| 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 | from weakref import proxy
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| 5 | import copy
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| 6 | import cPickle as pickle
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| 7 | from cStringIO import StringIO
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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(100))
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| 33 | d.__init__(xrange(100, 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_comparisons(self):
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| 51 | d = deque('xabc'); d.popleft()
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| 52 | for e in [d, deque('abc'), deque('ab'), deque(), list(d)]:
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| 53 | self.assertEqual(d==e, type(d)==type(e) and list(d)==list(e))
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| 54 | self.assertEqual(d!=e, not(type(d)==type(e) and list(d)==list(e)))
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| 55 |
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| 56 | args = map(deque, ('', 'a', 'b', 'ab', 'ba', 'abc', 'xba', 'xabc', 'cba'))
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| 57 | for x in args:
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| 58 | for y in args:
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| 59 | self.assertEqual(x == y, list(x) == list(y), (x,y))
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| 60 | self.assertEqual(x != y, list(x) != list(y), (x,y))
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| 61 | self.assertEqual(x < y, list(x) < list(y), (x,y))
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| 62 | self.assertEqual(x <= y, list(x) <= list(y), (x,y))
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| 63 | self.assertEqual(x > y, list(x) > list(y), (x,y))
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| 64 | self.assertEqual(x >= y, list(x) >= list(y), (x,y))
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| 65 | self.assertEqual(cmp(x,y), cmp(list(x),list(y)), (x,y))
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| 66 |
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| 67 | def test_extend(self):
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| 68 | d = deque('a')
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| 69 | self.assertRaises(TypeError, d.extend, 1)
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| 70 | d.extend('bcd')
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| 71 | self.assertEqual(list(d), list('abcd'))
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| 72 |
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| 73 | def test_extendleft(self):
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| 74 | d = deque('a')
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| 75 | self.assertRaises(TypeError, d.extendleft, 1)
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| 76 | d.extendleft('bcd')
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| 77 | self.assertEqual(list(d), list(reversed('abcd')))
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| 78 | d = deque()
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| 79 | d.extendleft(range(1000))
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| 80 | self.assertEqual(list(d), list(reversed(range(1000))))
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| 81 | self.assertRaises(SyntaxError, d.extendleft, fail())
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| 82 |
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| 83 | def test_getitem(self):
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| 84 | n = 200
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| 85 | d = deque(xrange(n))
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| 86 | l = range(n)
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| 87 | for i in xrange(n):
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| 88 | d.popleft()
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| 89 | l.pop(0)
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| 90 | if random.random() < 0.5:
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| 91 | d.append(i)
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| 92 | l.append(i)
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| 93 | for j in xrange(1-len(l), len(l)):
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| 94 | assert d[j] == l[j]
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| 95 |
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| 96 | d = deque('superman')
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| 97 | self.assertEqual(d[0], 's')
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| 98 | self.assertEqual(d[-1], 'n')
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| 99 | d = deque()
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| 100 | self.assertRaises(IndexError, d.__getitem__, 0)
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| 101 | self.assertRaises(IndexError, d.__getitem__, -1)
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| 102 |
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| 103 | def test_setitem(self):
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| 104 | n = 200
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| 105 | d = deque(xrange(n))
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| 106 | for i in xrange(n):
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| 107 | d[i] = 10 * i
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| 108 | self.assertEqual(list(d), [10*i for i in xrange(n)])
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| 109 | l = list(d)
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| 110 | for i in xrange(1-n, 0, -1):
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| 111 | d[i] = 7*i
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| 112 | l[i] = 7*i
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| 113 | self.assertEqual(list(d), l)
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| 114 |
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| 115 | def test_delitem(self):
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| 116 | n = 500 # O(n**2) test, don't make this too big
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| 117 | d = deque(xrange(n))
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| 118 | self.assertRaises(IndexError, d.__delitem__, -n-1)
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| 119 | self.assertRaises(IndexError, d.__delitem__, n)
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| 120 | for i in xrange(n):
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| 121 | self.assertEqual(len(d), n-i)
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| 122 | j = random.randrange(-len(d), len(d))
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| 123 | val = d[j]
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| 124 | self.assert_(val in d)
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| 125 | del d[j]
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| 126 | self.assert_(val not in d)
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| 127 | self.assertEqual(len(d), 0)
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| 128 |
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| 129 | def test_rotate(self):
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| 130 | s = tuple('abcde')
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| 131 | n = len(s)
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| 132 |
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| 133 | d = deque(s)
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| 134 | d.rotate(1) # verify rot(1)
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| 135 | self.assertEqual(''.join(d), 'eabcd')
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| 136 |
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| 137 | d = deque(s)
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| 138 | d.rotate(-1) # verify rot(-1)
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| 139 | self.assertEqual(''.join(d), 'bcdea')
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| 140 | d.rotate() # check default to 1
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| 141 | self.assertEqual(tuple(d), s)
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| 142 |
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| 143 | for i in xrange(n*3):
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| 144 | d = deque(s)
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| 145 | e = deque(d)
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| 146 | d.rotate(i) # check vs. rot(1) n times
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| 147 | for j in xrange(i):
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| 148 | e.rotate(1)
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| 149 | self.assertEqual(tuple(d), tuple(e))
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| 150 | d.rotate(-i) # check that it works in reverse
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| 151 | self.assertEqual(tuple(d), s)
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| 152 | e.rotate(n-i) # check that it wraps forward
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| 153 | self.assertEqual(tuple(e), s)
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| 154 |
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| 155 | for i in xrange(n*3):
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| 156 | d = deque(s)
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| 157 | e = deque(d)
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| 158 | d.rotate(-i)
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| 159 | for j in xrange(i):
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| 160 | e.rotate(-1) # check vs. rot(-1) n times
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| 161 | self.assertEqual(tuple(d), tuple(e))
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| 162 | d.rotate(i) # check that it works in reverse
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| 163 | self.assertEqual(tuple(d), s)
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| 164 | e.rotate(i-n) # check that it wraps backaround
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| 165 | self.assertEqual(tuple(e), s)
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| 166 |
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| 167 | d = deque(s)
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| 168 | e = deque(s)
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| 169 | e.rotate(BIG+17) # verify on long series of rotates
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| 170 | dr = d.rotate
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| 171 | for i in xrange(BIG+17):
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| 172 | dr()
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| 173 | self.assertEqual(tuple(d), tuple(e))
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| 174 |
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| 175 | self.assertRaises(TypeError, d.rotate, 'x') # Wrong arg type
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| 176 | self.assertRaises(TypeError, d.rotate, 1, 10) # Too many args
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| 177 |
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| 178 | d = deque()
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| 179 | d.rotate() # rotate an empty deque
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| 180 | self.assertEqual(d, deque())
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| 181 |
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| 182 | def test_len(self):
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| 183 | d = deque('ab')
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| 184 | self.assertEqual(len(d), 2)
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| 185 | d.popleft()
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| 186 | self.assertEqual(len(d), 1)
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| 187 | d.pop()
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| 188 | self.assertEqual(len(d), 0)
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| 189 | self.assertRaises(IndexError, d.pop)
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| 190 | self.assertEqual(len(d), 0)
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| 191 | d.append('c')
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| 192 | self.assertEqual(len(d), 1)
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| 193 | d.appendleft('d')
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| 194 | self.assertEqual(len(d), 2)
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| 195 | d.clear()
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| 196 | self.assertEqual(len(d), 0)
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| 197 |
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| 198 | def test_underflow(self):
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| 199 | d = deque()
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| 200 | self.assertRaises(IndexError, d.pop)
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| 201 | self.assertRaises(IndexError, d.popleft)
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| 202 |
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| 203 | def test_clear(self):
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| 204 | d = deque(xrange(100))
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| 205 | self.assertEqual(len(d), 100)
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| 206 | d.clear()
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| 207 | self.assertEqual(len(d), 0)
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| 208 | self.assertEqual(list(d), [])
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| 209 | d.clear() # clear an emtpy deque
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| 210 | self.assertEqual(list(d), [])
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| 211 |
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| 212 | def test_remove(self):
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| 213 | d = deque('abcdefghcij')
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| 214 | d.remove('c')
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| 215 | self.assertEqual(d, deque('abdefghcij'))
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| 216 | d.remove('c')
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| 217 | self.assertEqual(d, deque('abdefghij'))
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| 218 | self.assertRaises(ValueError, d.remove, 'c')
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| 219 | self.assertEqual(d, deque('abdefghij'))
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| 220 |
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| 221 | # Handle comparison errors
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| 222 | d = deque(['a', 'b', BadCmp(), 'c'])
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| 223 | e = deque(d)
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| 224 | self.assertRaises(RuntimeError, d.remove, 'c')
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| 225 | for x, y in zip(d, e):
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| 226 | # verify that original order and values are retained.
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| 227 | self.assert_(x is y)
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| 228 |
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| 229 | # Handle evil mutator
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| 230 | for match in (True, False):
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| 231 | d = deque(['ab'])
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| 232 | d.extend([MutateCmp(d, match), 'c'])
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| 233 | self.assertRaises(IndexError, d.remove, 'c')
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| 234 | self.assertEqual(d, deque())
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| 235 |
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| 236 | def test_repr(self):
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| 237 | d = deque(xrange(200))
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| 238 | e = eval(repr(d))
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| 239 | self.assertEqual(list(d), list(e))
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| 240 | d.append(d)
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| 241 | self.assert_('...' in repr(d))
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| 242 |
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| 243 | def test_print(self):
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| 244 | d = deque(xrange(200))
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| 245 | d.append(d)
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| 246 | try:
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| 247 | fo = open(test_support.TESTFN, "wb")
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| 248 | print >> fo, d,
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| 249 | fo.close()
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| 250 | fo = open(test_support.TESTFN, "rb")
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| 251 | self.assertEqual(fo.read(), repr(d))
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| 252 | finally:
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| 253 | fo.close()
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| 254 | os.remove(test_support.TESTFN)
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| 255 |
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| 256 | def test_init(self):
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| 257 | self.assertRaises(TypeError, deque, 'abc', 2);
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| 258 | self.assertRaises(TypeError, deque, 1);
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| 259 |
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| 260 | def test_hash(self):
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| 261 | self.assertRaises(TypeError, hash, deque('abc'))
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| 262 |
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| 263 | def test_long_steadystate_queue_popleft(self):
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| 264 | for size in (0, 1, 2, 100, 1000):
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| 265 | d = deque(xrange(size))
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| 266 | append, pop = d.append, d.popleft
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| 267 | for i in xrange(size, BIG):
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| 268 | append(i)
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| 269 | x = pop()
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| 270 | if x != i - size:
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| 271 | self.assertEqual(x, i-size)
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| 272 | self.assertEqual(list(d), range(BIG-size, BIG))
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| 273 |
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| 274 | def test_long_steadystate_queue_popright(self):
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| 275 | for size in (0, 1, 2, 100, 1000):
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| 276 | d = deque(reversed(xrange(size)))
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| 277 | append, pop = d.appendleft, d.pop
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| 278 | for i in xrange(size, BIG):
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| 279 | append(i)
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| 280 | x = pop()
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| 281 | if x != i - size:
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| 282 | self.assertEqual(x, i-size)
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| 283 | self.assertEqual(list(reversed(list(d))), range(BIG-size, BIG))
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| 284 |
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| 285 | def test_big_queue_popleft(self):
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| 286 | pass
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| 287 | d = deque()
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| 288 | append, pop = d.append, d.popleft
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| 289 | for i in xrange(BIG):
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| 290 | append(i)
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| 291 | for i in xrange(BIG):
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| 292 | x = pop()
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| 293 | if x != i:
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| 294 | self.assertEqual(x, i)
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| 295 |
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| 296 | def test_big_queue_popright(self):
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| 297 | d = deque()
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| 298 | append, pop = d.appendleft, d.pop
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| 299 | for i in xrange(BIG):
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| 300 | append(i)
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| 301 | for i in xrange(BIG):
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| 302 | x = pop()
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| 303 | if x != i:
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| 304 | self.assertEqual(x, i)
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| 305 |
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| 306 | def test_big_stack_right(self):
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| 307 | d = deque()
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| 308 | append, pop = d.append, d.pop
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| 309 | for i in xrange(BIG):
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| 310 | append(i)
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| 311 | for i in reversed(xrange(BIG)):
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| 312 | x = pop()
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| 313 | if x != i:
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| 314 | self.assertEqual(x, i)
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| 315 | self.assertEqual(len(d), 0)
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| 316 |
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| 317 | def test_big_stack_left(self):
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| 318 | d = deque()
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| 319 | append, pop = d.appendleft, d.popleft
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| 320 | for i in xrange(BIG):
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| 321 | append(i)
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| 322 | for i in reversed(xrange(BIG)):
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| 323 | x = pop()
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| 324 | if x != i:
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| 325 | self.assertEqual(x, i)
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| 326 | self.assertEqual(len(d), 0)
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| 327 |
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| 328 | def test_roundtrip_iter_init(self):
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| 329 | d = deque(xrange(200))
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| 330 | e = deque(d)
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| 331 | self.assertNotEqual(id(d), id(e))
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| 332 | self.assertEqual(list(d), list(e))
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| 333 |
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| 334 | def test_pickle(self):
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| 335 | d = deque(xrange(200))
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| 336 | for i in (0, 1, 2):
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| 337 | s = pickle.dumps(d, i)
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| 338 | e = pickle.loads(s)
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| 339 | self.assertNotEqual(id(d), id(e))
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| 340 | self.assertEqual(list(d), list(e))
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| 341 |
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| 342 | def test_pickle_recursive(self):
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| 343 | d = deque('abc')
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| 344 | d.append(d)
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| 345 | for i in (0, 1, 2):
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| 346 | e = pickle.loads(pickle.dumps(d, i))
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| 347 | self.assertNotEqual(id(d), id(e))
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| 348 | self.assertEqual(id(e), id(e[-1]))
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| 349 |
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| 350 | def test_deepcopy(self):
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| 351 | mut = [10]
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| 352 | d = deque([mut])
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| 353 | e = copy.deepcopy(d)
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| 354 | self.assertEqual(list(d), list(e))
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| 355 | mut[0] = 11
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| 356 | self.assertNotEqual(id(d), id(e))
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| 357 | self.assertNotEqual(list(d), list(e))
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| 358 |
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| 359 | def test_copy(self):
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| 360 | mut = [10]
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| 361 | d = deque([mut])
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| 362 | e = copy.copy(d)
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| 363 | self.assertEqual(list(d), list(e))
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| 364 | mut[0] = 11
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| 365 | self.assertNotEqual(id(d), id(e))
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| 366 | self.assertEqual(list(d), list(e))
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| 367 |
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| 368 | def test_reversed(self):
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| 369 | for s in ('abcd', xrange(2000)):
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| 370 | self.assertEqual(list(reversed(deque(s))), list(reversed(s)))
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| 371 |
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| 372 | def test_gc_doesnt_blowup(self):
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| 373 | import gc
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| 374 | # This used to assert-fail in deque_traverse() under a debug
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| 375 | # build, or run wild with a NULL pointer in a release build.
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| 376 | d = deque()
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| 377 | for i in xrange(100):
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| 378 | d.append(1)
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| 379 | gc.collect()
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| 380 |
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| 381 | class TestVariousIteratorArgs(unittest.TestCase):
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| 382 |
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| 383 | def test_constructor(self):
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| 384 | for s in ("123", "", range(1000), ('do', 1.2), xrange(2000,2200,5)):
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| 385 | for g in (seq_tests.Sequence, seq_tests.IterFunc,
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| 386 | seq_tests.IterGen, seq_tests.IterFuncStop,
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| 387 | seq_tests.itermulti, seq_tests.iterfunc):
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| 388 | self.assertEqual(list(deque(g(s))), list(g(s)))
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| 389 | self.assertRaises(TypeError, deque, seq_tests.IterNextOnly(s))
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| 390 | self.assertRaises(TypeError, deque, seq_tests.IterNoNext(s))
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| 391 | self.assertRaises(ZeroDivisionError, deque, seq_tests.IterGenExc(s))
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| 392 |
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| 393 | def test_iter_with_altered_data(self):
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| 394 | d = deque('abcdefg')
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| 395 | it = iter(d)
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| 396 | d.pop()
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| 397 | self.assertRaises(RuntimeError, it.next)
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| 398 |
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| 399 | class Deque(deque):
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| 400 | pass
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| 401 |
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| 402 | class DequeWithBadIter(deque):
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| 403 | def __iter__(self):
|
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| 404 | raise TypeError
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| 405 |
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| 406 | class TestSubclass(unittest.TestCase):
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| 407 |
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| 408 | def test_basics(self):
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| 409 | d = Deque(xrange(100))
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| 410 | d.__init__(xrange(100, 200))
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| 411 | for i in xrange(200, 400):
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| 412 | d.append(i)
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| 413 | for i in reversed(xrange(-200, 0)):
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| 414 | d.appendleft(i)
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| 415 | self.assertEqual(list(d), range(-200, 400))
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| 416 | self.assertEqual(len(d), 600)
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| 417 |
|
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| 418 | left = [d.popleft() for i in xrange(250)]
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| 419 | self.assertEqual(left, range(-200, 50))
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| 420 | self.assertEqual(list(d), range(50, 400))
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| 421 |
|
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| 422 | right = [d.pop() for i in xrange(250)]
|
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| 423 | right.reverse()
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| 424 | self.assertEqual(right, range(150, 400))
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| 425 | self.assertEqual(list(d), range(50, 150))
|
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| 426 |
|
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| 427 | d.clear()
|
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| 428 | self.assertEqual(len(d), 0)
|
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| 429 |
|
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| 430 | def test_copy_pickle(self):
|
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| 431 |
|
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| 432 | d = Deque('abc')
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| 433 |
|
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| 434 | e = d.__copy__()
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| 435 | self.assertEqual(type(d), type(e))
|
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| 436 | self.assertEqual(list(d), list(e))
|
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| 437 |
|
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| 438 | e = Deque(d)
|
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| 439 | self.assertEqual(type(d), type(e))
|
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| 440 | self.assertEqual(list(d), list(e))
|
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| 441 |
|
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| 442 | s = pickle.dumps(d)
|
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| 443 | e = pickle.loads(s)
|
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| 444 | self.assertNotEqual(id(d), id(e))
|
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| 445 | self.assertEqual(type(d), type(e))
|
|---|
| 446 | self.assertEqual(list(d), list(e))
|
|---|
| 447 |
|
|---|
| 448 | def test_pickle(self):
|
|---|
| 449 | d = Deque('abc')
|
|---|
| 450 | d.append(d)
|
|---|
| 451 |
|
|---|
| 452 | e = pickle.loads(pickle.dumps(d))
|
|---|
| 453 | self.assertNotEqual(id(d), id(e))
|
|---|
| 454 | self.assertEqual(type(d), type(e))
|
|---|
| 455 | dd = d.pop()
|
|---|
| 456 | ee = e.pop()
|
|---|
| 457 | self.assertEqual(id(e), id(ee))
|
|---|
| 458 | self.assertEqual(d, e)
|
|---|
| 459 |
|
|---|
| 460 | d.x = d
|
|---|
| 461 | e = pickle.loads(pickle.dumps(d))
|
|---|
| 462 | self.assertEqual(id(e), id(e.x))
|
|---|
| 463 |
|
|---|
| 464 | d = DequeWithBadIter('abc')
|
|---|
| 465 | self.assertRaises(TypeError, pickle.dumps, d)
|
|---|
| 466 |
|
|---|
| 467 | def test_weakref(self):
|
|---|
| 468 | d = deque('gallahad')
|
|---|
| 469 | p = proxy(d)
|
|---|
| 470 | self.assertEqual(str(p), str(d))
|
|---|
| 471 | d = None
|
|---|
| 472 | self.assertRaises(ReferenceError, str, p)
|
|---|
| 473 |
|
|---|
| 474 | def test_strange_subclass(self):
|
|---|
| 475 | class X(deque):
|
|---|
| 476 | def __iter__(self):
|
|---|
| 477 | return iter([])
|
|---|
| 478 | d1 = X([1,2,3])
|
|---|
| 479 | d2 = X([4,5,6])
|
|---|
| 480 | d1 == d2 # not clear if this is supposed to be True or False,
|
|---|
| 481 | # but it used to give a SystemError
|
|---|
| 482 |
|
|---|
| 483 | #==============================================================================
|
|---|
| 484 |
|
|---|
| 485 | libreftest = """
|
|---|
| 486 | Example from the Library Reference: Doc/lib/libcollections.tex
|
|---|
| 487 |
|
|---|
| 488 | >>> from collections import deque
|
|---|
| 489 | >>> d = deque('ghi') # make a new deque with three items
|
|---|
| 490 | >>> for elem in d: # iterate over the deque's elements
|
|---|
| 491 | ... print elem.upper()
|
|---|
| 492 | G
|
|---|
| 493 | H
|
|---|
| 494 | I
|
|---|
| 495 | >>> d.append('j') # add a new entry to the right side
|
|---|
| 496 | >>> d.appendleft('f') # add a new entry to the left side
|
|---|
| 497 | >>> d # show the representation of the deque
|
|---|
| 498 | deque(['f', 'g', 'h', 'i', 'j'])
|
|---|
| 499 | >>> d.pop() # return and remove the rightmost item
|
|---|
| 500 | 'j'
|
|---|
| 501 | >>> d.popleft() # return and remove the leftmost item
|
|---|
| 502 | 'f'
|
|---|
| 503 | >>> list(d) # list the contents of the deque
|
|---|
| 504 | ['g', 'h', 'i']
|
|---|
| 505 | >>> d[0] # peek at leftmost item
|
|---|
| 506 | 'g'
|
|---|
| 507 | >>> d[-1] # peek at rightmost item
|
|---|
| 508 | 'i'
|
|---|
| 509 | >>> list(reversed(d)) # list the contents of a deque in reverse
|
|---|
| 510 | ['i', 'h', 'g']
|
|---|
| 511 | >>> 'h' in d # search the deque
|
|---|
| 512 | True
|
|---|
| 513 | >>> d.extend('jkl') # add multiple elements at once
|
|---|
| 514 | >>> d
|
|---|
| 515 | deque(['g', 'h', 'i', 'j', 'k', 'l'])
|
|---|
| 516 | >>> d.rotate(1) # right rotation
|
|---|
| 517 | >>> d
|
|---|
| 518 | deque(['l', 'g', 'h', 'i', 'j', 'k'])
|
|---|
| 519 | >>> d.rotate(-1) # left rotation
|
|---|
| 520 | >>> d
|
|---|
| 521 | deque(['g', 'h', 'i', 'j', 'k', 'l'])
|
|---|
| 522 | >>> deque(reversed(d)) # make a new deque in reverse order
|
|---|
| 523 | deque(['l', 'k', 'j', 'i', 'h', 'g'])
|
|---|
| 524 | >>> d.clear() # empty the deque
|
|---|
| 525 | >>> d.pop() # cannot pop from an empty deque
|
|---|
| 526 | Traceback (most recent call last):
|
|---|
| 527 | File "<pyshell#6>", line 1, in -toplevel-
|
|---|
| 528 | d.pop()
|
|---|
| 529 | IndexError: pop from an empty deque
|
|---|
| 530 |
|
|---|
| 531 | >>> d.extendleft('abc') # extendleft() reverses the input order
|
|---|
| 532 | >>> d
|
|---|
| 533 | deque(['c', 'b', 'a'])
|
|---|
| 534 |
|
|---|
| 535 |
|
|---|
| 536 |
|
|---|
| 537 | >>> def delete_nth(d, n):
|
|---|
| 538 | ... d.rotate(-n)
|
|---|
| 539 | ... d.popleft()
|
|---|
| 540 | ... d.rotate(n)
|
|---|
| 541 | ...
|
|---|
| 542 | >>> d = deque('abcdef')
|
|---|
| 543 | >>> delete_nth(d, 2) # remove the entry at d[2]
|
|---|
| 544 | >>> d
|
|---|
| 545 | deque(['a', 'b', 'd', 'e', 'f'])
|
|---|
| 546 |
|
|---|
| 547 |
|
|---|
| 548 |
|
|---|
| 549 | >>> def roundrobin(*iterables):
|
|---|
| 550 | ... pending = deque(iter(i) for i in iterables)
|
|---|
| 551 | ... while pending:
|
|---|
| 552 | ... task = pending.popleft()
|
|---|
| 553 | ... try:
|
|---|
| 554 | ... yield task.next()
|
|---|
| 555 | ... except StopIteration:
|
|---|
| 556 | ... continue
|
|---|
| 557 | ... pending.append(task)
|
|---|
| 558 | ...
|
|---|
| 559 |
|
|---|
| 560 | >>> for value in roundrobin('abc', 'd', 'efgh'):
|
|---|
| 561 | ... print value
|
|---|
| 562 | ...
|
|---|
| 563 | a
|
|---|
| 564 | d
|
|---|
| 565 | e
|
|---|
| 566 | b
|
|---|
| 567 | f
|
|---|
| 568 | c
|
|---|
| 569 | g
|
|---|
| 570 | h
|
|---|
| 571 |
|
|---|
| 572 |
|
|---|
| 573 | >>> def maketree(iterable):
|
|---|
| 574 | ... d = deque(iterable)
|
|---|
| 575 | ... while len(d) > 1:
|
|---|
| 576 | ... pair = [d.popleft(), d.popleft()]
|
|---|
| 577 | ... d.append(pair)
|
|---|
| 578 | ... return list(d)
|
|---|
| 579 | ...
|
|---|
| 580 | >>> print maketree('abcdefgh')
|
|---|
| 581 | [[[['a', 'b'], ['c', 'd']], [['e', 'f'], ['g', 'h']]]]
|
|---|
| 582 |
|
|---|
| 583 | """
|
|---|
| 584 |
|
|---|
| 585 |
|
|---|
| 586 | #==============================================================================
|
|---|
| 587 |
|
|---|
| 588 | __test__ = {'libreftest' : libreftest}
|
|---|
| 589 |
|
|---|
| 590 | def test_main(verbose=None):
|
|---|
| 591 | import sys
|
|---|
| 592 | test_classes = (
|
|---|
| 593 | TestBasic,
|
|---|
| 594 | TestVariousIteratorArgs,
|
|---|
| 595 | TestSubclass,
|
|---|
| 596 | )
|
|---|
| 597 |
|
|---|
| 598 | test_support.run_unittest(*test_classes)
|
|---|
| 599 |
|
|---|
| 600 | # verify reference counting
|
|---|
| 601 | if verbose and hasattr(sys, "gettotalrefcount"):
|
|---|
| 602 | import gc
|
|---|
| 603 | counts = [None] * 5
|
|---|
| 604 | for i in xrange(len(counts)):
|
|---|
| 605 | test_support.run_unittest(*test_classes)
|
|---|
| 606 | gc.collect()
|
|---|
| 607 | counts[i] = sys.gettotalrefcount()
|
|---|
| 608 | print counts
|
|---|
| 609 |
|
|---|
| 610 | # doctests
|
|---|
| 611 | from test import test_deque
|
|---|
| 612 | test_support.run_doctest(test_deque, verbose)
|
|---|
| 613 |
|
|---|
| 614 | if __name__ == "__main__":
|
|---|
| 615 | test_main(verbose=True)
|
|---|
