
def test_illegal_assignment(self):
with self.assertRaisesRegex(SyntaxError, "cannot assign"):
compile("{x: y for y, x in ((1, 2), (3, 4))} = 5", "<test>",
"exec")
with self.assertRaisesRegex(SyntaxError, "illegal expression"):
compile("{x: y for y, x in ((1, 2), (3, 4))} += 5", "<test>",
"exec")
def test_evaluation_order(self):
expected = {
'H': 'W',
'e': 'o',
'l': 'l',
'o': 'd',
}
expected_calls = [
('key', 'H'), ('value', 'W'),
('key', 'e'), ('value', 'o'),
('key', 'l'), ('value', 'r'),
('key', 'l'), ('value', 'l'),
('key', 'o'), ('value', 'd'),
]
actual_calls = []
def add_call(pos, value):
actual_calls.append((pos, value))
return value
actual = {
add_call('key', k): add_call('value', v)
for k, v in zip('Hello', 'World')
}
self.assertEqual(actual, expected)
self.assertEqual(actual_calls, expected_calls)
def test_assignment_idiom_in_comprehensions(self):
expected = {1: 1, 2: 4, 3: 9, 4: 16}
actual = {j: j*j for i in range(4) for j in [i+1]}
self.assertEqual(actual, expected)
expected = {3: 2, 5: 6, 7: 12, 9: 20}
actual = {j+k: j*k for i in range(4) for j in [i+1] for k in [j+1]}
self.assertEqual(actual, expected)
expected = {3: 2, 5: 6, 7: 12, 9: 20}
actual = {j+k: j*k for i in range(4) for j, k in [(i+1, i+2)]}
self.assertEqual(actual, expected)
def test_star_expression(self):
expected = {0: 0, 1: 1, 2: 4, 3: 9}
self.assertEqual({i: i*i for i in [*range(4)]}, expected)
self.assertEqual({i: i*i for i in (*range(4),)}, expected)
if __name__ == "__main__":
unittest.main()
|
