mirror of https://github.com/python/cpython
164 lines
6.3 KiB
Python
164 lines
6.3 KiB
Python
import traceback
|
|
import unittest
|
|
|
|
from test.support import BrokenIter
|
|
|
|
# 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)
|
|
|
|
def test_exception_locations(self):
|
|
# The location of an exception raised from __init__ or
|
|
# __next__ should should be the iterator expression
|
|
def init_raises():
|
|
try:
|
|
{x:x for x in BrokenIter(init_raises=True)}
|
|
except Exception as e:
|
|
return e
|
|
|
|
def next_raises():
|
|
try:
|
|
{x:x for x in BrokenIter(next_raises=True)}
|
|
except Exception as e:
|
|
return e
|
|
|
|
for func, expected in [(init_raises, "BrokenIter(init_raises=True)"),
|
|
(next_raises, "BrokenIter(next_raises=True)"),
|
|
]:
|
|
with self.subTest(func):
|
|
exc = func()
|
|
f = traceback.extract_tb(exc.__traceback__)[0]
|
|
indent = 16
|
|
co = func.__code__
|
|
self.assertEqual(f.lineno, co.co_firstlineno + 2)
|
|
self.assertEqual(f.end_lineno, co.co_firstlineno + 2)
|
|
self.assertEqual(f.line[f.colno - indent : f.end_colno - indent],
|
|
expected)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|