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

remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents b0911b5a002e
children 6768b2350c57
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 from collections import deque
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2 import unittest
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3 from test import test_support, seq_tests
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4 import gc
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5 import weakref
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6 import copy
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7 import cPickle as pickle
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8 import random
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9 import os
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10
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11 BIG = 100000
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12
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13 def fail():
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14 raise SyntaxError
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15 yield 1
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16
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17 class BadCmp:
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18 def __eq__(self, other):
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19 raise RuntimeError
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20
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21 class MutateCmp:
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22 def __init__(self, deque, result):
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23 self.deque = deque
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24 self.result = result
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25 def __eq__(self, other):
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26 self.deque.clear()
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27 return self.result
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28
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29 class TestBasic(unittest.TestCase):
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30
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31 def test_basics(self):
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32 d = deque(xrange(-5125, -5000))
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33 d.__init__(xrange(200))
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34 for i in xrange(200, 400):
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35 d.append(i)
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36 for i in reversed(xrange(-200, 0)):
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37 d.appendleft(i)
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38 self.assertEqual(list(d), range(-200, 400))
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39 self.assertEqual(len(d), 600)
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40
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41 left = [d.popleft() for i in xrange(250)]
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42 self.assertEqual(left, range(-200, 50))
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43 self.assertEqual(list(d), range(50, 400))
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44
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45 right = [d.pop() for i in xrange(250)]
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46 right.reverse()
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47 self.assertEqual(right, range(150, 400))
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48 self.assertEqual(list(d), range(50, 150))
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49
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50 def test_maxlen(self):
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51 self.assertRaises(ValueError, deque, 'abc', -1)
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52 self.assertRaises(ValueError, deque, 'abc', -2)
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53 it = iter(range(10))
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54 d = deque(it, maxlen=3)
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55 self.assertEqual(list(it), [])
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56 self.assertEqual(repr(d), 'deque([7, 8, 9], maxlen=3)')
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57 self.assertEqual(list(d), range(7, 10))
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58 self.assertEqual(d, deque(range(10), 3))
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59 d.append(10)
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60 self.assertEqual(list(d), range(8, 11))
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61 d.appendleft(7)
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62 self.assertEqual(list(d), range(7, 10))
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63 d.extend([10, 11])
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64 self.assertEqual(list(d), range(9, 12))
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65 d.extendleft([8, 7])
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66 self.assertEqual(list(d), range(7, 10))
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67 d = deque(xrange(200), maxlen=10)
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68 d.append(d)
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69 test_support.unlink(test_support.TESTFN)
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70 fo = open(test_support.TESTFN, "wb")
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71 try:
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72 print >> fo, d,
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73 fo.close()
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74 fo = open(test_support.TESTFN, "rb")
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75 self.assertEqual(fo.read(), repr(d))
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76 finally:
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77 fo.close()
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78 test_support.unlink(test_support.TESTFN)
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79
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80 d = deque(range(10), maxlen=None)
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81 self.assertEqual(repr(d), 'deque([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])')
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82 fo = open(test_support.TESTFN, "wb")
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83 try:
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84 print >> fo, d,
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85 fo.close()
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86 fo = open(test_support.TESTFN, "rb")
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87 self.assertEqual(fo.read(), repr(d))
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88 finally:
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89 fo.close()
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90 test_support.unlink(test_support.TESTFN)
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91
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92 def test_maxlen_zero(self):
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93 it = iter(range(100))
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94 deque(it, maxlen=0)
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95 self.assertEqual(list(it), [])
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96
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97 it = iter(range(100))
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98 d = deque(maxlen=0)
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99 d.extend(it)
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100 self.assertEqual(list(it), [])
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101
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102 it = iter(range(100))
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103 d = deque(maxlen=0)
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104 d.extendleft(it)
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105 self.assertEqual(list(it), [])
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106
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107 def test_maxlen_attribute(self):
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108 self.assertEqual(deque().maxlen, None)
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109 self.assertEqual(deque('abc').maxlen, None)
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110 self.assertEqual(deque('abc', maxlen=4).maxlen, 4)
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111 self.assertEqual(deque('abc', maxlen=2).maxlen, 2)
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112 self.assertEqual(deque('abc', maxlen=0).maxlen, 0)
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113 with self.assertRaises(AttributeError):
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114 d = deque('abc')
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115 d.maxlen = 10
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116
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117 def test_comparisons(self):
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118 d = deque('xabc'); d.popleft()
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119 for e in [d, deque('abc'), deque('ab'), deque(), list(d)]:
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120 self.assertEqual(d==e, type(d)==type(e) and list(d)==list(e))
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121 self.assertEqual(d!=e, not(type(d)==type(e) and list(d)==list(e)))
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122
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123 args = map(deque, ('', 'a', 'b', 'ab', 'ba', 'abc', 'xba', 'xabc', 'cba'))
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124 for x in args:
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125 for y in args:
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126 self.assertEqual(x == y, list(x) == list(y), (x,y))
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127 self.assertEqual(x != y, list(x) != list(y), (x,y))
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128 self.assertEqual(x < y, list(x) < list(y), (x,y))
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129 self.assertEqual(x <= y, list(x) <= list(y), (x,y))
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130 self.assertEqual(x > y, list(x) > list(y), (x,y))
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131 self.assertEqual(x >= y, list(x) >= list(y), (x,y))
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132 self.assertEqual(cmp(x,y), cmp(list(x),list(y)), (x,y))
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133
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134 def test_extend(self):
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135 d = deque('a')
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136 self.assertRaises(TypeError, d.extend, 1)
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137 d.extend('bcd')
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138 self.assertEqual(list(d), list('abcd'))
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139
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140 def test_extendleft(self):
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141 d = deque('a')
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142 self.assertRaises(TypeError, d.extendleft, 1)
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143 d.extendleft('bcd')
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144 self.assertEqual(list(d), list(reversed('abcd')))
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145 d = deque()
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146 d.extendleft(range(1000))
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147 self.assertEqual(list(d), list(reversed(range(1000))))
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148 self.assertRaises(SyntaxError, d.extendleft, fail())
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149
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150 def test_getitem(self):
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151 n = 200
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152 d = deque(xrange(n))
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153 l = range(n)
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154 for i in xrange(n):
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155 d.popleft()
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156 l.pop(0)
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157 if random.random() < 0.5:
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158 d.append(i)
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159 l.append(i)
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160 for j in xrange(1-len(l), len(l)):
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161 assert d[j] == l[j]
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162
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163 d = deque('superman')
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164 self.assertEqual(d[0], 's')
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165 self.assertEqual(d[-1], 'n')
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166 d = deque()
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167 self.assertRaises(IndexError, d.__getitem__, 0)
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168 self.assertRaises(IndexError, d.__getitem__, -1)
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169
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170 def test_setitem(self):
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171 n = 200
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172 d = deque(xrange(n))
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173 for i in xrange(n):
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174 d[i] = 10 * i
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175 self.assertEqual(list(d), [10*i for i in xrange(n)])
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176 l = list(d)
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177 for i in xrange(1-n, 0, -1):
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178 d[i] = 7*i
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179 l[i] = 7*i
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180 self.assertEqual(list(d), l)
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181
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182 def test_delitem(self):
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183 n = 500 # O(n**2) test, don't make this too big
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184 d = deque(xrange(n))
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185 self.assertRaises(IndexError, d.__delitem__, -n-1)
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186 self.assertRaises(IndexError, d.__delitem__, n)
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187 for i in xrange(n):
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188 self.assertEqual(len(d), n-i)
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189 j = random.randrange(-len(d), len(d))
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190 val = d[j]
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191 self.assert_(val in d)
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192 del d[j]
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193 self.assert_(val not in d)
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194 self.assertEqual(len(d), 0)
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195
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196 def test_rotate(self):
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197 s = tuple('abcde')
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198 n = len(s)
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199
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200 d = deque(s)
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201 d.rotate(1) # verify rot(1)
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202 self.assertEqual(''.join(d), 'eabcd')
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203
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204 d = deque(s)
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205 d.rotate(-1) # verify rot(-1)
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206 self.assertEqual(''.join(d), 'bcdea')
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207 d.rotate() # check default to 1
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208 self.assertEqual(tuple(d), s)
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209
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210 for i in xrange(n*3):
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211 d = deque(s)
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212 e = deque(d)
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213 d.rotate(i) # check vs. rot(1) n times
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214 for j in xrange(i):
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215 e.rotate(1)
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216 self.assertEqual(tuple(d), tuple(e))
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217 d.rotate(-i) # check that it works in reverse
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218 self.assertEqual(tuple(d), s)
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219 e.rotate(n-i) # check that it wraps forward
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220 self.assertEqual(tuple(e), s)
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221
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222 for i in xrange(n*3):
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223 d = deque(s)
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224 e = deque(d)
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225 d.rotate(-i)
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226 for j in xrange(i):
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227 e.rotate(-1) # check vs. rot(-1) n times
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228 self.assertEqual(tuple(d), tuple(e))
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229 d.rotate(i) # check that it works in reverse
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230 self.assertEqual(tuple(d), s)
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231 e.rotate(i-n) # check that it wraps backaround
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232 self.assertEqual(tuple(e), s)
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233
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234 d = deque(s)
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235 e = deque(s)
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236 e.rotate(BIG+17) # verify on long series of rotates
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237 dr = d.rotate
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238 for i in xrange(BIG+17):
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239 dr()
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240 self.assertEqual(tuple(d), tuple(e))
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241
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242 self.assertRaises(TypeError, d.rotate, 'x') # Wrong arg type
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243 self.assertRaises(TypeError, d.rotate, 1, 10) # Too many args
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244
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245 d = deque()
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246 d.rotate() # rotate an empty deque
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247 self.assertEqual(d, deque())
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248
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249 def test_len(self):
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250 d = deque('ab')
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251 self.assertEqual(len(d), 2)
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252 d.popleft()
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253 self.assertEqual(len(d), 1)
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254 d.pop()
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255 self.assertEqual(len(d), 0)
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256 self.assertRaises(IndexError, d.pop)
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257 self.assertEqual(len(d), 0)
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258 d.append('c')
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259 self.assertEqual(len(d), 1)
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260 d.appendleft('d')
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261 self.assertEqual(len(d), 2)
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262 d.clear()
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263 self.assertEqual(len(d), 0)
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264
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265 def test_underflow(self):
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266 d = deque()
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267 self.assertRaises(IndexError, d.pop)
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268 self.assertRaises(IndexError, d.popleft)
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269
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270 def test_clear(self):
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271 d = deque(xrange(100))
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272 self.assertEqual(len(d), 100)
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273 d.clear()
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274 self.assertEqual(len(d), 0)
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275 self.assertEqual(list(d), [])
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276 d.clear() # clear an emtpy deque
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277 self.assertEqual(list(d), [])
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278
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279 def test_remove(self):
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280 d = deque('abcdefghcij')
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281 d.remove('c')
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282 self.assertEqual(d, deque('abdefghcij'))
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283 d.remove('c')
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284 self.assertEqual(d, deque('abdefghij'))
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285 self.assertRaises(ValueError, d.remove, 'c')
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286 self.assertEqual(d, deque('abdefghij'))
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287
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288 # Handle comparison errors
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289 d = deque(['a', 'b', BadCmp(), 'c'])
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290 e = deque(d)
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291 self.assertRaises(RuntimeError, d.remove, 'c')
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292 for x, y in zip(d, e):
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293 # verify that original order and values are retained.
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294 self.assert_(x is y)
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295
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296 # Handle evil mutator
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297 for match in (True, False):
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298 d = deque(['ab'])
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299 d.extend([MutateCmp(d, match), 'c'])
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300 self.assertRaises(IndexError, d.remove, 'c')
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301 self.assertEqual(d, deque())
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302
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303 def test_repr(self):
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304 d = deque(xrange(200))
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305 e = eval(repr(d))
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306 self.assertEqual(list(d), list(e))
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307 d.append(d)
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308 self.assert_('...' in repr(d))
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309
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310 def test_print(self):
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311 d = deque(xrange(200))
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312 d.append(d)
46388
8d555850f73d Remove the test file before writing it in case there is no write permission.
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diff changeset
313 test_support.unlink(test_support.TESTFN)
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f3e648fee4c1 Fix a bunch of UnboundLocalErrors when the tests fail.
Neal Norwitz <nnorwitz@gmail.com>
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diff changeset
314 fo = open(test_support.TESTFN, "wb")
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315 try:
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316 print >> fo, d,
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317 fo.close()
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318 fo = open(test_support.TESTFN, "rb")
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319 self.assertEqual(fo.read(), repr(d))
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diff changeset
320 finally:
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321 fo.close()
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322 test_support.unlink(test_support.TESTFN)
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323
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diff changeset
324 def test_init(self):
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73f49656420b Add __asdict__() to NamedTuple and refine the docs.
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325 self.assertRaises(TypeError, deque, 'abc', 2, 3);
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326 self.assertRaises(TypeError, deque, 1);
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327
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328 def test_hash(self):
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329 self.assertRaises(TypeError, hash, deque('abc'))
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330
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331 def test_long_steadystate_queue_popleft(self):
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332 for size in (0, 1, 2, 100, 1000):
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333 d = deque(xrange(size))
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334 append, pop = d.append, d.popleft
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335 for i in xrange(size, BIG):
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336 append(i)
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337 x = pop()
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338 if x != i - size:
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339 self.assertEqual(x, i-size)
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340 self.assertEqual(list(d), range(BIG-size, BIG))
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341
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342 def test_long_steadystate_queue_popright(self):
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343 for size in (0, 1, 2, 100, 1000):
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344 d = deque(reversed(xrange(size)))
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345 append, pop = d.appendleft, d.pop
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346 for i in xrange(size, BIG):
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347 append(i)
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348 x = pop()
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349 if x != i - size:
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350 self.assertEqual(x, i-size)
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351 self.assertEqual(list(reversed(list(d))), range(BIG-size, BIG))
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352
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353 def test_big_queue_popleft(self):
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354 pass
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355 d = deque()
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356 append, pop = d.append, d.popleft
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357 for i in xrange(BIG):
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358 append(i)
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359 for i in xrange(BIG):
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360 x = pop()
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361 if x != i:
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362 self.assertEqual(x, i)
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363
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364 def test_big_queue_popright(self):
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365 d = deque()
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366 append, pop = d.appendleft, d.pop
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367 for i in xrange(BIG):
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368 append(i)
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369 for i in xrange(BIG):
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370 x = pop()
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371 if x != i:
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372 self.assertEqual(x, i)
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373
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374 def test_big_stack_right(self):
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375 d = deque()
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376 append, pop = d.append, d.pop
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377 for i in xrange(BIG):
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378 append(i)
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379 for i in reversed(xrange(BIG)):
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diff changeset
380 x = pop()
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diff changeset
381 if x != i:
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diff changeset
382 self.assertEqual(x, i)
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383 self.assertEqual(len(d), 0)
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384
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385 def test_big_stack_left(self):
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diff changeset
386 d = deque()
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diff changeset
387 append, pop = d.appendleft, d.popleft
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388 for i in xrange(BIG):
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diff changeset
389 append(i)
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390 for i in reversed(xrange(BIG)):
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diff changeset
391 x = pop()
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diff changeset
392 if x != i:
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diff changeset
393 self.assertEqual(x, i)
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diff changeset
394 self.assertEqual(len(d), 0)
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395
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diff changeset
396 def test_roundtrip_iter_init(self):
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diff changeset
397 d = deque(xrange(200))
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diff changeset
398 e = deque(d)
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diff changeset
399 self.assertNotEqual(id(d), id(e))
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diff changeset
400 self.assertEqual(list(d), list(e))
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diff changeset
401
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402 def test_pickle(self):
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403 d = deque(xrange(200))
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404 for i in range(pickle.HIGHEST_PROTOCOL + 1):
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405 s = pickle.dumps(d, i)
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406 e = pickle.loads(s)
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407 self.assertNotEqual(id(d), id(e))
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408 self.assertEqual(list(d), list(e))
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409
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410 ## def test_pickle_recursive(self):
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411 ## d = deque('abc')
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412 ## d.append(d)
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413 ## for i in range(pickle.HIGHEST_PROTOCOL + 1):
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414 ## e = pickle.loads(pickle.dumps(d, i))
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415 ## self.assertNotEqual(id(d), id(e))
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416 ## self.assertEqual(id(e), id(e[-1]))
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417
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418 def test_deepcopy(self):
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419 mut = [10]
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420 d = deque([mut])
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421 e = copy.deepcopy(d)
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422 self.assertEqual(list(d), list(e))
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423 mut[0] = 11
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424 self.assertNotEqual(id(d), id(e))
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425 self.assertNotEqual(list(d), list(e))
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426
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427 def test_copy(self):
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428 mut = [10]
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429 d = deque([mut])
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430 e = copy.copy(d)
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431 self.assertEqual(list(d), list(e))
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432 mut[0] = 11
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433 self.assertNotEqual(id(d), id(e))
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434 self.assertEqual(list(d), list(e))
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435
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436 def test_reversed(self):
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437 for s in ('abcd', xrange(2000)):
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438 self.assertEqual(list(reversed(deque(s))), list(reversed(s)))
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439
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440 def test_gc_doesnt_blowup(self):
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441 import gc
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442 # This used to assert-fail in deque_traverse() under a debug
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443 # build, or run wild with a NULL pointer in a release build.
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444 d = deque()
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445 for i in xrange(100):
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446 d.append(1)
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447 gc.collect()
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448
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449 def test_container_iterator(self):
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450 # Bug #3680: tp_traverse was not implemented for deque iterator objects
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451 class C(object):
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452 pass
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453 for i in range(2):
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454 obj = C()
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455 ref = weakref.ref(obj)
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456 if i == 0:
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457 container = deque([obj, 1])
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458 else:
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459 container = reversed(deque([obj, 1]))
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460 obj.x = iter(container)
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461 del obj, container
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462 gc.collect()
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463 self.assert_(ref() is None, "Cycle was not collected")
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464
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465 class TestVariousIteratorArgs(unittest.TestCase):
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466
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467 def test_constructor(self):
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468 for s in ("123", "", range(1000), ('do', 1.2), xrange(2000,2200,5)):
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469 for g in (seq_tests.Sequence, seq_tests.IterFunc,
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470 seq_tests.IterGen, seq_tests.IterFuncStop,
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471 seq_tests.itermulti, seq_tests.iterfunc):
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472 self.assertEqual(list(deque(g(s))), list(g(s)))
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473 self.assertRaises(TypeError, deque, seq_tests.IterNextOnly(s))
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474 self.assertRaises(TypeError, deque, seq_tests.IterNoNext(s))
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475 self.assertRaises(ZeroDivisionError, deque, seq_tests.IterGenExc(s))
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476
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477 def test_iter_with_altered_data(self):
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478 d = deque('abcdefg')
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479 it = iter(d)
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480 d.pop()
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481 self.assertRaises(RuntimeError, it.next)
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482
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483 def test_runtime_error_on_empty_deque(self):
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484 d = deque()
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485 it = iter(d)
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486 d.append(10)
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487 self.assertRaises(RuntimeError, it.next)
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488
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489 class Deque(deque):
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490 pass
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491
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492 class DequeWithBadIter(deque):
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493 def __iter__(self):
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494 raise TypeError
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495
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496 class TestSubclass(unittest.TestCase):
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497
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498 def test_basics(self):
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499 d = Deque(xrange(25))
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500 d.__init__(xrange(200))
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501 for i in xrange(200, 400):
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502 d.append(i)
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503 for i in reversed(xrange(-200, 0)):
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504 d.appendleft(i)
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505 self.assertEqual(list(d), range(-200, 400))
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506 self.assertEqual(len(d), 600)
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507
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508 left = [d.popleft() for i in xrange(250)]
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509 self.assertEqual(left, range(-200, 50))
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510 self.assertEqual(list(d), range(50, 400))
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511
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512 right = [d.pop() for i in xrange(250)]
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513 right.reverse()
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514 self.assertEqual(right, range(150, 400))
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515 self.assertEqual(list(d), range(50, 150))
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516
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517 d.clear()
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518 self.assertEqual(len(d), 0)
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519
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520 def test_copy_pickle(self):
63fa60f2d61c * Move collections.deque() in from the sandbox
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521
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522 d = Deque('abc')
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523
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524 e = d.__copy__()
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525 self.assertEqual(type(d), type(e))
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526 self.assertEqual(list(d), list(e))
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527
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528 e = Deque(d)
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529 self.assertEqual(type(d), type(e))
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530 self.assertEqual(list(d), list(e))
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diff changeset
531
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532 s = pickle.dumps(d)
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533 e = pickle.loads(s)
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534 self.assertNotEqual(id(d), id(e))
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535 self.assertEqual(type(d), type(e))
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536 self.assertEqual(list(d), list(e))
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537
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diff changeset
538 d = Deque('abcde', maxlen=4)
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diff changeset
539
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diff changeset
540 e = d.__copy__()
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
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parents: 43466
diff changeset
541 self.assertEqual(type(d), type(e))
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
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diff changeset
542 self.assertEqual(list(d), list(e))
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
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diff changeset
543
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diff changeset
544 e = Deque(d)
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diff changeset
545 self.assertEqual(type(d), type(e))
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
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diff changeset
546 self.assertEqual(list(d), list(e))
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547
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diff changeset
548 s = pickle.dumps(d)
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
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549 e = pickle.loads(s)
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diff changeset
550 self.assertNotEqual(id(d), id(e))
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diff changeset
551 self.assertEqual(type(d), type(e))
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diff changeset
552 self.assertEqual(list(d), list(e))
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
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diff changeset
553
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554 ## def test_pickle(self):
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555 ## d = Deque('abc')
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556 ## d.append(d)
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557 ##
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558 ## e = pickle.loads(pickle.dumps(d))
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559 ## self.assertNotEqual(id(d), id(e))
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diff changeset
560 ## self.assertEqual(type(d), type(e))
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diff changeset
561 ## dd = d.pop()
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diff changeset
562 ## ee = e.pop()
73f49656420b Add __asdict__() to NamedTuple and refine the docs.
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diff changeset
563 ## self.assertEqual(id(e), id(ee))
73f49656420b Add __asdict__() to NamedTuple and refine the docs.
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diff changeset
564 ## self.assertEqual(d, e)
73f49656420b Add __asdict__() to NamedTuple and refine the docs.
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diff changeset
565 ##
73f49656420b Add __asdict__() to NamedTuple and refine the docs.
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diff changeset
566 ## d.x = d
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diff changeset
567 ## e = pickle.loads(pickle.dumps(d))
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diff changeset
568 ## self.assertEqual(id(e), id(e.x))
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parents: 40682
diff changeset
569 ##
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diff changeset
570 ## d = DequeWithBadIter('abc')
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diff changeset
571 ## self.assertRaises(TypeError, pickle.dumps, d)
33949
b9819b9a0dad SF patch #1062279: deque pickling problems
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diff changeset
572
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573 def test_weakref(self):
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diff changeset
574 d = deque('gallahad')
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df3923c36ec5 Merged revisions 67952-67953,67955,67957-67958,67960-67961,67963,67965,67967,67970-67971,67973,67982,67988,67990,67995,68014,68016,68030,68057,68061,68112,68115-68118,68120-68121,68123-68128 via svnmerge from
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575 p = weakref.proxy(d)
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576 self.assertEqual(str(p), str(d))
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577 d = None
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578 self.assertRaises(ReferenceError, str, p)
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579
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580 def test_strange_subclass(self):
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diff changeset
581 class X(deque):
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diff changeset
582 def __iter__(self):
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parents: 33639
diff changeset
583 return iter([])
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diff changeset
584 d1 = X([1,2,3])
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585 d2 = X([4,5,6])
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586 d1 == d2 # not clear if this is supposed to be True or False,
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587 # but it used to give a SystemError
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diff changeset
588
40682
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589
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diff changeset
590 class SubclassWithKwargs(deque):
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591 def __init__(self, newarg=1):
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diff changeset
592 deque.__init__(self)
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diff changeset
593
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parents: 40573
diff changeset
594 class TestSubclassWithKwargs(unittest.TestCase):
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parents: 40573
diff changeset
595 def test_subclass_with_kwargs(self):
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Georg Brandl <georg@python.org>
parents: 40573
diff changeset
596 # SF bug #1486663 -- this used to erroneously raise a TypeError
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diff changeset
597 SubclassWithKwargs(newarg=1)
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diff changeset
598
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599 #==============================================================================
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600
31603
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diff changeset
601 libreftest = """
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diff changeset
602 Example from the Library Reference: Doc/lib/libcollections.tex
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
603
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
604 >>> from collections import deque
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parents: 31476
diff changeset
605 >>> d = deque('ghi') # make a new deque with three items
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parents: 31476
diff changeset
606 >>> for elem in d: # iterate over the deque's elements
31607
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parents: 31603
diff changeset
607 ... print elem.upper()
31603
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parents: 31476
diff changeset
608 G
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
609 H
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
610 I
15553a1b7a17 Improvements to collections.deque():
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diff changeset
611 >>> d.append('j') # add a new entry to the right side
15553a1b7a17 Improvements to collections.deque():
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diff changeset
612 >>> d.appendleft('f') # add a new entry to the left side
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
613 >>> d # show the representation of the deque
15553a1b7a17 Improvements to collections.deque():
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diff changeset
614 deque(['f', 'g', 'h', 'i', 'j'])
15553a1b7a17 Improvements to collections.deque():
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diff changeset
615 >>> d.pop() # return and remove the rightmost item
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diff changeset
616 'j'
15553a1b7a17 Improvements to collections.deque():
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diff changeset
617 >>> d.popleft() # return and remove the leftmost item
15553a1b7a17 Improvements to collections.deque():
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diff changeset
618 'f'
15553a1b7a17 Improvements to collections.deque():
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diff changeset
619 >>> list(d) # list the contents of the deque
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diff changeset
620 ['g', 'h', 'i']
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parents: 31603
diff changeset
621 >>> d[0] # peek at leftmost item
31603
15553a1b7a17 Improvements to collections.deque():
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diff changeset
622 'g'
31607
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parents: 31603
diff changeset
623 >>> d[-1] # peek at rightmost item
31603
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parents: 31476
diff changeset
624 'i'
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
625 >>> list(reversed(d)) # list the contents of a deque in reverse
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
626 ['i', 'h', 'g']
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
627 >>> 'h' in d # search the deque
15553a1b7a17 Improvements to collections.deque():
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diff changeset
628 True
15553a1b7a17 Improvements to collections.deque():
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diff changeset
629 >>> d.extend('jkl') # add multiple elements at once
15553a1b7a17 Improvements to collections.deque():
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diff changeset
630 >>> d
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
631 deque(['g', 'h', 'i', 'j', 'k', 'l'])
15553a1b7a17 Improvements to collections.deque():
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diff changeset
632 >>> d.rotate(1) # right rotation
15553a1b7a17 Improvements to collections.deque():
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diff changeset
633 >>> d
15553a1b7a17 Improvements to collections.deque():
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diff changeset
634 deque(['l', 'g', 'h', 'i', 'j', 'k'])
15553a1b7a17 Improvements to collections.deque():
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diff changeset
635 >>> d.rotate(-1) # left rotation
15553a1b7a17 Improvements to collections.deque():
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diff changeset
636 >>> d
15553a1b7a17 Improvements to collections.deque():
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diff changeset
637 deque(['g', 'h', 'i', 'j', 'k', 'l'])
15553a1b7a17 Improvements to collections.deque():
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diff changeset
638 >>> deque(reversed(d)) # make a new deque in reverse order
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
639 deque(['l', 'k', 'j', 'i', 'h', 'g'])
15553a1b7a17 Improvements to collections.deque():
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diff changeset
640 >>> d.clear() # empty the deque
15553a1b7a17 Improvements to collections.deque():
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diff changeset
641 >>> d.pop() # cannot pop from an empty deque
15553a1b7a17 Improvements to collections.deque():
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diff changeset
642 Traceback (most recent call last):
15553a1b7a17 Improvements to collections.deque():
Raymond Hettinger <python@rcn.com>
parents: 31476
diff changeset
643 File "<pyshell#6>", line 1, in -toplevel-
15553a1b7a17 Improvements to collections.deque():
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diff changeset
644 d.pop()
15553a1b7a17 Improvements to collections.deque():
Raymond Hettinger <python@rcn.com>
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diff changeset
645 IndexError: pop from an empty deque
15553a1b7a17 Improvements to collections.deque():
Raymond Hettinger <python@rcn.com>
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diff changeset
646
15553a1b7a17 Improvements to collections.deque():
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diff changeset
647 >>> d.extendleft('abc') # extendleft() reverses the input order
15553a1b7a17 Improvements to collections.deque():
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648 >>> d
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649 deque(['c', 'b', 'a'])
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650
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651
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652
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653 >>> def delete_nth(d, n):
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654 ... d.rotate(-n)
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655 ... d.popleft()
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656 ... d.rotate(n)
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657 ...
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658 >>> d = deque('abcdef')
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659 >>> delete_nth(d, 2) # remove the entry at d[2]
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660 >>> d
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661 deque(['a', 'b', 'd', 'e', 'f'])
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662
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663
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664
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665 >>> def roundrobin(*iterables):
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666 ... pending = deque(iter(i) for i in iterables)
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667 ... while pending:
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668 ... task = pending.popleft()
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669 ... try:
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670 ... yield task.next()
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671 ... except StopIteration:
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672 ... continue
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673 ... pending.append(task)
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674 ...
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675
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676 >>> for value in roundrobin('abc', 'd', 'efgh'):
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677 ... print value
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678 ...
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679 a
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680 d
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681 e
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682 b
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683 f
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684 c
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685 g
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686 h
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687
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688
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689 >>> def maketree(iterable):
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690 ... d = deque(iterable)
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691 ... while len(d) > 1:
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692 ... pair = [d.popleft(), d.popleft()]
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693 ... d.append(pair)
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694 ... return list(d)
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695 ...
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696 >>> print maketree('abcdefgh')
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697 [[[['a', 'b'], ['c', 'd']], [['e', 'f'], ['g', 'h']]]]
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698
31603
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parents: 31476
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699 """
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700
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701
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702 #==============================================================================
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703
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704 __test__ = {'libreftest' : libreftest}
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parents: 31476
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705
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706 def test_main(verbose=None):
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707 import sys
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708 test_classes = (
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parents:
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709 TestBasic,
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710 TestVariousIteratorArgs,
63fa60f2d61c * Move collections.deque() in from the sandbox
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711 TestSubclass,
40682
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712 TestSubclassWithKwargs,
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713 )
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714
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715 test_support.run_unittest(*test_classes)
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716
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717 # verify reference counting
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718 if verbose and hasattr(sys, "gettotalrefcount"):
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719 import gc
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720 counts = [None] * 5
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721 for i in xrange(len(counts)):
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722 test_support.run_unittest(*test_classes)
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723 gc.collect()
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724 counts[i] = sys.gettotalrefcount()
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725 print counts
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parents: 31603
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726
31603
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Raymond Hettinger <python@rcn.com>
parents: 31476
diff changeset
727 # doctests
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Raymond Hettinger <python@rcn.com>
parents: 31476
diff changeset
728 from test import test_deque
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parents: 32084
diff changeset
729 test_support.run_doctest(test_deque, verbose)
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parents:
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730
63fa60f2d61c * Move collections.deque() in from the sandbox
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parents:
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731 if __name__ == "__main__":
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732 test_main(verbose=True)