Mercurial > cpython-lru_cache-weakref
annotate Lib/test/test_xrange.py @ 79675:c0a2294de787 2.7
Issue #16199: Backport 2to3 typo fix from 3.2.
| author | Chris Jerdonek <chris.jerdonek@gmail.com> |
|---|---|
| date | Thu, 11 Oct 2012 16:15:46 -0700 |
| parents | bff269ee7288 |
| children |
| 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('{}: iterator ended unexpectedly ' |
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41 'at position {}; expected {}'.format(test_id, i, y)) |
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42 elif y == sentinel: |
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43 self.fail('{}: unexpected excess element {} at ' |
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44 'position {}'.format(test_id, x, i)) |
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45 else: |
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46 self.fail('{}: wrong element at position {};' |
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47 'expected {}, got {}'.format(test_id, i, y, x)) |
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48 |
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49 def assert_xranges_equivalent(self, x, y): |
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50 # Check that two xrange objects are equivalent, in the sense of the |
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51 # associated sequences being the same. We want to use this for large |
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52 # xrange objects, so instead of converting to lists and comparing |
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53 # directly we do a number of indirect checks. |
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54 if len(x) != len(y): |
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55 self.fail('{} and {} have different ' |
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56 'lengths: {} and {} '.format(x, y, len(x), len(y))) |
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57 if len(x) >= 1: |
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58 if x[0] != y[0]: |
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59 self.fail('{} and {} have different initial ' |
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60 'elements: {} and {} '.format(x, y, x[0], y[0])) |
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61 if x[-1] != y[-1]: |
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62 self.fail('{} and {} have different final ' |
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63 'elements: {} and {} '.format(x, y, x[-1], y[-1])) |
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64 if len(x) >= 2: |
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65 x_step = x[1] - x[0] |
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66 y_step = y[1] - y[0] |
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67 if x_step != y_step: |
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68 self.fail('{} and {} have different step: ' |
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69 '{} and {} '.format(x, y, x_step, y_step)) |
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70 |
| 32535 | 71 def test_xrange(self): |
| 72 self.assertEqual(list(xrange(3)), [0, 1, 2]) | |
| 73 self.assertEqual(list(xrange(1, 5)), [1, 2, 3, 4]) | |
| 74 self.assertEqual(list(xrange(0)), []) | |
| 75 self.assertEqual(list(xrange(-3)), []) | |
| 76 self.assertEqual(list(xrange(1, 10, 3)), [1, 4, 7]) | |
| 77 self.assertEqual(list(xrange(5, -5, -3)), [5, 2, -1, -4]) | |
| 78 | |
| 79 a = 10 | |
| 80 b = 100 | |
| 81 c = 50 | |
| 82 | |
| 83 self.assertEqual(list(xrange(a, a+2)), [a, a+1]) | |
| 84 self.assertEqual(list(xrange(a+2, a, -1L)), [a+2, a+1]) | |
| 85 self.assertEqual(list(xrange(a+4, a, -2)), [a+4, a+2]) | |
| 86 | |
| 87 seq = list(xrange(a, b, c)) | |
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88 self.assertIn(a, seq) |
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89 self.assertNotIn(b, seq) |
| 32535 | 90 self.assertEqual(len(seq), 2) |
| 91 | |
| 92 seq = list(xrange(b, a, -c)) | |
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93 self.assertIn(b, seq) |
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94 self.assertNotIn(a, seq) |
| 32535 | 95 self.assertEqual(len(seq), 2) |
| 96 | |
| 97 seq = list(xrange(-a, -b, -c)) | |
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98 self.assertIn(-a, seq) |
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99 self.assertNotIn(-b, seq) |
| 32535 | 100 self.assertEqual(len(seq), 2) |
| 101 | |
| 102 self.assertRaises(TypeError, xrange) | |
| 103 self.assertRaises(TypeError, xrange, 1, 2, 3, 4) | |
| 104 self.assertRaises(ValueError, xrange, 1, 2, 0) | |
| 105 | |
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106 self.assertRaises(OverflowError, xrange, 10**100, 10**101, 10**101) |
| 32535 | 107 |
| 108 self.assertRaises(TypeError, xrange, 0, "spam") | |
| 109 self.assertRaises(TypeError, xrange, 0, 42, "spam") | |
| 110 | |
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111 self.assertEqual(len(xrange(0, sys.maxint, sys.maxint-1)), 2) |
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112 |
| 32535 | 113 self.assertRaises(OverflowError, xrange, -sys.maxint, sys.maxint) |
| 114 self.assertRaises(OverflowError, xrange, 0, 2*sys.maxint) | |
| 115 | |
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116 r = xrange(-sys.maxint, sys.maxint, 2) |
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117 self.assertEqual(len(r), sys.maxint) |
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118 self.assertRaises(OverflowError, xrange, -sys.maxint-1, sys.maxint, 2) |
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119 |
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120 def test_pickling(self): |
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121 testcases = [(13,), (0, 11), (-22, 10), (20, 3, -1), |
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122 (13, 21, 3), (-2, 2, 2)] |
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123 for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
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124 for t in testcases: |
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125 r = xrange(*t) |
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126 self.assertEqual(list(pickle.loads(pickle.dumps(r, proto))), |
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127 list(r)) |
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128 |
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129 M = min(sys.maxint, sys.maxsize) |
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130 large_testcases = testcases + [ |
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131 (0, M, 1), |
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132 (M, 0, -1), |
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133 (0, M, M - 1), |
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134 (M // 2, M, 1), |
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135 (0, -M, -1), |
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136 (0, -M, 1 - M), |
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137 (-M, M, 2), |
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138 (-M, M, 1024), |
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139 (-M, M, 10585), |
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140 (M, -M, -2), |
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141 (M, -M, -1024), |
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142 (M, -M, -10585), |
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143 ] |
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144 for proto in range(pickle.HIGHEST_PROTOCOL + 1): |
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145 for t in large_testcases: |
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146 r = xrange(*t) |
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147 r_out = pickle.loads(pickle.dumps(r, proto)) |
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148 self.assert_xranges_equivalent(r_out, r) |
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149 |
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150 def test_repr(self): |
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151 # Check that repr of an xrange is a valid representation |
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152 # of that xrange. |
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153 |
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154 # Valid xranges have at most min(sys.maxint, sys.maxsize) elements. |
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155 M = min(sys.maxint, sys.maxsize) |
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156 |
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157 testcases = [ |
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158 (13,), |
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159 (0, 11), |
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160 (-22, 10), |
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161 (20, 3, -1), |
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162 (13, 21, 3), |
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163 (-2, 2, 2), |
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164 (0, M, 1), |
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165 (M, 0, -1), |
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166 (0, M, M - 1), |
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167 (M // 2, M, 1), |
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168 (0, -M, -1), |
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169 (0, -M, 1 - M), |
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170 (-M, M, 2), |
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171 (-M, M, 1024), |
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172 (-M, M, 10585), |
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173 (M, -M, -2), |
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174 (M, -M, -1024), |
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175 (M, -M, -10585), |
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176 ] |
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177 for t in testcases: |
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178 r = xrange(*t) |
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179 r_out = eval(repr(r)) |
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180 self.assert_xranges_equivalent(r, r_out) |
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181 |
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182 def test_range_iterators(self): |
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183 # see issue 7298 |
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184 limits = [base + jiggle |
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185 for M in (2**32, 2**64) |
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186 for base in (-M, -M//2, 0, M//2, M) |
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187 for jiggle in (-2, -1, 0, 1, 2)] |
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188 test_ranges = [(start, end, step) |
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189 for start in limits |
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190 for end in limits |
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191 for step in (-2**63, -2**31, -2, -1, 1, 2)] |
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192 |
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193 for start, end, step in test_ranges: |
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194 try: |
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195 iter1 = xrange(start, end, step) |
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196 except OverflowError: |
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197 pass |
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198 else: |
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199 iter2 = pyrange(start, end, step) |
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200 test_id = "xrange({}, {}, {})".format(start, end, step) |
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201 # check first 100 entries |
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202 self.assert_iterators_equal(iter1, iter2, test_id, limit=100) |
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203 |
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204 try: |
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205 iter1 = reversed(xrange(start, end, step)) |
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206 except OverflowError: |
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207 pass |
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208 else: |
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209 iter2 = pyrange_reversed(start, end, step) |
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210 test_id = "reversed(xrange({}, {}, {}))".format(start, end, step) |
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211 self.assert_iterators_equal(iter1, iter2, test_id, limit=100) |
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212 |
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213 |
| 32535 | 214 def test_main(): |
| 215 test.test_support.run_unittest(XrangeTest) | |
| 216 | |
| 217 if __name__ == "__main__": | |
| 218 test_main() |