annotate Lib/test/test_deque.py @ 58925:eecf1bef052d 2.6

Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents b5a4acbeaaa1
children b36cb4602e21
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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 d = deque(range(10), maxlen=3)
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54 self.assertEqual(repr(d), 'deque([7, 8, 9], maxlen=3)')
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55 self.assertEqual(list(d), range(7, 10))
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56 self.assertEqual(d, deque(range(10), 3))
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57 d.append(10)
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58 self.assertEqual(list(d), range(8, 11))
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59 d.appendleft(7)
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60 self.assertEqual(list(d), range(7, 10))
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61 d.extend([10, 11])
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62 self.assertEqual(list(d), range(9, 12))
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63 d.extendleft([8, 7])
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64 self.assertEqual(list(d), range(7, 10))
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65 d = deque(xrange(200), maxlen=10)
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66 d.append(d)
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67 test_support.unlink(test_support.TESTFN)
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68 fo = open(test_support.TESTFN, "wb")
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69 try:
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70 print >> fo, d,
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71 fo.close()
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72 fo = open(test_support.TESTFN, "rb")
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73 self.assertEqual(fo.read(), repr(d))
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74 finally:
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75 fo.close()
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76 test_support.unlink(test_support.TESTFN)
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77
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78 d = deque(range(10), maxlen=None)
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79 self.assertEqual(repr(d), 'deque([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])')
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80 fo = open(test_support.TESTFN, "wb")
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81 try:
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82 print >> fo, d,
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83 fo.close()
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84 fo = open(test_support.TESTFN, "rb")
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85 self.assertEqual(fo.read(), repr(d))
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86 finally:
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87 fo.close()
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88 test_support.unlink(test_support.TESTFN)
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89
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90 def test_comparisons(self):
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91 d = deque('xabc'); d.popleft()
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92 for e in [d, deque('abc'), deque('ab'), deque(), list(d)]:
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93 self.assertEqual(d==e, type(d)==type(e) and list(d)==list(e))
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94 self.assertEqual(d!=e, not(type(d)==type(e) and list(d)==list(e)))
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95
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96 args = map(deque, ('', 'a', 'b', 'ab', 'ba', 'abc', 'xba', 'xabc', 'cba'))
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97 for x in args:
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98 for y in args:
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99 self.assertEqual(x == y, list(x) == list(y), (x,y))
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100 self.assertEqual(x != y, list(x) != list(y), (x,y))
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101 self.assertEqual(x < y, list(x) < list(y), (x,y))
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102 self.assertEqual(x <= y, list(x) <= list(y), (x,y))
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103 self.assertEqual(x > y, list(x) > list(y), (x,y))
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104 self.assertEqual(x >= y, list(x) >= list(y), (x,y))
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105 self.assertEqual(cmp(x,y), cmp(list(x),list(y)), (x,y))
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106
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107 def test_extend(self):
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108 d = deque('a')
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109 self.assertRaises(TypeError, d.extend, 1)
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110 d.extend('bcd')
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111 self.assertEqual(list(d), list('abcd'))
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112 d.extend(d)
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113 self.assertEqual(list(d), list('abcdabcd'))
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114
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115 def test_iadd(self):
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116 d = deque('a')
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117 d += 'bcd'
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118 self.assertEqual(list(d), list('abcd'))
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119 d += d
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120 self.assertEqual(list(d), list('abcdabcd'))
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121
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122 def test_extendleft(self):
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123 d = deque('a')
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124 self.assertRaises(TypeError, d.extendleft, 1)
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125 d.extendleft('bcd')
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126 self.assertEqual(list(d), list(reversed('abcd')))
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127 d.extendleft(d)
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128 self.assertEqual(list(d), list('abcddcba'))
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129 d = deque()
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130 d.extendleft(range(1000))
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131 self.assertEqual(list(d), list(reversed(range(1000))))
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132 self.assertRaises(SyntaxError, d.extendleft, fail())
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133
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134 def test_getitem(self):
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135 n = 200
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136 d = deque(xrange(n))
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137 l = range(n)
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138 for i in xrange(n):
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139 d.popleft()
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140 l.pop(0)
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141 if random.random() < 0.5:
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142 d.append(i)
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143 l.append(i)
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144 for j in xrange(1-len(l), len(l)):
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145 assert d[j] == l[j]
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146
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147 d = deque('superman')
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148 self.assertEqual(d[0], 's')
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149 self.assertEqual(d[-1], 'n')
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150 d = deque()
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151 self.assertRaises(IndexError, d.__getitem__, 0)
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152 self.assertRaises(IndexError, d.__getitem__, -1)
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153
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154 def test_setitem(self):
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155 n = 200
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156 d = deque(xrange(n))
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157 for i in xrange(n):
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158 d[i] = 10 * i
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159 self.assertEqual(list(d), [10*i for i in xrange(n)])
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160 l = list(d)
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161 for i in xrange(1-n, 0, -1):
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162 d[i] = 7*i
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163 l[i] = 7*i
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164 self.assertEqual(list(d), l)
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165
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166 def test_delitem(self):
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167 n = 500 # O(n**2) test, don't make this too big
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168 d = deque(xrange(n))
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169 self.assertRaises(IndexError, d.__delitem__, -n-1)
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170 self.assertRaises(IndexError, d.__delitem__, n)
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171 for i in xrange(n):
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172 self.assertEqual(len(d), n-i)
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173 j = random.randrange(-len(d), len(d))
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174 val = d[j]
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175 self.assert_(val in d)
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176 del d[j]
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177 self.assert_(val not in d)
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178 self.assertEqual(len(d), 0)
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179
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180 def test_rotate(self):
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181 s = tuple('abcde')
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182 n = len(s)
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183
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184 d = deque(s)
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185 d.rotate(1) # verify rot(1)
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186 self.assertEqual(''.join(d), 'eabcd')
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187
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188 d = deque(s)
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189 d.rotate(-1) # verify rot(-1)
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190 self.assertEqual(''.join(d), 'bcdea')
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191 d.rotate() # check default to 1
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192 self.assertEqual(tuple(d), s)
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193
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194 for i in xrange(n*3):
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195 d = deque(s)
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196 e = deque(d)
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197 d.rotate(i) # check vs. rot(1) n times
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198 for j in xrange(i):
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199 e.rotate(1)
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200 self.assertEqual(tuple(d), tuple(e))
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201 d.rotate(-i) # check that it works in reverse
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202 self.assertEqual(tuple(d), s)
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203 e.rotate(n-i) # check that it wraps forward
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204 self.assertEqual(tuple(e), s)
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205
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206 for i in xrange(n*3):
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207 d = deque(s)
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208 e = deque(d)
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209 d.rotate(-i)
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210 for j in xrange(i):
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211 e.rotate(-1) # check vs. rot(-1) n times
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212 self.assertEqual(tuple(d), tuple(e))
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213 d.rotate(i) # check that it works in reverse
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214 self.assertEqual(tuple(d), s)
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215 e.rotate(i-n) # check that it wraps backaround
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216 self.assertEqual(tuple(e), s)
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217
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218 d = deque(s)
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219 e = deque(s)
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220 e.rotate(BIG+17) # verify on long series of rotates
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221 dr = d.rotate
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222 for i in xrange(BIG+17):
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223 dr()
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224 self.assertEqual(tuple(d), tuple(e))
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225
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226 self.assertRaises(TypeError, d.rotate, 'x') # Wrong arg type
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227 self.assertRaises(TypeError, d.rotate, 1, 10) # Too many args
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228
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229 d = deque()
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230 d.rotate() # rotate an empty deque
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231 self.assertEqual(d, deque())
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232
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233 def test_len(self):
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234 d = deque('ab')
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235 self.assertEqual(len(d), 2)
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236 d.popleft()
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237 self.assertEqual(len(d), 1)
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238 d.pop()
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239 self.assertEqual(len(d), 0)
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240 self.assertRaises(IndexError, d.pop)
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241 self.assertEqual(len(d), 0)
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242 d.append('c')
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243 self.assertEqual(len(d), 1)
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244 d.appendleft('d')
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245 self.assertEqual(len(d), 2)
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246 d.clear()
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247 self.assertEqual(len(d), 0)
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248
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249 def test_underflow(self):
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250 d = deque()
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251 self.assertRaises(IndexError, d.pop)
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252 self.assertRaises(IndexError, d.popleft)
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253
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254 def test_clear(self):
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255 d = deque(xrange(100))
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256 self.assertEqual(len(d), 100)
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257 d.clear()
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258 self.assertEqual(len(d), 0)
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259 self.assertEqual(list(d), [])
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260 d.clear() # clear an emtpy deque
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261 self.assertEqual(list(d), [])
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262
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263 def test_remove(self):
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264 d = deque('abcdefghcij')
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265 d.remove('c')
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266 self.assertEqual(d, deque('abdefghcij'))
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267 d.remove('c')
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268 self.assertEqual(d, deque('abdefghij'))
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269 self.assertRaises(ValueError, d.remove, 'c')
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270 self.assertEqual(d, deque('abdefghij'))
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271
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272 # Handle comparison errors
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273 d = deque(['a', 'b', BadCmp(), 'c'])
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274 e = deque(d)
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275 self.assertRaises(RuntimeError, d.remove, 'c')
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276 for x, y in zip(d, e):
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277 # verify that original order and values are retained.
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278 self.assert_(x is y)
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279
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280 # Handle evil mutator
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281 for match in (True, False):
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282 d = deque(['ab'])
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283 d.extend([MutateCmp(d, match), 'c'])
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284 self.assertRaises(IndexError, d.remove, 'c')
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285 self.assertEqual(d, deque())
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286
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287 def test_repr(self):
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288 d = deque(xrange(200))
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289 e = eval(repr(d))
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290 self.assertEqual(list(d), list(e))
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291 d.append(d)
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292 self.assert_('...' in repr(d))
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293
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294 def test_print(self):
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295 d = deque(xrange(200))
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296 d.append(d)
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297 test_support.unlink(test_support.TESTFN)
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298 fo = open(test_support.TESTFN, "wb")
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299 try:
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300 print >> fo, d,
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301 fo.close()
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302 fo = open(test_support.TESTFN, "rb")
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303 self.assertEqual(fo.read(), repr(d))
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304 finally:
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305 fo.close()
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306 test_support.unlink(test_support.TESTFN)
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307
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308 def test_init(self):
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309 self.assertRaises(TypeError, deque, 'abc', 2, 3);
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310 self.assertRaises(TypeError, deque, 1);
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311
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312 def test_hash(self):
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313 self.assertRaises(TypeError, hash, deque('abc'))
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314
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315 def test_long_steadystate_queue_popleft(self):
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316 for size in (0, 1, 2, 100, 1000):
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317 d = deque(xrange(size))
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318 append, pop = d.append, d.popleft
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319 for i in xrange(size, BIG):
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320 append(i)
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321 x = pop()
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322 if x != i - size:
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323 self.assertEqual(x, i-size)
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324 self.assertEqual(list(d), range(BIG-size, BIG))
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325
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326 def test_long_steadystate_queue_popright(self):
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327 for size in (0, 1, 2, 100, 1000):
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328 d = deque(reversed(xrange(size)))
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329 append, pop = d.appendleft, d.pop
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330 for i in xrange(size, BIG):
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331 append(i)
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332 x = pop()
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333 if x != i - size:
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334 self.assertEqual(x, i-size)
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335 self.assertEqual(list(reversed(list(d))), range(BIG-size, BIG))
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336
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337 def test_big_queue_popleft(self):
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338 pass
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339 d = deque()
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340 append, pop = d.append, d.popleft
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341 for i in xrange(BIG):
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342 append(i)
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343 for i in xrange(BIG):
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344 x = pop()
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345 if x != i:
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346 self.assertEqual(x, i)
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347
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348 def test_big_queue_popright(self):
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349 d = deque()
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350 append, pop = d.appendleft, d.pop
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351 for i in xrange(BIG):
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352 append(i)
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353 for i in xrange(BIG):
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354 x = pop()
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355 if x != i:
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356 self.assertEqual(x, i)
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357
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358 def test_big_stack_right(self):
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359 d = deque()
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360 append, pop = d.append, d.pop
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361 for i in xrange(BIG):
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362 append(i)
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363 for i in reversed(xrange(BIG)):
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364 x = pop()
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365 if x != i:
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366 self.assertEqual(x, i)
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367 self.assertEqual(len(d), 0)
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368
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369 def test_big_stack_left(self):
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370 d = deque()
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371 append, pop = d.appendleft, d.popleft
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372 for i in xrange(BIG):
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373 append(i)
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374 for i in reversed(xrange(BIG)):
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375 x = pop()
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376 if x != i:
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377 self.assertEqual(x, i)
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378 self.assertEqual(len(d), 0)
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379
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380 def test_roundtrip_iter_init(self):
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381 d = deque(xrange(200))
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382 e = deque(d)
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383 self.assertNotEqual(id(d), id(e))
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384 self.assertEqual(list(d), list(e))
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385
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386 def test_pickle(self):
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387 d = deque(xrange(200))
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388 for i in range(pickle.HIGHEST_PROTOCOL + 1):
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389 s = pickle.dumps(d, i)
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390 e = pickle.loads(s)
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391 self.assertNotEqual(id(d), id(e))
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392 self.assertEqual(list(d), list(e))
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393
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394 ## def test_pickle_recursive(self):
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395 ## d = deque('abc')
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396 ## d.append(d)
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397 ## for i in range(pickle.HIGHEST_PROTOCOL + 1):
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398 ## e = pickle.loads(pickle.dumps(d, i))
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399 ## self.assertNotEqual(id(d), id(e))
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400 ## self.assertEqual(id(e), id(e[-1]))
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401
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402 def test_deepcopy(self):
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403 mut = [10]
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404 d = deque([mut])
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405 e = copy.deepcopy(d)
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406 self.assertEqual(list(d), list(e))
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407 mut[0] = 11
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408 self.assertNotEqual(id(d), id(e))
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409 self.assertNotEqual(list(d), list(e))
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410
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411 def test_copy(self):
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412 mut = [10]
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413 d = deque([mut])
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414 e = copy.copy(d)
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415 self.assertEqual(list(d), list(e))
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416 mut[0] = 11
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417 self.assertNotEqual(id(d), id(e))
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418 self.assertEqual(list(d), list(e))
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419
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420 def test_reversed(self):
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421 for s in ('abcd', xrange(2000)):
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422 self.assertEqual(list(reversed(deque(s))), list(reversed(s)))
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423
33639
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424 def test_gc_doesnt_blowup(self):
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425 import gc
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426 # This used to assert-fail in deque_traverse() under a debug
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427 # build, or run wild with a NULL pointer in a release build.
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428 d = deque()
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429 for i in xrange(100):
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430 d.append(1)
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431 gc.collect()
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432
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433 def test_container_iterator(self):
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434 # Bug #3680: tp_traverse was not implemented for deque iterator objects
50424
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435 class C(object):
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436 pass
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437 for i in range(2):
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438 obj = C()
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439 ref = weakref.ref(obj)
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440 if i == 0:
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441 container = deque([obj, 1])
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442 else:
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443 container = reversed(deque([obj, 1]))
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444 obj.x = iter(container)
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445 del obj, container
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446 gc.collect()
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447 self.assert_(ref() is None, "Cycle was not collected")
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448
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449 class TestVariousIteratorArgs(unittest.TestCase):
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450
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451 def test_constructor(self):
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452 for s in ("123", "", range(1000), ('do', 1.2), xrange(2000,2200,5)):
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diff changeset
453 for g in (seq_tests.Sequence, seq_tests.IterFunc,
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diff changeset
454 seq_tests.IterGen, seq_tests.IterFuncStop,
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455 seq_tests.itermulti, seq_tests.iterfunc):
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456 self.assertEqual(list(deque(g(s))), list(g(s)))
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457 self.assertRaises(TypeError, deque, seq_tests.IterNextOnly(s))
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458 self.assertRaises(TypeError, deque, seq_tests.IterNoNext(s))
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459 self.assertRaises(ZeroDivisionError, deque, seq_tests.IterGenExc(s))
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460
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461 def test_iter_with_altered_data(self):
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462 d = deque('abcdefg')
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463 it = iter(d)
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464 d.pop()
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465 self.assertRaises(RuntimeError, it.next)
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466
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diff changeset
467 def test_runtime_error_on_empty_deque(self):
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diff changeset
468 d = deque()
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diff changeset
469 it = iter(d)
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470 d.append(10)
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471 self.assertRaises(RuntimeError, it.next)
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472
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473 class Deque(deque):
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474 pass
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475
33949
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diff changeset
476 class DequeWithBadIter(deque):
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477 def __iter__(self):
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478 raise TypeError
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479
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480 class TestSubclass(unittest.TestCase):
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481
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482 def test_basics(self):
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483 d = Deque(xrange(25))
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484 d.__init__(xrange(200))
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485 for i in xrange(200, 400):
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486 d.append(i)
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487 for i in reversed(xrange(-200, 0)):
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488 d.appendleft(i)
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489 self.assertEqual(list(d), range(-200, 400))
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490 self.assertEqual(len(d), 600)
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491
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492 left = [d.popleft() for i in xrange(250)]
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493 self.assertEqual(left, range(-200, 50))
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494 self.assertEqual(list(d), range(50, 400))
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495
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496 right = [d.pop() for i in xrange(250)]
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497 right.reverse()
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498 self.assertEqual(right, range(150, 400))
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499 self.assertEqual(list(d), range(50, 150))
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500
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501 d.clear()
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502 self.assertEqual(len(d), 0)
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503
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504 def test_copy_pickle(self):
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505
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506 d = Deque('abc')
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507
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508 e = d.__copy__()
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509 self.assertEqual(type(d), type(e))
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510 self.assertEqual(list(d), list(e))
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511
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512 e = Deque(d)
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513 self.assertEqual(type(d), type(e))
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diff changeset
514 self.assertEqual(list(d), list(e))
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515
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516 s = pickle.dumps(d)
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517 e = pickle.loads(s)
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518 self.assertNotEqual(id(d), id(e))
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519 self.assertEqual(type(d), type(e))
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520 self.assertEqual(list(d), list(e))
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521
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diff changeset
522 d = Deque('abcde', maxlen=4)
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diff changeset
523
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
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diff changeset
524 e = d.__copy__()
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
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diff changeset
525 self.assertEqual(type(d), type(e))
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diff changeset
526 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
527
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
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diff changeset
528 e = Deque(d)
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diff changeset
529 self.assertEqual(type(d), type(e))
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diff changeset
530 self.assertEqual(list(d), list(e))
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
Raymond Hettinger <python@rcn.com>
parents: 43466
diff changeset
531
da52b4c776a4 Accept Jim Jewett's api suggestion to use None instead of -1 to indicate unbounded deques.
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diff changeset
532 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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533 e = pickle.loads(s)
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diff changeset
534 self.assertNotEqual(id(d), id(e))
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diff changeset
535 self.assertEqual(type(d), type(e))
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diff changeset
536 self.assertEqual(list(d), list(e))
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537
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73f49656420b Add __asdict__() to NamedTuple and refine the docs.
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diff changeset
538 ## def test_pickle(self):
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parents: 40682
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539 ## d = Deque('abc')
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540 ## d.append(d)
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541 ##
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542 ## e = pickle.loads(pickle.dumps(d))
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543 ## self.assertNotEqual(id(d), id(e))
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544 ## self.assertEqual(type(d), type(e))
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diff changeset
545 ## dd = d.pop()
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546 ## ee = e.pop()
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diff changeset
547 ## self.assertEqual(id(e), id(ee))
73f49656420b Add __asdict__() to NamedTuple and refine the docs.
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diff changeset
548 ## self.assertEqual(d, e)
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diff changeset
549 ##
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550 ## d.x = d
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551 ## e = pickle.loads(pickle.dumps(d))
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552 ## self.assertEqual(id(e), id(e.x))
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553 ##
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554 ## d = DequeWithBadIter('abc')
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555 ## self.assertRaises(TypeError, pickle.dumps, d)
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556
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557 def test_weakref(self):
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558 d = deque('gallahad')
50424
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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559 p = weakref.proxy(d)
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560 self.assertEqual(str(p), str(d))
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561 d = None
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562 self.assertRaises(ReferenceError, str, p)
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563
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564 def test_strange_subclass(self):
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565 class X(deque):
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566 def __iter__(self):
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567 return iter([])
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568 d1 = X([1,2,3])
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parents: 33639
diff changeset
569 d2 = X([4,5,6])
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570 d1 == d2 # not clear if this is supposed to be True or False,
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571 # but it used to give a SystemError
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572
40682
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573
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574 class SubclassWithKwargs(deque):
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575 def __init__(self, newarg=1):
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576 deque.__init__(self)
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577
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parents: 40573
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578 class TestSubclassWithKwargs(unittest.TestCase):
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parents: 40573
diff changeset
579 def test_subclass_with_kwargs(self):
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parents: 40573
diff changeset
580 # SF bug #1486663 -- this used to erroneously raise a TypeError
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parents: 40573
diff changeset
581 SubclassWithKwargs(newarg=1)
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diff changeset
582
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583 #==============================================================================
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584
31603
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585 libreftest = """
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diff changeset
586 Example from the Library Reference: Doc/lib/libcollections.tex
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587
15553a1b7a17 Improvements to collections.deque():
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diff changeset
588 >>> from collections import deque
15553a1b7a17 Improvements to collections.deque():
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589 >>> d = deque('ghi') # make a new deque with three items
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590 >>> for elem in d: # iterate over the deque's elements
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591 ... print elem.upper()
31603
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diff changeset
592 G
15553a1b7a17 Improvements to collections.deque():
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diff changeset
593 H
15553a1b7a17 Improvements to collections.deque():
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diff changeset
594 I
15553a1b7a17 Improvements to collections.deque():
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diff changeset
595 >>> d.append('j') # add a new entry to the right side
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diff changeset
596 >>> d.appendleft('f') # add a new entry to the left side
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diff changeset
597 >>> d # show the representation of the deque
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diff changeset
598 deque(['f', 'g', 'h', 'i', 'j'])
15553a1b7a17 Improvements to collections.deque():
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diff changeset
599 >>> d.pop() # return and remove the rightmost item
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diff changeset
600 'j'
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diff changeset
601 >>> d.popleft() # return and remove the leftmost item
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
602 'f'
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
603 >>> list(d) # list the contents of the deque
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
604 ['g', 'h', 'i']
31607
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parents: 31603
diff changeset
605 >>> d[0] # peek at leftmost item
31603
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diff changeset
606 'g'
31607
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diff changeset
607 >>> d[-1] # peek at rightmost item
31603
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diff changeset
608 'i'
15553a1b7a17 Improvements to collections.deque():
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diff changeset
609 >>> list(reversed(d)) # list the contents of a deque in reverse
15553a1b7a17 Improvements to collections.deque():
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diff changeset
610 ['i', 'h', 'g']
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
611 >>> 'h' in d # search the deque
15553a1b7a17 Improvements to collections.deque():
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diff changeset
612 True
15553a1b7a17 Improvements to collections.deque():
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diff changeset
613 >>> d.extend('jkl') # add multiple elements at once
15553a1b7a17 Improvements to collections.deque():
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diff changeset
614 >>> d
15553a1b7a17 Improvements to collections.deque():
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diff changeset
615 deque(['g', 'h', 'i', 'j', 'k', 'l'])
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diff changeset
616 >>> d.rotate(1) # right rotation
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diff changeset
617 >>> d
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618 deque(['l', 'g', 'h', 'i', 'j', 'k'])
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diff changeset
619 >>> d.rotate(-1) # left rotation
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diff changeset
620 >>> d
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diff changeset
621 deque(['g', 'h', 'i', 'j', 'k', 'l'])
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diff changeset
622 >>> deque(reversed(d)) # make a new deque in reverse order
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parents: 31476
diff changeset
623 deque(['l', 'k', 'j', 'i', 'h', 'g'])
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diff changeset
624 >>> d.clear() # empty the deque
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625 >>> d.pop() # cannot pop from an empty deque
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parents: 31476
diff changeset
626 Traceback (most recent call last):
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diff changeset
627 File "<pyshell#6>", line 1, in -toplevel-
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diff changeset
628 d.pop()
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diff changeset
629 IndexError: pop from an empty deque
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diff changeset
630
15553a1b7a17 Improvements to collections.deque():
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parents: 31476
diff changeset
631 >>> d.extendleft('abc') # extendleft() reverses the input order
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diff changeset
632 >>> d
15553a1b7a17 Improvements to collections.deque():
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diff changeset
633 deque(['c', 'b', 'a'])
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diff changeset
634
32014
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635
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636
582dca02e60f Add more examples.
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diff changeset
637 >>> def delete_nth(d, n):
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638 ... d.rotate(-n)
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diff changeset
639 ... d.popleft()
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diff changeset
640 ... d.rotate(n)
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parents: 31607
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641 ...
582dca02e60f Add more examples.
Raymond Hettinger <python@rcn.com>
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diff changeset
642 >>> d = deque('abcdef')
582dca02e60f Add more examples.
Raymond Hettinger <python@rcn.com>
parents: 31607
diff changeset
643 >>> delete_nth(d, 2) # remove the entry at d[2]
582dca02e60f Add more examples.
Raymond Hettinger <python@rcn.com>
parents: 31607
diff changeset
644 >>> d
582dca02e60f Add more examples.
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645 deque(['a', 'b', 'd', 'e', 'f'])
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diff changeset
646
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647
582dca02e60f Add more examples.
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parents: 31607
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648
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649 >>> def roundrobin(*iterables):
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650 ... pending = deque(iter(i) for i in iterables)
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651 ... while pending:
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652 ... task = pending.popleft()
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653 ... try:
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654 ... yield task.next()
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655 ... except StopIteration:
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656 ... continue
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657 ... pending.append(task)
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658 ...
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659
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660 >>> for value in roundrobin('abc', 'd', 'efgh'):
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661 ... print value
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662 ...
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663 a
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664 d
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665 e
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parents: 31607
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666 b
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parents: 31607
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667 f
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parents: 31607
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668 c
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parents: 31607
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669 g
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parents: 31607
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670 h
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671
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672
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673 >>> def maketree(iterable):
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Raymond Hettinger <python@rcn.com>
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674 ... d = deque(iterable)
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675 ... while len(d) > 1:
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676 ... pair = [d.popleft(), d.popleft()]
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677 ... d.append(pair)
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678 ... return list(d)
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679 ...
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680 >>> print maketree('abcdefgh')
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681 [[[['a', 'b'], ['c', 'd']], [['e', 'f'], ['g', 'h']]]]
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parents: 31607
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682
31603
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683 """
15553a1b7a17 Improvements to collections.deque():
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684
15553a1b7a17 Improvements to collections.deque():
Raymond Hettinger <python@rcn.com>
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685
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686 #==============================================================================
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Raymond Hettinger <python@rcn.com>
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687
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688 __test__ = {'libreftest' : libreftest}
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689
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690 def test_main(verbose=None):
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691 import sys
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692 test_classes = (
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693 TestBasic,
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694 TestVariousIteratorArgs,
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695 TestSubclass,
40682
77e0f4718a7c Bug #1486663: don't reject keyword arguments for subclasses of builtin
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696 TestSubclassWithKwargs,
31436
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697 )
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698
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699 test_support.run_unittest(*test_classes)
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700
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701 # verify reference counting
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702 if verbose and hasattr(sys, "gettotalrefcount"):
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703 import gc
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704 counts = [None] * 5
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705 for i in xrange(len(counts)):
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parents:
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706 test_support.run_unittest(*test_classes)
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707 gc.collect()
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708 counts[i] = sys.gettotalrefcount()
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709 print counts
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8ecee8f47108 Replace left(), right(), and __reversed__() with the more general purpose
Raymond Hettinger <python@rcn.com>
parents: 31603
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710
31603
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Raymond Hettinger <python@rcn.com>
parents: 31476
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711 # doctests
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Raymond Hettinger <python@rcn.com>
parents: 31476
diff changeset
712 from test import test_deque
32121
302d399cfd37 SF patch #872326: Generator expression implementation
Raymond Hettinger <python@rcn.com>
parents: 32084
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713 test_support.run_doctest(test_deque, verbose)
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714
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715 if __name__ == "__main__":
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716 test_main(verbose=True)