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700 lines
25 KiB
700 lines
25 KiB
# Python test set -- built-in functions
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import unittest
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import sys
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import pickle
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import itertools
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from test.support import ALWAYS_EQ
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# pure Python implementations (3 args only), for comparison
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def pyrange(start, stop, step):
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if (start - stop) // step < 0:
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# replace stop with next element in the sequence of integers
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# that are congruent to start modulo step.
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stop += (start - stop) % step
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while start != stop:
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yield start
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start += step
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def pyrange_reversed(start, stop, step):
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stop += (start - stop) % step
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return pyrange(stop - step, start - step, -step)
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class RangeTest(unittest.TestCase):
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def assert_iterators_equal(self, xs, ys, test_id, limit=None):
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# check that an iterator xs matches the expected results ys,
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# up to a given limit.
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if limit is not None:
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xs = itertools.islice(xs, limit)
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ys = itertools.islice(ys, limit)
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sentinel = object()
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pairs = itertools.zip_longest(xs, ys, fillvalue=sentinel)
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for i, (x, y) in enumerate(pairs):
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if x == y:
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continue
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elif x == sentinel:
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self.fail('{}: iterator ended unexpectedly '
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'at position {}; expected {}'.format(test_id, i, y))
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elif y == sentinel:
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self.fail('{}: unexpected excess element {} at '
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'position {}'.format(test_id, x, i))
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else:
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self.fail('{}: wrong element at position {}; '
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'expected {}, got {}'.format(test_id, i, y, x))
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def test_range(self):
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self.assertEqual(list(range(3)), [0, 1, 2])
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self.assertEqual(list(range(1, 5)), [1, 2, 3, 4])
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self.assertEqual(list(range(0)), [])
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self.assertEqual(list(range(-3)), [])
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self.assertEqual(list(range(1, 10, 3)), [1, 4, 7])
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self.assertEqual(list(range(5, -5, -3)), [5, 2, -1, -4])
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a = 10
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b = 100
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c = 50
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self.assertEqual(list(range(a, a+2)), [a, a+1])
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self.assertEqual(list(range(a+2, a, -1)), [a+2, a+1])
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self.assertEqual(list(range(a+4, a, -2)), [a+4, a+2])
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seq = list(range(a, b, c))
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self.assertIn(a, seq)
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self.assertNotIn(b, seq)
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self.assertEqual(len(seq), 2)
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seq = list(range(b, a, -c))
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self.assertIn(b, seq)
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self.assertNotIn(a, seq)
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self.assertEqual(len(seq), 2)
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seq = list(range(-a, -b, -c))
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self.assertIn(-a, seq)
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self.assertNotIn(-b, seq)
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self.assertEqual(len(seq), 2)
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self.assertRaises(TypeError, range)
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self.assertRaises(TypeError, range, 1, 2, 3, 4)
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self.assertRaises(ValueError, range, 1, 2, 0)
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self.assertRaises(TypeError, range, 0.0, 2, 1)
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self.assertRaises(TypeError, range, 1, 2.0, 1)
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self.assertRaises(TypeError, range, 1, 2, 1.0)
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self.assertRaises(TypeError, range, 1e100, 1e101, 1e101)
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self.assertRaises(TypeError, range, 0, "spam")
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self.assertRaises(TypeError, range, 0, 42, "spam")
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self.assertEqual(len(range(0, sys.maxsize, sys.maxsize-1)), 2)
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r = range(-sys.maxsize, sys.maxsize, 2)
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self.assertEqual(len(r), sys.maxsize)
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def test_range_constructor_error_messages(self):
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with self.assertRaisesRegex(
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TypeError,
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"range expected at least 1 argument, got 0"
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):
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range()
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with self.assertRaisesRegex(
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TypeError,
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"range expected at most 3 arguments, got 6"
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):
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range(1, 2, 3, 4, 5, 6)
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def test_large_operands(self):
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x = range(10**20, 10**20+10, 3)
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self.assertEqual(len(x), 4)
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self.assertEqual(len(list(x)), 4)
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x = range(10**20+10, 10**20, 3)
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self.assertEqual(len(x), 0)
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self.assertEqual(len(list(x)), 0)
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self.assertFalse(x)
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x = range(10**20, 10**20+10, -3)
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self.assertEqual(len(x), 0)
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self.assertEqual(len(list(x)), 0)
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self.assertFalse(x)
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x = range(10**20+10, 10**20, -3)
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self.assertEqual(len(x), 4)
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self.assertEqual(len(list(x)), 4)
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self.assertTrue(x)
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# Now test range() with longs
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for x in [range(-2**100),
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range(0, -2**100),
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range(0, 2**100, -1)]:
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self.assertEqual(list(x), [])
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self.assertFalse(x)
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a = int(10 * sys.maxsize)
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b = int(100 * sys.maxsize)
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c = int(50 * sys.maxsize)
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self.assertEqual(list(range(a, a+2)), [a, a+1])
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self.assertEqual(list(range(a+2, a, -1)), [a+2, a+1])
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self.assertEqual(list(range(a+4, a, -2)), [a+4, a+2])
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seq = list(range(a, b, c))
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self.assertIn(a, seq)
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self.assertNotIn(b, seq)
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self.assertEqual(len(seq), 2)
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self.assertEqual(seq[0], a)
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self.assertEqual(seq[-1], a+c)
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seq = list(range(b, a, -c))
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self.assertIn(b, seq)
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self.assertNotIn(a, seq)
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self.assertEqual(len(seq), 2)
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self.assertEqual(seq[0], b)
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self.assertEqual(seq[-1], b-c)
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seq = list(range(-a, -b, -c))
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self.assertIn(-a, seq)
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self.assertNotIn(-b, seq)
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self.assertEqual(len(seq), 2)
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self.assertEqual(seq[0], -a)
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self.assertEqual(seq[-1], -a-c)
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def test_large_range(self):
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# Check long ranges (len > sys.maxsize)
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# len() is expected to fail due to limitations of the __len__ protocol
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def _range_len(x):
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try:
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length = len(x)
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except OverflowError:
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step = x[1] - x[0]
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length = 1 + ((x[-1] - x[0]) // step)
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return length
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a = -sys.maxsize
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b = sys.maxsize
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expected_len = b - a
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x = range(a, b)
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self.assertIn(a, x)
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self.assertNotIn(b, x)
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self.assertRaises(OverflowError, len, x)
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self.assertTrue(x)
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self.assertEqual(_range_len(x), expected_len)
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self.assertEqual(x[0], a)
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idx = sys.maxsize+1
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self.assertEqual(x[idx], a+idx)
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self.assertEqual(x[idx:idx+1][0], a+idx)
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with self.assertRaises(IndexError):
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x[-expected_len-1]
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with self.assertRaises(IndexError):
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x[expected_len]
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a = 0
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b = 2 * sys.maxsize
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expected_len = b - a
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x = range(a, b)
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self.assertIn(a, x)
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self.assertNotIn(b, x)
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self.assertRaises(OverflowError, len, x)
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self.assertTrue(x)
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self.assertEqual(_range_len(x), expected_len)
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self.assertEqual(x[0], a)
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idx = sys.maxsize+1
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self.assertEqual(x[idx], a+idx)
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self.assertEqual(x[idx:idx+1][0], a+idx)
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with self.assertRaises(IndexError):
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x[-expected_len-1]
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with self.assertRaises(IndexError):
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x[expected_len]
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a = 0
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b = sys.maxsize**10
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c = 2*sys.maxsize
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expected_len = 1 + (b - a) // c
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x = range(a, b, c)
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self.assertIn(a, x)
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self.assertNotIn(b, x)
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self.assertRaises(OverflowError, len, x)
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self.assertTrue(x)
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self.assertEqual(_range_len(x), expected_len)
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self.assertEqual(x[0], a)
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idx = sys.maxsize+1
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self.assertEqual(x[idx], a+(idx*c))
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self.assertEqual(x[idx:idx+1][0], a+(idx*c))
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with self.assertRaises(IndexError):
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x[-expected_len-1]
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with self.assertRaises(IndexError):
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x[expected_len]
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a = sys.maxsize**10
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b = 0
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c = -2*sys.maxsize
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expected_len = 1 + (b - a) // c
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x = range(a, b, c)
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self.assertIn(a, x)
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self.assertNotIn(b, x)
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self.assertRaises(OverflowError, len, x)
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self.assertTrue(x)
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self.assertEqual(_range_len(x), expected_len)
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self.assertEqual(x[0], a)
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idx = sys.maxsize+1
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self.assertEqual(x[idx], a+(idx*c))
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self.assertEqual(x[idx:idx+1][0], a+(idx*c))
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with self.assertRaises(IndexError):
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x[-expected_len-1]
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with self.assertRaises(IndexError):
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x[expected_len]
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def test_invalid_invocation(self):
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self.assertRaises(TypeError, range)
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self.assertRaises(TypeError, range, 1, 2, 3, 4)
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self.assertRaises(ValueError, range, 1, 2, 0)
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a = int(10 * sys.maxsize)
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self.assertRaises(ValueError, range, a, a + 1, int(0))
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self.assertRaises(TypeError, range, 1., 1., 1.)
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self.assertRaises(TypeError, range, 1e100, 1e101, 1e101)
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self.assertRaises(TypeError, range, 0, "spam")
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self.assertRaises(TypeError, range, 0, 42, "spam")
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# Exercise various combinations of bad arguments, to check
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# refcounting logic
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self.assertRaises(TypeError, range, 0.0)
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self.assertRaises(TypeError, range, 0, 0.0)
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self.assertRaises(TypeError, range, 0.0, 0)
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self.assertRaises(TypeError, range, 0.0, 0.0)
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self.assertRaises(TypeError, range, 0, 0, 1.0)
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self.assertRaises(TypeError, range, 0, 0.0, 1)
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self.assertRaises(TypeError, range, 0, 0.0, 1.0)
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self.assertRaises(TypeError, range, 0.0, 0, 1)
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self.assertRaises(TypeError, range, 0.0, 0, 1.0)
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self.assertRaises(TypeError, range, 0.0, 0.0, 1)
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self.assertRaises(TypeError, range, 0.0, 0.0, 1.0)
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def test_index(self):
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u = range(2)
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self.assertEqual(u.index(0), 0)
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self.assertEqual(u.index(1), 1)
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self.assertRaises(ValueError, u.index, 2)
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u = range(-2, 3)
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self.assertEqual(u.count(0), 1)
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self.assertEqual(u.index(0), 2)
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self.assertRaises(TypeError, u.index)
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class BadExc(Exception):
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pass
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class BadCmp:
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def __eq__(self, other):
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if other == 2:
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raise BadExc()
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return False
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a = range(4)
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self.assertRaises(BadExc, a.index, BadCmp())
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a = range(-2, 3)
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self.assertEqual(a.index(0), 2)
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self.assertEqual(range(1, 10, 3).index(4), 1)
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self.assertEqual(range(1, -10, -3).index(-5), 2)
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self.assertEqual(range(10**20).index(1), 1)
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self.assertEqual(range(10**20).index(10**20 - 1), 10**20 - 1)
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self.assertRaises(ValueError, range(1, 2**100, 2).index, 2**87)
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self.assertEqual(range(1, 2**100, 2).index(2**87+1), 2**86)
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self.assertEqual(range(10).index(ALWAYS_EQ), 0)
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def test_user_index_method(self):
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bignum = 2*sys.maxsize
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smallnum = 42
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# User-defined class with an __index__ method
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class I:
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def __init__(self, n):
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self.n = int(n)
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def __index__(self):
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return self.n
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self.assertEqual(list(range(I(bignum), I(bignum + 1))), [bignum])
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self.assertEqual(list(range(I(smallnum), I(smallnum + 1))), [smallnum])
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# User-defined class with a failing __index__ method
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class IX:
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def __index__(self):
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raise RuntimeError
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self.assertRaises(RuntimeError, range, IX())
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# User-defined class with an invalid __index__ method
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class IN:
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def __index__(self):
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return "not a number"
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self.assertRaises(TypeError, range, IN())
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# Test use of user-defined classes in slice indices.
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self.assertEqual(range(10)[:I(5)], range(5))
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with self.assertRaises(RuntimeError):
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range(0, 10)[:IX()]
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with self.assertRaises(TypeError):
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range(0, 10)[:IN()]
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def test_count(self):
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self.assertEqual(range(3).count(-1), 0)
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self.assertEqual(range(3).count(0), 1)
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self.assertEqual(range(3).count(1), 1)
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self.assertEqual(range(3).count(2), 1)
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self.assertEqual(range(3).count(3), 0)
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self.assertIs(type(range(3).count(-1)), int)
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self.assertIs(type(range(3).count(1)), int)
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self.assertEqual(range(10**20).count(1), 1)
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self.assertEqual(range(10**20).count(10**20), 0)
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self.assertEqual(range(3).index(1), 1)
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self.assertEqual(range(1, 2**100, 2).count(2**87), 0)
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self.assertEqual(range(1, 2**100, 2).count(2**87+1), 1)
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self.assertEqual(range(10).count(ALWAYS_EQ), 10)
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self.assertEqual(len(range(sys.maxsize, sys.maxsize+10)), 10)
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def test_repr(self):
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self.assertEqual(repr(range(1)), 'range(0, 1)')
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self.assertEqual(repr(range(1, 2)), 'range(1, 2)')
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self.assertEqual(repr(range(1, 2, 3)), 'range(1, 2, 3)')
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def test_pickling(self):
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testcases = [(13,), (0, 11), (-22, 10), (20, 3, -1),
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(13, 21, 3), (-2, 2, 2), (2**65, 2**65+2)]
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for proto in range(pickle.HIGHEST_PROTOCOL + 1):
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for t in testcases:
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with self.subTest(proto=proto, test=t):
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r = range(*t)
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self.assertEqual(list(pickle.loads(pickle.dumps(r, proto))),
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list(r))
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def test_iterator_pickling(self):
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testcases = [(13,), (0, 11), (-22, 10), (20, 3, -1), (13, 21, 3),
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(-2, 2, 2)]
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for M in 2**31, 2**63:
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testcases += [
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(M-3, M-1), (4*M, 4*M+2),
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(M-2, M-1, 2), (-M+1, -M, -2),
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(1, 2, M-1), (-1, -2, -M),
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(1, M-1, M-1), (-1, -M, -M),
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]
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for proto in range(pickle.HIGHEST_PROTOCOL + 1):
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for t in testcases:
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with self.subTest(proto=proto, t=t):
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it = itorg = iter(range(*t))
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data = list(range(*t))
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d = pickle.dumps(it, proto)
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it = pickle.loads(d)
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self.assertEqual(type(itorg), type(it))
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self.assertEqual(list(it), data)
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it = pickle.loads(d)
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try:
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next(it)
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except StopIteration:
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continue
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d = pickle.dumps(it, proto)
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it = pickle.loads(d)
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self.assertEqual(list(it), data[1:])
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def test_iterator_pickling_overflowing_index(self):
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for proto in range(pickle.HIGHEST_PROTOCOL + 1):
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with self.subTest(proto=proto):
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it = iter(range(2**32 + 2))
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_, _, idx = it.__reduce__()
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self.assertEqual(idx, 0)
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it.__setstate__(2**32 + 1) # undocumented way to set r->index
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_, _, idx = it.__reduce__()
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self.assertEqual(idx, 2**32 + 1)
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d = pickle.dumps(it, proto)
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it = pickle.loads(d)
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self.assertEqual(next(it), 2**32 + 1)
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def test_exhausted_iterator_pickling(self):
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for proto in range(pickle.HIGHEST_PROTOCOL + 1):
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r = range(2**65, 2**65+2)
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i = iter(r)
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while True:
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r = next(i)
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if r == 2**65+1:
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break
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d = pickle.dumps(i, proto)
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i2 = pickle.loads(d)
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self.assertEqual(list(i), [])
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self.assertEqual(list(i2), [])
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def test_large_exhausted_iterator_pickling(self):
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for proto in range(pickle.HIGHEST_PROTOCOL + 1):
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r = range(20)
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i = iter(r)
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while True:
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r = next(i)
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if r == 19:
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break
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d = pickle.dumps(i, proto)
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i2 = pickle.loads(d)
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self.assertEqual(list(i), [])
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self.assertEqual(list(i2), [])
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def test_odd_bug(self):
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# This used to raise a "SystemError: NULL result without error"
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# because the range validation step was eating the exception
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# before NULL was returned.
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with self.assertRaises(TypeError):
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range([], 1, -1)
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def test_types(self):
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# Non-integer objects *equal* to any of the range's items are supposed
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# to be contained in the range.
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self.assertIn(1.0, range(3))
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self.assertIn(True, range(3))
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self.assertIn(1+0j, range(3))
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self.assertIn(ALWAYS_EQ, range(3))
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# Objects are never coerced into other types for comparison.
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class C2:
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def __int__(self): return 1
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def __index__(self): return 1
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self.assertNotIn(C2(), range(3))
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# ..except if explicitly told so.
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self.assertIn(int(C2()), range(3))
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# Check that the range.__contains__ optimization is only
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# used for ints, not for instances of subclasses of int.
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class C3(int):
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def __eq__(self, other): return True
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self.assertIn(C3(11), range(10))
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self.assertIn(C3(11), list(range(10)))
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def test_strided_limits(self):
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r = range(0, 101, 2)
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self.assertIn(0, r)
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self.assertNotIn(1, r)
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self.assertIn(2, r)
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self.assertNotIn(99, r)
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self.assertIn(100, r)
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self.assertNotIn(101, r)
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r = range(0, -20, -1)
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self.assertIn(0, r)
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self.assertIn(-1, r)
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self.assertIn(-19, r)
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self.assertNotIn(-20, r)
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r = range(0, -20, -2)
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self.assertIn(-18, r)
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self.assertNotIn(-19, r)
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self.assertNotIn(-20, r)
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|
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def test_empty(self):
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r = range(0)
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self.assertNotIn(0, r)
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self.assertNotIn(1, r)
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r = range(0, -10)
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self.assertNotIn(0, r)
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self.assertNotIn(-1, r)
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self.assertNotIn(1, r)
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|
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def test_range_iterators(self):
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# exercise 'fast' iterators, that use a rangeiterobject internally.
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# see issue 7298
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limits = [base + jiggle
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for M in (2**32, 2**64)
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for base in (-M, -M//2, 0, M//2, M)
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for jiggle in (-2, -1, 0, 1, 2)]
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test_ranges = [(start, end, step)
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for start in limits
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for end in limits
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for step in (-2**63, -2**31, -2, -1, 1, 2)]
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for start, end, step in test_ranges:
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iter1 = range(start, end, step)
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iter2 = pyrange(start, end, step)
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test_id = "range({}, {}, {})".format(start, end, step)
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# check first 100 entries
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self.assert_iterators_equal(iter1, iter2, test_id, limit=100)
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iter1 = reversed(range(start, end, step))
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iter2 = pyrange_reversed(start, end, step)
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test_id = "reversed(range({}, {}, {}))".format(start, end, step)
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self.assert_iterators_equal(iter1, iter2, test_id, limit=100)
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|
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def test_range_iterators_invocation(self):
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# verify range iterators instances cannot be created by
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# calling their type
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rangeiter_type = type(iter(range(0)))
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self.assertRaises(TypeError, rangeiter_type, 1, 3, 1)
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long_rangeiter_type = type(iter(range(1 << 1000)))
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self.assertRaises(TypeError, long_rangeiter_type, 1, 3, 1)
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|
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def test_slice(self):
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def check(start, stop, step=None):
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i = slice(start, stop, step)
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self.assertEqual(list(r[i]), list(r)[i])
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self.assertEqual(len(r[i]), len(list(r)[i]))
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|
for r in [range(10),
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range(0),
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range(1, 9, 3),
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|
range(8, 0, -3),
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|
range(sys.maxsize+1, sys.maxsize+10),
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|
]:
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check(0, 2)
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check(0, 20)
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check(1, 2)
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check(20, 30)
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|
check(-30, -20)
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|
check(-1, 100, 2)
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|
check(0, -1)
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|
check(-1, -3, -1)
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|
|
|
def test_contains(self):
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|
r = range(10)
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|
self.assertIn(0, r)
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|
self.assertIn(1, r)
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|
self.assertIn(5.0, r)
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|
self.assertNotIn(5.1, r)
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|
self.assertNotIn(-1, r)
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|
self.assertNotIn(10, r)
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|
self.assertNotIn("", r)
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|
r = range(9, -1, -1)
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|
self.assertIn(0, r)
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|
self.assertIn(1, r)
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|
self.assertIn(5.0, r)
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|
self.assertNotIn(5.1, r)
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|
self.assertNotIn(-1, r)
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|
self.assertNotIn(10, r)
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|
self.assertNotIn("", r)
|
|
r = range(0, 10, 2)
|
|
self.assertIn(0, r)
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|
self.assertNotIn(1, r)
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|
self.assertNotIn(5.0, r)
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|
self.assertNotIn(5.1, r)
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|
self.assertNotIn(-1, r)
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|
self.assertNotIn(10, r)
|
|
self.assertNotIn("", r)
|
|
r = range(9, -1, -2)
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|
self.assertNotIn(0, r)
|
|
self.assertIn(1, r)
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|
self.assertIn(5.0, r)
|
|
self.assertNotIn(5.1, r)
|
|
self.assertNotIn(-1, r)
|
|
self.assertNotIn(10, r)
|
|
self.assertNotIn("", r)
|
|
|
|
def test_reverse_iteration(self):
|
|
for r in [range(10),
|
|
range(0),
|
|
range(1, 9, 3),
|
|
range(8, 0, -3),
|
|
range(sys.maxsize+1, sys.maxsize+10),
|
|
]:
|
|
self.assertEqual(list(reversed(r)), list(r)[::-1])
|
|
|
|
def test_issue11845(self):
|
|
r = range(*slice(1, 18, 2).indices(20))
|
|
values = {None, 0, 1, -1, 2, -2, 5, -5, 19, -19,
|
|
20, -20, 21, -21, 30, -30, 99, -99}
|
|
for i in values:
|
|
for j in values:
|
|
for k in values - {0}:
|
|
r[i:j:k]
|
|
|
|
def test_comparison(self):
|
|
test_ranges = [range(0), range(0, -1), range(1, 1, 3),
|
|
range(1), range(5, 6), range(5, 6, 2),
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|
range(5, 7, 2), range(2), range(0, 4, 2),
|
|
range(0, 5, 2), range(0, 6, 2)]
|
|
test_tuples = list(map(tuple, test_ranges))
|
|
|
|
# Check that equality of ranges matches equality of the corresponding
|
|
# tuples for each pair from the test lists above.
|
|
ranges_eq = [a == b for a in test_ranges for b in test_ranges]
|
|
tuples_eq = [a == b for a in test_tuples for b in test_tuples]
|
|
self.assertEqual(ranges_eq, tuples_eq)
|
|
|
|
# Check that != correctly gives the logical negation of ==
|
|
ranges_ne = [a != b for a in test_ranges for b in test_ranges]
|
|
self.assertEqual(ranges_ne, [not x for x in ranges_eq])
|
|
|
|
# Equal ranges should have equal hashes.
|
|
for a in test_ranges:
|
|
for b in test_ranges:
|
|
if a == b:
|
|
self.assertEqual(hash(a), hash(b))
|
|
|
|
# Ranges are unequal to other types (even sequence types)
|
|
self.assertIs(range(0) == (), False)
|
|
self.assertIs(() == range(0), False)
|
|
self.assertIs(range(2) == [0, 1], False)
|
|
|
|
# Huge integers aren't a problem.
|
|
self.assertEqual(range(0, 2**100 - 1, 2),
|
|
range(0, 2**100, 2))
|
|
self.assertEqual(hash(range(0, 2**100 - 1, 2)),
|
|
hash(range(0, 2**100, 2)))
|
|
self.assertNotEqual(range(0, 2**100, 2),
|
|
range(0, 2**100 + 1, 2))
|
|
self.assertEqual(range(2**200, 2**201 - 2**99, 2**100),
|
|
range(2**200, 2**201, 2**100))
|
|
self.assertEqual(hash(range(2**200, 2**201 - 2**99, 2**100)),
|
|
hash(range(2**200, 2**201, 2**100)))
|
|
self.assertNotEqual(range(2**200, 2**201, 2**100),
|
|
range(2**200, 2**201 + 1, 2**100))
|
|
|
|
# Order comparisons are not implemented for ranges.
|
|
with self.assertRaises(TypeError):
|
|
range(0) < range(0)
|
|
with self.assertRaises(TypeError):
|
|
range(0) > range(0)
|
|
with self.assertRaises(TypeError):
|
|
range(0) <= range(0)
|
|
with self.assertRaises(TypeError):
|
|
range(0) >= range(0)
|
|
|
|
|
|
def test_attributes(self):
|
|
# test the start, stop and step attributes of range objects
|
|
self.assert_attrs(range(0), 0, 0, 1)
|
|
self.assert_attrs(range(10), 0, 10, 1)
|
|
self.assert_attrs(range(-10), 0, -10, 1)
|
|
self.assert_attrs(range(0, 10, 1), 0, 10, 1)
|
|
self.assert_attrs(range(0, 10, 3), 0, 10, 3)
|
|
self.assert_attrs(range(10, 0, -1), 10, 0, -1)
|
|
self.assert_attrs(range(10, 0, -3), 10, 0, -3)
|
|
self.assert_attrs(range(True), 0, 1, 1)
|
|
self.assert_attrs(range(False, True), 0, 1, 1)
|
|
self.assert_attrs(range(False, True, True), 0, 1, 1)
|
|
|
|
def assert_attrs(self, rangeobj, start, stop, step):
|
|
self.assertEqual(rangeobj.start, start)
|
|
self.assertEqual(rangeobj.stop, stop)
|
|
self.assertEqual(rangeobj.step, step)
|
|
self.assertIs(type(rangeobj.start), int)
|
|
self.assertIs(type(rangeobj.stop), int)
|
|
self.assertIs(type(rangeobj.step), int)
|
|
|
|
with self.assertRaises(AttributeError):
|
|
rangeobj.start = 0
|
|
with self.assertRaises(AttributeError):
|
|
rangeobj.stop = 10
|
|
with self.assertRaises(AttributeError):
|
|
rangeobj.step = 1
|
|
|
|
with self.assertRaises(AttributeError):
|
|
del rangeobj.start
|
|
with self.assertRaises(AttributeError):
|
|
del rangeobj.stop
|
|
with self.assertRaises(AttributeError):
|
|
del rangeobj.step
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|