Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_int.py @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 8f28ce7b8e69
children 6768b2350c57
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
46649
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1 import sys
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2
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3 import unittest
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4 from test.test_support import run_unittest, have_unicode
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f0db06f49a4e Issue #3439: add bit_length method to int and long.
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5 import math
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6
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7 L = [
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8 ('0', 0),
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9 ('1', 1),
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10 ('9', 9),
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11 ('10', 10),
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12 ('99', 99),
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13 ('100', 100),
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14 ('314', 314),
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15 (' 314', 314),
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16 ('314 ', 314),
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17 (' \t\t 314 \t\t ', 314),
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18 (repr(sys.maxint), sys.maxint),
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19 (' 1x', ValueError),
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20 (' 1 ', 1),
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21 (' 1\02 ', ValueError),
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22 ('', ValueError),
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23 (' ', ValueError),
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24 (' \t\t ', ValueError)
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25 ]
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26 if have_unicode:
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27 L += [
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28 (unicode('0'), 0),
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29 (unicode('1'), 1),
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30 (unicode('9'), 9),
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31 (unicode('10'), 10),
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32 (unicode('99'), 99),
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33 (unicode('100'), 100),
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34 (unicode('314'), 314),
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35 (unicode(' 314'), 314),
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36 (unicode('\u0663\u0661\u0664 ','raw-unicode-escape'), 314),
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37 (unicode(' \t\t 314 \t\t '), 314),
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38 (unicode(' 1x'), ValueError),
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39 (unicode(' 1 '), 1),
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40 (unicode(' 1\02 '), ValueError),
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41 (unicode(''), ValueError),
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42 (unicode(' '), ValueError),
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43 (unicode(' \t\t '), ValueError),
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44 (unichr(0x200), ValueError),
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45 ]
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46
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47 class IntTestCases(unittest.TestCase):
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48
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49 def test_basic(self):
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50 self.assertEqual(int(314), 314)
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51 self.assertEqual(int(3.14), 3)
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52 self.assertEqual(int(314L), 314)
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53 # Check that conversion from float truncates towards zero
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54 self.assertEqual(int(-3.14), -3)
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55 self.assertEqual(int(3.9), 3)
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56 self.assertEqual(int(-3.9), -3)
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57 self.assertEqual(int(3.5), 3)
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58 self.assertEqual(int(-3.5), -3)
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59 # Different base:
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60 self.assertEqual(int("10",16), 16L)
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61 if have_unicode:
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62 self.assertEqual(int(unicode("10"),16), 16L)
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63 # Test conversion from strings and various anomalies
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64 for s, v in L:
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65 for sign in "", "+", "-":
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66 for prefix in "", " ", "\t", " \t\t ":
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67 ss = prefix + sign + s
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68 vv = v
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69 if sign == "-" and v is not ValueError:
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70 vv = -v
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71 try:
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72 self.assertEqual(int(ss), vv)
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73 except v:
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74 pass
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75
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76 s = repr(-1-sys.maxint)
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77 x = int(s)
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78 self.assertEqual(x+1, -sys.maxint)
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79 self.assert_(isinstance(x, int))
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80 # should return long
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81 self.assertEqual(int(s[1:]), sys.maxint+1)
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82
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83 # should return long
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84 x = int(1e100)
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85 self.assert_(isinstance(x, long))
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86 x = int(-1e100)
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87 self.assert_(isinstance(x, long))
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88
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89
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90 # SF bug 434186: 0x80000000/2 != 0x80000000>>1.
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91 # Worked by accident in Windows release build, but failed in debug build.
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92 # Failed in all Linux builds.
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93 x = -1-sys.maxint
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94 self.assertEqual(x >> 1, x//2)
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95
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96 self.assertRaises(ValueError, int, '123\0')
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97 self.assertRaises(ValueError, int, '53', 40)
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98
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99 # SF bug 1545497: embedded NULs were not detected with
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100 # explicit base
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101 self.assertRaises(ValueError, int, '123\0', 10)
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102 self.assertRaises(ValueError, int, '123\x00 245', 20)
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103
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104 x = int('1' * 600)
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105 self.assert_(isinstance(x, long))
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106
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107 if have_unicode:
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108 x = int(unichr(0x661) * 600)
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109 self.assert_(isinstance(x, long))
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110
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111 self.assertRaises(TypeError, int, 1, 12)
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112
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113 self.assertEqual(int('0123', 0), 83)
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114 self.assertEqual(int('0x123', 16), 291)
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115
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116 # Bug 1679: "0x" is not a valid hex literal
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117 self.assertRaises(ValueError, int, "0x", 16)
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118 self.assertRaises(ValueError, int, "0x", 0)
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119
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120 self.assertRaises(ValueError, int, "0o", 8)
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121 self.assertRaises(ValueError, int, "0o", 0)
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122
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123 self.assertRaises(ValueError, int, "0b", 2)
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124 self.assertRaises(ValueError, int, "0b", 0)
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125
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126
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127 # SF bug 1334662: int(string, base) wrong answers
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128 # Various representations of 2**32 evaluated to 0
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129 # rather than 2**32 in previous versions
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130
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131 self.assertEqual(int('100000000000000000000000000000000', 2), 4294967296L)
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132 self.assertEqual(int('102002022201221111211', 3), 4294967296L)
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133 self.assertEqual(int('10000000000000000', 4), 4294967296L)
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134 self.assertEqual(int('32244002423141', 5), 4294967296L)
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135 self.assertEqual(int('1550104015504', 6), 4294967296L)
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136 self.assertEqual(int('211301422354', 7), 4294967296L)
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137 self.assertEqual(int('40000000000', 8), 4294967296L)
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138 self.assertEqual(int('12068657454', 9), 4294967296L)
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139 self.assertEqual(int('4294967296', 10), 4294967296L)
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140 self.assertEqual(int('1904440554', 11), 4294967296L)
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141 self.assertEqual(int('9ba461594', 12), 4294967296L)
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142 self.assertEqual(int('535a79889', 13), 4294967296L)
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143 self.assertEqual(int('2ca5b7464', 14), 4294967296L)
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144 self.assertEqual(int('1a20dcd81', 15), 4294967296L)
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145 self.assertEqual(int('100000000', 16), 4294967296L)
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146 self.assertEqual(int('a7ffda91', 17), 4294967296L)
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147 self.assertEqual(int('704he7g4', 18), 4294967296L)
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148 self.assertEqual(int('4f5aff66', 19), 4294967296L)
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149 self.assertEqual(int('3723ai4g', 20), 4294967296L)
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150 self.assertEqual(int('281d55i4', 21), 4294967296L)
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151 self.assertEqual(int('1fj8b184', 22), 4294967296L)
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152 self.assertEqual(int('1606k7ic', 23), 4294967296L)
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153 self.assertEqual(int('mb994ag', 24), 4294967296L)
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154 self.assertEqual(int('hek2mgl', 25), 4294967296L)
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155 self.assertEqual(int('dnchbnm', 26), 4294967296L)
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156 self.assertEqual(int('b28jpdm', 27), 4294967296L)
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157 self.assertEqual(int('8pfgih4', 28), 4294967296L)
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158 self.assertEqual(int('76beigg', 29), 4294967296L)
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159 self.assertEqual(int('5qmcpqg', 30), 4294967296L)
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160 self.assertEqual(int('4q0jto4', 31), 4294967296L)
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161 self.assertEqual(int('4000000', 32), 4294967296L)
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162 self.assertEqual(int('3aokq94', 33), 4294967296L)
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163 self.assertEqual(int('2qhxjli', 34), 4294967296L)
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164 self.assertEqual(int('2br45qb', 35), 4294967296L)
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165 self.assertEqual(int('1z141z4', 36), 4294967296L)
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166
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167 # tests with base 0
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168 # this fails on 3.0, but in 2.x the old octal syntax is allowed
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169 self.assertEqual(int(' 0123 ', 0), 83)
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170 self.assertEqual(int(' 0123 ', 0), 83)
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171 self.assertEqual(int('000', 0), 0)
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172 self.assertEqual(int('0o123', 0), 83)
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173 self.assertEqual(int('0x123', 0), 291)
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174 self.assertEqual(int('0b100', 0), 4)
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175 self.assertEqual(int(' 0O123 ', 0), 83)
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176 self.assertEqual(int(' 0X123 ', 0), 291)
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177 self.assertEqual(int(' 0B100 ', 0), 4)
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178
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179 # without base still base 10
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180 self.assertEqual(int('0123'), 123)
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181 self.assertEqual(int('0123', 10), 123)
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182
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183 # tests with prefix and base != 0
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184 self.assertEqual(int('0x123', 16), 291)
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185 self.assertEqual(int('0o123', 8), 83)
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186 self.assertEqual(int('0b100', 2), 4)
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187 self.assertEqual(int('0X123', 16), 291)
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188 self.assertEqual(int('0O123', 8), 83)
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189 self.assertEqual(int('0B100', 2), 4)
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190
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191 # the code has special checks for the first character after the
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192 # type prefix
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193 self.assertRaises(ValueError, int, '0b2', 2)
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194 self.assertRaises(ValueError, int, '0b02', 2)
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195 self.assertRaises(ValueError, int, '0B2', 2)
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196 self.assertRaises(ValueError, int, '0B02', 2)
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197 self.assertRaises(ValueError, int, '0o8', 8)
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198 self.assertRaises(ValueError, int, '0o08', 8)
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199 self.assertRaises(ValueError, int, '0O8', 8)
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200 self.assertRaises(ValueError, int, '0O08', 8)
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201 self.assertRaises(ValueError, int, '0xg', 16)
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202 self.assertRaises(ValueError, int, '0x0g', 16)
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203 self.assertRaises(ValueError, int, '0Xg', 16)
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204 self.assertRaises(ValueError, int, '0X0g', 16)
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205
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206 # SF bug 1334662: int(string, base) wrong answers
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207 # Checks for proper evaluation of 2**32 + 1
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208 self.assertEqual(int('100000000000000000000000000000001', 2), 4294967297L)
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209 self.assertEqual(int('102002022201221111212', 3), 4294967297L)
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210 self.assertEqual(int('10000000000000001', 4), 4294967297L)
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211 self.assertEqual(int('32244002423142', 5), 4294967297L)
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212 self.assertEqual(int('1550104015505', 6), 4294967297L)
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213 self.assertEqual(int('211301422355', 7), 4294967297L)
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214 self.assertEqual(int('40000000001', 8), 4294967297L)
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215 self.assertEqual(int('12068657455', 9), 4294967297L)
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216 self.assertEqual(int('4294967297', 10), 4294967297L)
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217 self.assertEqual(int('1904440555', 11), 4294967297L)
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218 self.assertEqual(int('9ba461595', 12), 4294967297L)
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219 self.assertEqual(int('535a7988a', 13), 4294967297L)
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220 self.assertEqual(int('2ca5b7465', 14), 4294967297L)
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221 self.assertEqual(int('1a20dcd82', 15), 4294967297L)
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222 self.assertEqual(int('100000001', 16), 4294967297L)
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223 self.assertEqual(int('a7ffda92', 17), 4294967297L)
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224 self.assertEqual(int('704he7g5', 18), 4294967297L)
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225 self.assertEqual(int('4f5aff67', 19), 4294967297L)
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226 self.assertEqual(int('3723ai4h', 20), 4294967297L)
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227 self.assertEqual(int('281d55i5', 21), 4294967297L)
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228 self.assertEqual(int('1fj8b185', 22), 4294967297L)
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229 self.assertEqual(int('1606k7id', 23), 4294967297L)
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230 self.assertEqual(int('mb994ah', 24), 4294967297L)
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231 self.assertEqual(int('hek2mgm', 25), 4294967297L)
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232 self.assertEqual(int('dnchbnn', 26), 4294967297L)
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233 self.assertEqual(int('b28jpdn', 27), 4294967297L)
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234 self.assertEqual(int('8pfgih5', 28), 4294967297L)
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235 self.assertEqual(int('76beigh', 29), 4294967297L)
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236 self.assertEqual(int('5qmcpqh', 30), 4294967297L)
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237 self.assertEqual(int('4q0jto5', 31), 4294967297L)
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238 self.assertEqual(int('4000001', 32), 4294967297L)
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239 self.assertEqual(int('3aokq95', 33), 4294967297L)
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240 self.assertEqual(int('2qhxjlj', 34), 4294967297L)
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241 self.assertEqual(int('2br45qc', 35), 4294967297L)
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242 self.assertEqual(int('1z141z5', 36), 4294967297L)
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243
50205
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244 def test_bit_length(self):
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245 tiny = 1e-10
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246 for x in xrange(-65000, 65000):
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247 k = x.bit_length()
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248 # Check equivalence with Python version
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249 self.assertEqual(k, len(bin(x).lstrip('-0b')))
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250 # Behaviour as specified in the docs
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251 if x != 0:
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252 self.assert_(2**(k-1) <= abs(x) < 2**k)
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253 else:
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254 self.assertEqual(k, 0)
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255 # Alternative definition: x.bit_length() == 1 + floor(log_2(x))
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256 if x != 0:
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257 # When x is an exact power of 2, numeric errors can
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258 # cause floor(log(x)/log(2)) to be one too small; for
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259 # small x this can be fixed by adding a small quantity
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260 # to the quotient before taking the floor.
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261 self.assertEqual(k, 1 + math.floor(
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262 math.log(abs(x))/math.log(2) + tiny))
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263
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264 self.assertEqual((0).bit_length(), 0)
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265 self.assertEqual((1).bit_length(), 1)
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266 self.assertEqual((-1).bit_length(), 1)
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267 self.assertEqual((2).bit_length(), 2)
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268 self.assertEqual((-2).bit_length(), 2)
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269 for i in [2, 3, 15, 16, 17, 31, 32, 33, 63, 64]:
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270 a = 2**i
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271 self.assertEqual((a-1).bit_length(), i)
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272 self.assertEqual((1-a).bit_length(), i)
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273 self.assertEqual((a).bit_length(), i+1)
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274 self.assertEqual((-a).bit_length(), i+1)
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275 self.assertEqual((a+1).bit_length(), i+1)
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276 self.assertEqual((-a-1).bit_length(), i+1)
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277
53289
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278 @unittest.skipUnless(float.__getformat__("double").startswith("IEEE"),
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279 "test requires IEEE 754 doubles")
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280 def test_float_conversion(self):
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281 # values exactly representable as floats
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282 exact_values = [-2, -1, 0, 1, 2, 2**52, 2**53-1, 2**53, 2**53+2,
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283 2**53+4, 2**54-4, 2**54-2, 2**63, -2**63, 2**64,
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284 -2**64, 10**20, 10**21, 10**22]
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285 for value in exact_values:
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286 self.assertEqual(int(float(int(value))), value)
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287
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288 # test round-half-to-even
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289 self.assertEqual(int(float(2**53+1)), 2**53)
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290 self.assertEqual(int(float(2**53+2)), 2**53+2)
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291 self.assertEqual(int(float(2**53+3)), 2**53+4)
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292 self.assertEqual(int(float(2**53+5)), 2**53+4)
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293 self.assertEqual(int(float(2**53+6)), 2**53+6)
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294 self.assertEqual(int(float(2**53+7)), 2**53+8)
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295
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296 self.assertEqual(int(float(-2**53-1)), -2**53)
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297 self.assertEqual(int(float(-2**53-2)), -2**53-2)
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298 self.assertEqual(int(float(-2**53-3)), -2**53-4)
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299 self.assertEqual(int(float(-2**53-5)), -2**53-4)
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300 self.assertEqual(int(float(-2**53-6)), -2**53-6)
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301 self.assertEqual(int(float(-2**53-7)), -2**53-8)
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302
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303 self.assertEqual(int(float(2**54-2)), 2**54-2)
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304 self.assertEqual(int(float(2**54-1)), 2**54)
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305 self.assertEqual(int(float(2**54+2)), 2**54)
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306 self.assertEqual(int(float(2**54+3)), 2**54+4)
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307 self.assertEqual(int(float(2**54+5)), 2**54+4)
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308 self.assertEqual(int(float(2**54+6)), 2**54+8)
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309 self.assertEqual(int(float(2**54+10)), 2**54+8)
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310 self.assertEqual(int(float(2**54+11)), 2**54+12)
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311
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312 def test_intconversion(self):
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313 # Test __int__()
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314 class ClassicMissingMethods:
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315 pass
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316 self.assertRaises(AttributeError, int, ClassicMissingMethods())
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317
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318 class MissingMethods(object):
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319 pass
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320 self.assertRaises(TypeError, int, MissingMethods())
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321
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322 class Foo0:
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323 def __int__(self):
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324 return 42
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325
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326 class Foo1(object):
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327 def __int__(self):
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328 return 42
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329
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330 class Foo2(int):
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331 def __int__(self):
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332 return 42
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333
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334 class Foo3(int):
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335 def __int__(self):
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336 return self
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337
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338 class Foo4(int):
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339 def __int__(self):
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340 return 42L
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341
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342 class Foo5(int):
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343 def __int__(self):
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344 return 42.
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345
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346 self.assertEqual(int(Foo0()), 42)
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347 self.assertEqual(int(Foo1()), 42)
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348 self.assertEqual(int(Foo2()), 42)
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349 self.assertEqual(int(Foo3()), 0)
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350 self.assertEqual(int(Foo4()), 42L)
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351 self.assertRaises(TypeError, int, Foo5())
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352
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353 class Classic:
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354 pass
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355 for base in (object, Classic):
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356 class IntOverridesTrunc(base):
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357 def __int__(self):
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358 return 42
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359 def __trunc__(self):
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360 return -12
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361 self.assertEqual(int(IntOverridesTrunc()), 42)
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362
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363 class JustTrunc(base):
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364 def __trunc__(self):
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365 return 42
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366 self.assertEqual(int(JustTrunc()), 42)
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367
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368 for trunc_result_base in (object, Classic):
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369 class Integral(trunc_result_base):
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370 def __int__(self):
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371 return 42
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372
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373 class TruncReturnsNonInt(base):
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374 def __trunc__(self):
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375 return Integral()
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376 self.assertEqual(int(TruncReturnsNonInt()), 42)
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377
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378 class NonIntegral(trunc_result_base):
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379 def __trunc__(self):
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380 # Check that we avoid infinite recursion.
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381 return NonIntegral()
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382
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383 class TruncReturnsNonIntegral(base):
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384 def __trunc__(self):
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385 return NonIntegral()
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386 try:
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387 int(TruncReturnsNonIntegral())
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388 except TypeError as e:
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389 self.assertEquals(str(e),
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390 "__trunc__ returned non-Integral"
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391 " (type NonIntegral)")
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392 else:
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393 self.fail("Failed to raise TypeError with %s" %
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394 ((base, trunc_result_base),))
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395
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396 def test_main():
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397 run_unittest(IntTestCases)
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398
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399 if __name__ == "__main__":
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400 test_main()