Mercurial > cpython-lru_cache-weakref

annotate Lib/test/seq_tests.py @ 79691:05c8928362ee

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Merge __next__ method link fixes with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 12 Oct 2012 13:46:37 +0300
parents 4ff234337e24
children
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1 """
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2 Tests common to tuple, list and UserList.UserList
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3 """
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4
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5 import unittest
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6 import sys
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7 import pickle
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8
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9 # Various iterables
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10 # This is used for checking the constructor (here and in test_deque.py)
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11 def iterfunc(seqn):
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12 'Regular generator'
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13 for i in seqn:
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14 yield i
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15
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16 class Sequence:
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17 'Sequence using __getitem__'
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18 def __init__(self, seqn):
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19 self.seqn = seqn
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20 def __getitem__(self, i):
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21 return self.seqn[i]
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22
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23 class IterFunc:
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24 'Sequence using iterator protocol'
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25 def __init__(self, seqn):
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26 self.seqn = seqn
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27 self.i = 0
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28 def __iter__(self):
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29 return self
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30 def __next__(self):
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31 if self.i >= len(self.seqn): raise StopIteration
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32 v = self.seqn[self.i]
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33 self.i += 1
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34 return v
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35
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36 class IterGen:
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37 'Sequence using iterator protocol defined with a generator'
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38 def __init__(self, seqn):
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39 self.seqn = seqn
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40 self.i = 0
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41 def __iter__(self):
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42 for val in self.seqn:
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43 yield val
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44
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45 class IterNextOnly:
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46 'Missing __getitem__ and __iter__'
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47 def __init__(self, seqn):
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48 self.seqn = seqn
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49 self.i = 0
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50 def __next__(self):
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51 if self.i >= len(self.seqn): raise StopIteration
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52 v = self.seqn[self.i]
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53 self.i += 1
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54 return v
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55
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56 class IterNoNext:
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57 'Iterator missing __next__()'
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58 def __init__(self, seqn):
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59 self.seqn = seqn
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60 self.i = 0
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61 def __iter__(self):
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62 return self
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63
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64 class IterGenExc:
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65 'Test propagation of exceptions'
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66 def __init__(self, seqn):
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67 self.seqn = seqn
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68 self.i = 0
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69 def __iter__(self):
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70 return self
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71 def __next__(self):
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72 3 // 0
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73
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74 class IterFuncStop:
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75 'Test immediate stop'
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76 def __init__(self, seqn):
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77 pass
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78 def __iter__(self):
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79 return self
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80 def __next__(self):
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81 raise StopIteration
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82
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83 from itertools import chain
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84 def itermulti(seqn):
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85 'Test multiple tiers of iterators'
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86 return chain(map(lambda x:x, iterfunc(IterGen(Sequence(seqn)))))
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87
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88 class CommonTest(unittest.TestCase):
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89 # The type to be tested
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90 type2test = None
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91
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92 def test_constructors(self):
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93 l0 = []
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94 l1 = [0]
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95 l2 = [0, 1]
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96
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97 u = self.type2test()
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98 u0 = self.type2test(l0)
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99 u1 = self.type2test(l1)
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100 u2 = self.type2test(l2)
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101
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102 uu = self.type2test(u)
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103 uu0 = self.type2test(u0)
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104 uu1 = self.type2test(u1)
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105 uu2 = self.type2test(u2)
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106
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107 v = self.type2test(tuple(u))
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108 class OtherSeq:
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109 def __init__(self, initseq):
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110 self.__data = initseq
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111 def __len__(self):
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112 return len(self.__data)
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113 def __getitem__(self, i):
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114 return self.__data[i]
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115 s = OtherSeq(u0)
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116 v0 = self.type2test(s)
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117 self.assertEqual(len(v0), len(s))
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118
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119 s = "this is also a sequence"
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120 vv = self.type2test(s)
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121 self.assertEqual(len(vv), len(s))
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122
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123 # Create from various iteratables
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124 for s in ("123", "", range(1000), ('do', 1.2), range(2000,2200,5)):
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125 for g in (Sequence, IterFunc, IterGen,
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126 itermulti, iterfunc):
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127 self.assertEqual(self.type2test(g(s)), self.type2test(s))
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128 self.assertEqual(self.type2test(IterFuncStop(s)), self.type2test())
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129 self.assertEqual(self.type2test(c for c in "123"), self.type2test("123"))
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130 self.assertRaises(TypeError, self.type2test, IterNextOnly(s))
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131 self.assertRaises(TypeError, self.type2test, IterNoNext(s))
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132 self.assertRaises(ZeroDivisionError, self.type2test, IterGenExc(s))
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133
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134 def test_truth(self):
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135 self.assertFalse(self.type2test())
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136 self.assertTrue(self.type2test([42]))
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137
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138 def test_getitem(self):
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139 u = self.type2test([0, 1, 2, 3, 4])
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140 for i in range(len(u)):
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141 self.assertEqual(u[i], i)
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142 self.assertEqual(u[int(i)], i)
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143 for i in range(-len(u), -1):
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144 self.assertEqual(u[i], len(u)+i)
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145 self.assertEqual(u[int(i)], len(u)+i)
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146 self.assertRaises(IndexError, u.__getitem__, -len(u)-1)
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147 self.assertRaises(IndexError, u.__getitem__, len(u))
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148 self.assertRaises(ValueError, u.__getitem__, slice(0,10,0))
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149
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150 u = self.type2test()
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151 self.assertRaises(IndexError, u.__getitem__, 0)
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152 self.assertRaises(IndexError, u.__getitem__, -1)
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153
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154 self.assertRaises(TypeError, u.__getitem__)
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155
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156 a = self.type2test([10, 11])
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157 self.assertEqual(a[0], 10)
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158 self.assertEqual(a[1], 11)
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159 self.assertEqual(a[-2], 10)
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160 self.assertEqual(a[-1], 11)
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161 self.assertRaises(IndexError, a.__getitem__, -3)
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162 self.assertRaises(IndexError, a.__getitem__, 3)
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163
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164 def test_getslice(self):
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165 l = [0, 1, 2, 3, 4]
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166 u = self.type2test(l)
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167
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168 self.assertEqual(u[0:0], self.type2test())
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169 self.assertEqual(u[1:2], self.type2test([1]))
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170 self.assertEqual(u[-2:-1], self.type2test([3]))
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171 self.assertEqual(u[-1000:1000], u)
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172 self.assertEqual(u[1000:-1000], self.type2test([]))
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173 self.assertEqual(u[:], u)
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174 self.assertEqual(u[1:None], self.type2test([1, 2, 3, 4]))
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175 self.assertEqual(u[None:3], self.type2test([0, 1, 2]))
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176
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177 # Extended slices
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178 self.assertEqual(u[::], u)
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179 self.assertEqual(u[::2], self.type2test([0, 2, 4]))
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180 self.assertEqual(u[1::2], self.type2test([1, 3]))
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181 self.assertEqual(u[::-1], self.type2test([4, 3, 2, 1, 0]))
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182 self.assertEqual(u[::-2], self.type2test([4, 2, 0]))
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183 self.assertEqual(u[3::-2], self.type2test([3, 1]))
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184 self.assertEqual(u[3:3:-2], self.type2test([]))
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185 self.assertEqual(u[3:2:-2], self.type2test([3]))
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186 self.assertEqual(u[3:1:-2], self.type2test([3]))
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187 self.assertEqual(u[3:0:-2], self.type2test([3, 1]))
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188 self.assertEqual(u[::-100], self.type2test([4]))
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189 self.assertEqual(u[100:-100:], self.type2test([]))
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190 self.assertEqual(u[-100:100:], u)
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191 self.assertEqual(u[100:-100:-1], u[::-1])
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192 self.assertEqual(u[-100:100:-1], self.type2test([]))
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193 self.assertEqual(u[-100:100:2], self.type2test([0, 2, 4]))
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194
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195 # Test extreme cases with long ints
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196 a = self.type2test([0,1,2,3,4])
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197 self.assertEqual(a[ -pow(2,128): 3 ], self.type2test([0,1,2]))
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198 self.assertEqual(a[ 3: pow(2,145) ], self.type2test([3,4]))
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199
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200 def test_contains(self):
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201 u = self.type2test([0, 1, 2])
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202 for i in u:
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203 self.assertIn(i, u)
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204 for i in min(u)-1, max(u)+1:
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205 self.assertNotIn(i, u)
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206
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207 self.assertRaises(TypeError, u.__contains__)
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208
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209 def test_contains_fake(self):
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210 class AllEq:
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211 # Sequences must use rich comparison against each item
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212 # (unless "is" is true, or an earlier item answered)
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213 # So instances of AllEq must be found in all non-empty sequences.
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214 def __eq__(self, other):
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215 return True
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216 __hash__ = None # Can't meet hash invariant requirements
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217 self.assertNotIn(AllEq(), self.type2test([]))
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218 self.assertIn(AllEq(), self.type2test([1]))
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219
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220 def test_contains_order(self):
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221 # Sequences must test in-order. If a rich comparison has side
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222 # effects, these will be visible to tests against later members.
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223 # In this test, the "side effect" is a short-circuiting raise.
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224 class DoNotTestEq(Exception):
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225 pass
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226 class StopCompares:
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227 def __eq__(self, other):
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228 raise DoNotTestEq
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229
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230 checkfirst = self.type2test([1, StopCompares()])
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231 self.assertIn(1, checkfirst)
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232 checklast = self.type2test([StopCompares(), 1])
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233 self.assertRaises(DoNotTestEq, checklast.__contains__, 1)
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234
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235 def test_len(self):
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236 self.assertEqual(len(self.type2test()), 0)
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237 self.assertEqual(len(self.type2test([])), 0)
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238 self.assertEqual(len(self.type2test([0])), 1)
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239 self.assertEqual(len(self.type2test([0, 1, 2])), 3)
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240
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241 def test_minmax(self):
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242 u = self.type2test([0, 1, 2])
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243 self.assertEqual(min(u), 0)
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244 self.assertEqual(max(u), 2)
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245
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246 def test_addmul(self):
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247 u1 = self.type2test([0])
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248 u2 = self.type2test([0, 1])
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249 self.assertEqual(u1, u1 + self.type2test())
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250 self.assertEqual(u1, self.type2test() + u1)
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251 self.assertEqual(u1 + self.type2test([1]), u2)
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252 self.assertEqual(self.type2test([-1]) + u1, self.type2test([-1, 0]))
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253 self.assertEqual(self.type2test(), u2*0)
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254 self.assertEqual(self.type2test(), 0*u2)
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255 self.assertEqual(self.type2test(), u2*0)
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256 self.assertEqual(self.type2test(), 0*u2)
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257 self.assertEqual(u2, u2*1)
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258 self.assertEqual(u2, 1*u2)
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259 self.assertEqual(u2, u2*1)
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260 self.assertEqual(u2, 1*u2)
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261 self.assertEqual(u2+u2, u2*2)
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262 self.assertEqual(u2+u2, 2*u2)
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263 self.assertEqual(u2+u2, u2*2)
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264 self.assertEqual(u2+u2, 2*u2)
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265 self.assertEqual(u2+u2+u2, u2*3)
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266 self.assertEqual(u2+u2+u2, 3*u2)
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267
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268 class subclass(self.type2test):
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269 pass
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270 u3 = subclass([0, 1])
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271 self.assertEqual(u3, u3*1)
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272 self.assertIsNot(u3, u3*1)
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273
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274 def test_iadd(self):
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275 u = self.type2test([0, 1])
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276 u += self.type2test()
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277 self.assertEqual(u, self.type2test([0, 1]))
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278 u += self.type2test([2, 3])
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279 self.assertEqual(u, self.type2test([0, 1, 2, 3]))
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280 u += self.type2test([4, 5])
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281 self.assertEqual(u, self.type2test([0, 1, 2, 3, 4, 5]))
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282
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283 u = self.type2test("spam")
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284 u += self.type2test("eggs")
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285 self.assertEqual(u, self.type2test("spameggs"))
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286
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287 def test_imul(self):
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288 u = self.type2test([0, 1])
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289 u *= 3
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290 self.assertEqual(u, self.type2test([0, 1, 0, 1, 0, 1]))
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291
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292 def test_getitemoverwriteiter(self):
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293 # Verify that __getitem__ overrides are not recognized by __iter__
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294 class T(self.type2test):
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295 def __getitem__(self, key):
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296 return str(key) + '!!!'
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297 self.assertEqual(next(iter(T((1,2)))), 1)
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298
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299 def test_repeat(self):
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300 for m in range(4):
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301 s = tuple(range(m))
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302 for n in range(-3, 5):
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303 self.assertEqual(self.type2test(s*n), self.type2test(s)*n)
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304 self.assertEqual(self.type2test(s)*(-4), self.type2test([]))
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305 self.assertEqual(id(s), id(s*1))
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306
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307 def test_bigrepeat(self):
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308 import sys
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309 if sys.maxsize <= 2147483647:
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310 x = self.type2test([0])
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311 x *= 2**16
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312 self.assertRaises(MemoryError, x.__mul__, 2**16)
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313 if hasattr(x, '__imul__'):
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314 self.assertRaises(MemoryError, x.__imul__, 2**16)
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315
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316 def test_subscript(self):
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317 a = self.type2test([10, 11])
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318 self.assertEqual(a.__getitem__(0), 10)
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319 self.assertEqual(a.__getitem__(1), 11)
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320 self.assertEqual(a.__getitem__(-2), 10)
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321 self.assertEqual(a.__getitem__(-1), 11)
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322 self.assertRaises(IndexError, a.__getitem__, -3)
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323 self.assertRaises(IndexError, a.__getitem__, 3)
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324 self.assertEqual(a.__getitem__(slice(0,1)), self.type2test([10]))
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325 self.assertEqual(a.__getitem__(slice(1,2)), self.type2test([11]))
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326 self.assertEqual(a.__getitem__(slice(0,2)), self.type2test([10, 11]))
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327 self.assertEqual(a.__getitem__(slice(0,3)), self.type2test([10, 11]))
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328 self.assertEqual(a.__getitem__(slice(3,5)), self.type2test([]))
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329 self.assertRaises(ValueError, a.__getitem__, slice(0, 10, 0))
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330 self.assertRaises(TypeError, a.__getitem__, 'x')
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331
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332 def test_count(self):
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333 a = self.type2test([0, 1, 2])*3
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334 self.assertEqual(a.count(0), 3)
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335 self.assertEqual(a.count(1), 3)
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336 self.assertEqual(a.count(3), 0)
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337
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338 self.assertRaises(TypeError, a.count)
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339
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340 class BadExc(Exception):
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341 pass
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342
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343 class BadCmp:
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344 def __eq__(self, other):
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345 if other == 2:
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346 raise BadExc()
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347 return False
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348
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349 self.assertRaises(BadExc, a.count, BadCmp())
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350
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351 def test_index(self):
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352 u = self.type2test([0, 1])
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353 self.assertEqual(u.index(0), 0)
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354 self.assertEqual(u.index(1), 1)
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355 self.assertRaises(ValueError, u.index, 2)
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356
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357 u = self.type2test([-2, -1, 0, 0, 1, 2])
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358 self.assertEqual(u.count(0), 2)
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359 self.assertEqual(u.index(0), 2)
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360 self.assertEqual(u.index(0, 2), 2)
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361 self.assertEqual(u.index(-2, -10), 0)
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362 self.assertEqual(u.index(0, 3), 3)
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363 self.assertEqual(u.index(0, 3, 4), 3)
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364 self.assertRaises(ValueError, u.index, 2, 0, -10)
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365
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366 self.assertRaises(TypeError, u.index)
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367
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368 class BadExc(Exception):
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369 pass
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370
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371 class BadCmp:
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372 def __eq__(self, other):
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373 if other == 2:
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374 raise BadExc()
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375 return False
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376
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377 a = self.type2test([0, 1, 2, 3])
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378 self.assertRaises(BadExc, a.index, BadCmp())
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379
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380 a = self.type2test([-2, -1, 0, 0, 1, 2])
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381 self.assertEqual(a.index(0), 2)
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382 self.assertEqual(a.index(0, 2), 2)
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383 self.assertEqual(a.index(0, -4), 2)
063d022ac011 Issue 2025: Add index() and count() methods to tuple so that it will follow
Raymond Hettinger <python@rcn.com>
parents: 43877
diff changeset
384 self.assertEqual(a.index(-2, -10), 0)
063d022ac011 Issue 2025: Add index() and count() methods to tuple so that it will follow
Raymond Hettinger <python@rcn.com>
parents: 43877
diff changeset
385 self.assertEqual(a.index(0, 3), 3)
063d022ac011 Issue 2025: Add index() and count() methods to tuple so that it will follow
Raymond Hettinger <python@rcn.com>
parents: 43877
diff changeset
386 self.assertEqual(a.index(0, -3), 3)
063d022ac011 Issue 2025: Add index() and count() methods to tuple so that it will follow
Raymond Hettinger <python@rcn.com>
parents: 43877
diff changeset
387 self.assertEqual(a.index(0, 3, 4), 3)
063d022ac011 Issue 2025: Add index() and count() methods to tuple so that it will follow
Raymond Hettinger <python@rcn.com>
parents: 43877
diff changeset
388 self.assertEqual(a.index(0, -3, -2), 3)
063d022ac011 Issue 2025: Add index() and count() methods to tuple so that it will follow
Raymond Hettinger <python@rcn.com>
parents: 43877
diff changeset
389 self.assertEqual(a.index(0, -4*sys.maxsize, 4*sys.maxsize), 2)
063d022ac011 Issue 2025: Add index() and count() methods to tuple so that it will follow
Raymond Hettinger <python@rcn.com>
parents: 43877
diff changeset
390 self.assertRaises(ValueError, a.index, 0, 4*sys.maxsize,-4*sys.maxsize)
063d022ac011 Issue 2025: Add index() and count() methods to tuple so that it will follow
Raymond Hettinger <python@rcn.com>
parents: 43877
diff changeset
391 self.assertRaises(ValueError, a.index, 2, 0, -10)
76091
4ff234337e24 Issue #14288: Serialization support for builtin iterators.
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 73408
diff changeset
392
4ff234337e24 Issue #14288: Serialization support for builtin iterators.
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 73408
diff changeset
393 def test_pickle(self):
4ff234337e24 Issue #14288: Serialization support for builtin iterators.
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 73408
diff changeset
394 lst = self.type2test([4, 5, 6, 7])
4ff234337e24 Issue #14288: Serialization support for builtin iterators.
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 73408
diff changeset
395 lst2 = pickle.loads(pickle.dumps(lst))
4ff234337e24 Issue #14288: Serialization support for builtin iterators.
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 73408
diff changeset
396 self.assertEqual(lst2, lst)
4ff234337e24 Issue #14288: Serialization support for builtin iterators.
Kristján Valur Jónsson <kristjan@ccpgames.com>
parents: 73408
diff changeset
397 self.assertNotEqual(id(lst2), id(lst))