Mercurial > cpython-lru_cache-weakref
annotate Lib/test/test_xrange.py @ 58925:eecf1bef052d 2.6
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r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line
#7930: fix stripid
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| author | Ezio Melotti <ezio.melotti@gmail.com> |
|---|---|
| date | Tue, 16 Feb 2010 23:29:44 +0000 |
| parents | c217e0331d4b |
| children | b36cb4602e21 |
| rev | line source |
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| 32535 | 1 # Python test set -- built-in functions |
| 2 | |
| 3 import test.test_support, unittest | |
| 4 import sys | |
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5 import pickle |
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6 import itertools |
| 32535 | 7 |
| 8 import warnings | |
| 9 warnings.filterwarnings("ignore", "integer argument expected", | |
| 10 DeprecationWarning, "unittest") | |
| 11 | |
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12 # pure Python implementations (3 args only), for comparison |
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13 def pyrange(start, stop, step): |
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14 if (start - stop) // step < 0: |
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15 # replace stop with next element in the sequence of integers |
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16 # that are congruent to start modulo step. |
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17 stop += (start - stop) % step |
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18 while start != stop: |
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19 yield start |
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20 start += step |
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21 |
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22 def pyrange_reversed(start, stop, step): |
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23 stop += (start - stop) % step |
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24 return pyrange(stop - step, start - step, -step) |
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25 |
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26 |
| 32535 | 27 class XrangeTest(unittest.TestCase): |
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28 def assert_iterators_equal(self, xs, ys, test_id, limit=None): |
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29 # check that an iterator xs matches the expected results ys, |
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30 # up to a given limit. |
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31 if limit is not None: |
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32 xs = itertools.islice(xs, limit) |
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33 ys = itertools.islice(ys, limit) |
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34 sentinel = object() |
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35 pairs = itertools.izip_longest(xs, ys, fillvalue=sentinel) |
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36 for i, (x, y) in enumerate(pairs): |
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37 if x == y: |
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38 continue |
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39 elif x == sentinel: |
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40 self.fail('{0}: iterator ended unexpectedly ' |
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41 'at position {1}; expected {2}'.format(test_id, i, y)) |
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42 elif y == sentinel: |
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43 self.fail('{0}: unexpected excess element {1} at ' |
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44 'position {2}'.format(test_id, x, i)) |
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45 else: |
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46 self.fail('{0}: wrong element at position {1};' |
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47 'expected {2}, got {3}'.format(test_id, i, y, x)) |
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48 |
| 32535 | 49 def test_xrange(self): |
| 50 self.assertEqual(list(xrange(3)), [0, 1, 2]) | |
| 51 self.assertEqual(list(xrange(1, 5)), [1, 2, 3, 4]) | |
| 52 self.assertEqual(list(xrange(0)), []) | |
| 53 self.assertEqual(list(xrange(-3)), []) | |
| 54 self.assertEqual(list(xrange(1, 10, 3)), [1, 4, 7]) | |
| 55 self.assertEqual(list(xrange(5, -5, -3)), [5, 2, -1, -4]) | |
| 56 | |
| 57 a = 10 | |
| 58 b = 100 | |
| 59 c = 50 | |
| 60 | |
| 61 self.assertEqual(list(xrange(a, a+2)), [a, a+1]) | |
| 62 self.assertEqual(list(xrange(a+2, a, -1L)), [a+2, a+1]) | |
| 63 self.assertEqual(list(xrange(a+4, a, -2)), [a+4, a+2]) | |
| 64 | |
| 65 seq = list(xrange(a, b, c)) | |
| 66 self.assert_(a in seq) | |
| 67 self.assert_(b not in seq) | |
| 68 self.assertEqual(len(seq), 2) | |
| 69 | |
| 70 seq = list(xrange(b, a, -c)) | |
| 71 self.assert_(b in seq) | |
| 72 self.assert_(a not in seq) | |
| 73 self.assertEqual(len(seq), 2) | |
| 74 | |
| 75 seq = list(xrange(-a, -b, -c)) | |
| 76 self.assert_(-a in seq) | |
| 77 self.assert_(-b not in seq) | |
| 78 self.assertEqual(len(seq), 2) | |
| 79 | |
| 80 self.assertRaises(TypeError, xrange) | |
| 81 self.assertRaises(TypeError, xrange, 1, 2, 3, 4) | |
| 82 self.assertRaises(ValueError, xrange, 1, 2, 0) | |
| 83 | |
| 84 self.assertRaises(OverflowError, xrange, 1e100, 1e101, 1e101) | |
| 85 | |
| 86 self.assertRaises(TypeError, xrange, 0, "spam") | |
| 87 self.assertRaises(TypeError, xrange, 0, 42, "spam") | |
| 88 | |
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89 self.assertEqual(len(xrange(0, sys.maxint, sys.maxint-1)), 2) |
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90 |
| 32535 | 91 self.assertRaises(OverflowError, xrange, -sys.maxint, sys.maxint) |
| 92 self.assertRaises(OverflowError, xrange, 0, 2*sys.maxint) | |
| 93 | |
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94 r = xrange(-sys.maxint, sys.maxint, 2) |
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95 self.assertEqual(len(r), sys.maxint) |
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96 self.assertRaises(OverflowError, xrange, -sys.maxint-1, sys.maxint, 2) |
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97 |
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98 def test_pickling(self): |
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99 testcases = [(13,), (0, 11), (-22, 10), (20, 3, -1), |
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100 (13, 21, 3), (-2, 2, 2)] |
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101 for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
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102 for t in testcases: |
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103 r = xrange(*t) |
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104 self.assertEquals(list(pickle.loads(pickle.dumps(r, proto))), |
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105 list(r)) |
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106 |
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107 def test_range_iterators(self): |
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108 # see issue 7298 |
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109 limits = [base + jiggle |
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110 for M in (2**32, 2**64) |
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111 for base in (-M, -M//2, 0, M//2, M) |
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112 for jiggle in (-2, -1, 0, 1, 2)] |
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113 test_ranges = [(start, end, step) |
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114 for start in limits |
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115 for end in limits |
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116 for step in (-2**63, -2**31, -2, -1, 1, 2)] |
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117 |
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118 for start, end, step in test_ranges: |
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119 try: |
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120 iter1 = xrange(start, end, step) |
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121 except OverflowError: |
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122 pass |
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123 else: |
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124 iter2 = pyrange(start, end, step) |
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125 test_id = "xrange({0}, {1}, {2})".format(start, end, step) |
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126 # check first 100 entries |
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127 self.assert_iterators_equal(iter1, iter2, test_id, limit=100) |
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128 |
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129 try: |
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130 iter1 = reversed(xrange(start, end, step)) |
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131 except OverflowError: |
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132 pass |
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133 else: |
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134 iter2 = pyrange_reversed(start, end, step) |
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135 test_id = "reversed(xrange({0}, {1}, {2}))".format( |
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136 start, end, step) |
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137 self.assert_iterators_equal(iter1, iter2, test_id, limit=100) |
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138 |
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139 |
| 32535 | 140 def test_main(): |
| 141 test.test_support.run_unittest(XrangeTest) | |
| 142 | |
| 143 if __name__ == "__main__": | |
| 144 test_main() |