1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
Lib/test/test_deque.py
from collections import deque
import unittest
from test import test_support, seq_tests
import gc
import weakref
import copy
import cPickle as pickle
import random
import struct

BIG = 100000

def fail():
    raise SyntaxError
    yield 1

class BadCmp:
    def __eq__(self, other):
        raise RuntimeError

class MutateCmp:
    def __init__(self, deque, result):
        self.deque = deque
        self.result = result
    def __eq__(self, other):
        self.deque.clear()
        return self.result

class TestBasic(unittest.TestCase):

    def test_basics(self):
        d = deque(xrange(-5125, -5000))
        d.__init__(xrange(200))
        for i in xrange(200, 400):
            d.append(i)
        for i in reversed(xrange(-200, 0)):
            d.appendleft(i)
        self.assertEqual(list(d), range(-200, 400))
        self.assertEqual(len(d), 600)

        left = [d.popleft() for i in xrange(250)]
        self.assertEqual(left, range(-200, 50))
        self.assertEqual(list(d), range(50, 400))

        right = [d.pop() for i in xrange(250)]
        right.reverse()
        self.assertEqual(right, range(150, 400))
        self.assertEqual(list(d), range(50, 150))

    def test_maxlen(self):
        self.assertRaises(ValueError, deque, 'abc', -1)
        self.assertRaises(ValueError, deque, 'abc', -2)
        it = iter(range(10))
        d = deque(it, maxlen=3)
        self.assertEqual(list(it), [])
        self.assertEqual(repr(d), 'deque([7, 8, 9], maxlen=3)')
        self.assertEqual(list(d), range(7, 10))
        self.assertEqual(d, deque(range(10), 3))
        d.append(10)
        self.assertEqual(list(d), range(8, 11))
        d.appendleft(7)
        self.assertEqual(list(d), range(7, 10))
        d.extend([10, 11])
        self.assertEqual(list(d), range(9, 12))
        d.extendleft([8, 7])
        self.assertEqual(list(d), range(7, 10))
        d = deque(xrange(200), maxlen=10)
        d.append(d)
        test_support.unlink(test_support.TESTFN)
        fo = open(test_support.TESTFN, "wb")
        try:
            print >> fo, d,
            fo.close()
            fo = open(test_support.TESTFN, "rb")
            self.assertEqual(fo.read(), repr(d))
        finally:
            fo.close()
            test_support.unlink(test_support.TESTFN)

        d = deque(range(10), maxlen=None)
        self.assertEqual(repr(d), 'deque([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])')
        fo = open(test_support.TESTFN, "wb")
        try:
            print >> fo, d,
            fo.close()
            fo = open(test_support.TESTFN, "rb")
            self.assertEqual(fo.read(), repr(d))
        finally:
            fo.close()
            test_support.unlink(test_support.TESTFN)

    def test_maxlen_zero(self):
        it = iter(range(100))
        deque(it, maxlen=0)
        self.assertEqual(list(it), [])

        it = iter(range(100))
        d = deque(maxlen=0)
        d.extend(it)
        self.assertEqual(list(it), [])

        it = iter(range(100))
        d = deque(maxlen=0)
        d.extendleft(it)
        self.assertEqual(list(it), [])

    def test_maxlen_attribute(self):
        self.assertEqual(deque().maxlen, None)
        self.assertEqual(deque('abc').maxlen, None)
        self.assertEqual(deque('abc', maxlen=4).maxlen, 4)
        self.assertEqual(deque('abc', maxlen=2).maxlen, 2)
        self.assertEqual(deque('abc', maxlen=0).maxlen, 0)
        with self.assertRaises(AttributeError):
            d = deque('abc')
            d.maxlen = 10

    def test_count(self):
        for s in ('', 'abracadabra', 'simsalabim'*500+'abc'):
            s = list(s)
            d = deque(s)
            for letter in 'abcdefghijklmnopqrstuvwxyz':
                self.assertEqual(s.count(letter), d.count(letter), (s, d, letter))
        self.assertRaises(TypeError, d.count)       # too few args
        self.assertRaises(TypeError, d.count, 1, 2) # too many args
        class BadCompare:
            def __eq__(self, other):
                raise ArithmeticError
        d = deque([1, 2, BadCompare(), 3])
        self.assertRaises(ArithmeticError, d.count, 2)
        d = deque([1, 2, 3])
        self.assertRaises(ArithmeticError, d.count, BadCompare())
        class MutatingCompare:
            def __eq__(self, other):
                self.d.pop()
                return True
        m = MutatingCompare()
        d = deque([1, 2, 3, m, 4, 5])
        m.d = d
        self.assertRaises(RuntimeError, d.count, 3)

        # test issue11004
        # block advance failed after rotation aligned elements on right side of block
        d = deque([None]*16)
        for i in range(len(d)):
            d.rotate(-1)
        d.rotate(1)
        self.assertEqual(d.count(1), 0)
        self.assertEqual(d.count(None), 16)

    def test_comparisons(self):
        d = deque('xabc'); d.popleft()
        for e in [d, deque('abc'), deque('ab'), deque(), list(d)]:
            self.assertEqual(d==e, type(d)==type(e) and list(d)==list(e))
            self.assertEqual(d!=e, not(type(d)==type(e) and list(d)==list(e)))

        args = map(deque, ('', 'a', 'b', 'ab', 'ba', 'abc', 'xba', 'xabc', 'cba'))
        for x in args:
            for y in args:
                self.assertEqual(x == y, list(x) == list(y), (x,y))
                self.assertEqual(x != y, list(x) != list(y), (x,y))
                self.assertEqual(x <  y, list(x) <  list(y), (x,y))
                self.assertEqual(x <= y, list(x) <= list(y), (x,y))
                self.assertEqual(x >  y, list(x) >  list(y), (x,y))
                self.assertEqual(x >= y, list(x) >= list(y), (x,y))
                self.assertEqual(cmp(x,y), cmp(list(x),list(y)), (x,y))

    def test_extend(self):
        d = deque('a')
        self.assertRaises(TypeError, d.extend, 1)
        d.extend('bcd')
        self.assertEqual(list(d), list('abcd'))
        d.extend(d)
        self.assertEqual(list(d), list('abcdabcd'))

    def test_iadd(self):
        d = deque('a')
        d += 'bcd'
        self.assertEqual(list(d), list('abcd'))
        d += d
        self.assertEqual(list(d), list('abcdabcd'))

    def test_extendleft(self):
        d = deque('a')
        self.assertRaises(TypeError, d.extendleft, 1)
        d.extendleft('bcd')
        self.assertEqual(list(d), list(reversed('abcd')))
        d.extendleft(d)
        self.assertEqual(list(d), list('abcddcba'))
        d = deque()
        d.extendleft(range(1000))
        self.assertEqual(list(d), list(reversed(range(1000))))
        self.assertRaises(SyntaxError, d.extendleft, fail())

    def test_getitem(self):
        n = 200
        d = deque(xrange(n))
        l = range(n)
        for i in xrange(n):
            d.popleft()
            l.pop(0)
            if random.random() < 0.5:
                d.append(i)
                l.append(i)
            for j in xrange(1-len(l), len(l)):
                assert d[j] == l[j]

        d = deque('superman')
        self.assertEqual(d[0], 's')
        self.assertEqual(d[-1], 'n')
        d = deque()
        self.assertRaises(IndexError, d.__getitem__, 0)
        self.assertRaises(IndexError, d.__getitem__, -1)

    def test_setitem(self):
        n = 200
        d = deque(xrange(n))
        for i in xrange(n):
            d[i] = 10 * i
        self.assertEqual(list(d), [10*i for i in xrange(n)])
        l = list(d)
        for i in xrange(1-n, 0, -1):
            d[i] = 7*i
            l[i] = 7*i
        self.assertEqual(list(d), l)

    def test_delitem(self):
        n = 500         # O(n**2) test, don't make this too big
        d = deque(xrange(n))
        self.assertRaises(IndexError, d.__delitem__, -n-1)
        self.assertRaises(IndexError, d.__delitem__, n)
        for i in xrange(n):
            self.assertEqual(len(d), n-i)
            j = random.randrange(-len(d), len(d))
            val = d[j]
            self.assertIn(val, d)
            del d[j]
            self.assertNotIn(val, d)
        self.assertEqual(len(d), 0)

    def test_reverse(self):
        n = 500         # O(n**2) test, don't make this too big
        data = [random.random() for i in range(n)]
        for i in range(n):
            d = deque(data[:i])
            r = d.reverse()
            self.assertEqual(list(d), list(reversed(data[:i])))
            self.assertIs(r, None)
            d.reverse()
            self.assertEqual(list(d), data[:i])
        self.assertRaises(TypeError, d.reverse, 1)          # Arity is zero

    def test_rotate(self):
        s = tuple('abcde')
        n = len(s)

        d = deque(s)
        d.rotate(1)             # verify rot(1)
        self.assertEqual(''.join(d), 'eabcd')

        d = deque(s)
        d.rotate(-1)            # verify rot(-1)
        self.assertEqual(''.join(d), 'bcdea')
        d.rotate()              # check default to 1
        self.assertEqual(tuple(d), s)

        for i in xrange(n*3):
            d = deque(s)
            e = deque(d)
            d.rotate(i)         # check vs. rot(1) n times
            for j in xrange(i):
                e.rotate(1)
            self.assertEqual(tuple(d), tuple(e))
            d.rotate(-i)        # check that it works in reverse
            self.assertEqual(tuple(d), s)
            e.rotate(n-i)       # check that it wraps forward
            self.assertEqual(tuple(e), s)

        for i in xrange(n*3):
            d = deque(s)
            e = deque(d)
            d.rotate(-i)
            for j in xrange(i):
                e.rotate(-1)    # check vs. rot(-1) n times
            self.assertEqual(tuple(d), tuple(e))
            d.rotate(i)         # check that it works in reverse
            self.assertEqual(tuple(d), s)
            e.rotate(i-n)       # check that it wraps backaround
            self.assertEqual(tuple(e), s)

        d = deque(s)
        e = deque(s)
        e.rotate(BIG+17)        # verify on long series of rotates
        dr = d.rotate
        for i in xrange(BIG+17):
            dr()
        self.assertEqual(tuple(d), tuple(e))

        self.assertRaises(TypeError, d.rotate, 'x')   # Wrong arg type
        self.assertRaises(TypeError, d.rotate, 1, 10) # Too many args

        d = deque()
        d.rotate()              # rotate an empty deque
        self.assertEqual(d, deque())

    def test_len(self):
        d = deque('ab')
        self.assertEqual(len(d), 2)
        d.popleft()
        self.assertEqual(len(d), 1)
        d.pop()
        self.assertEqual(len(d), 0)
        self.assertRaises(IndexError, d.pop)
        self.assertEqual(len(d), 0)
        d.append('c')
        self.assertEqual(len(d), 1)
        d.appendleft('d')
        self.assertEqual(len(d), 2)
        d.clear()
        self.assertEqual(len(d), 0)

    def test_underflow(self):
        d = deque()
        self.assertRaises(IndexError, d.pop)
        self.assertRaises(IndexError, d.popleft)

    def test_clear(self):
        d = deque(xrange(100))
        self.assertEqual(len(d), 100)
        d.clear()
        self.assertEqual(len(d), 0)
        self.assertEqual(list(d), [])
        d.clear()               # clear an emtpy deque
        self.assertEqual(list(d), [])

    def test_remove(self):
        d = deque('abcdefghcij')
        d.remove('c')
        self.assertEqual(d, deque('abdefghcij'))
        d.remove('c')
        self.assertEqual(d, deque('abdefghij'))
        self.assertRaises(ValueError, d.remove, 'c')
        self.assertEqual(d, deque('abdefghij'))

        # Handle comparison errors
        d = deque(['a', 'b', BadCmp(), 'c'])
        e = deque(d)
        self.assertRaises(RuntimeError, d.remove, 'c')
        for x, y in zip(d, e):
            # verify that original order and values are retained.
            self.assertTrue(x is y)

        # Handle evil mutator
        for match in (True, False):
            d = deque(['ab'])
            d.extend([MutateCmp(d, match), 'c'])
            self.assertRaises(IndexError, d.remove, 'c')
            self.assertEqual(d, deque())

    def test_repr(self):
        d = deque(xrange(200))
        e = eval(repr(d))
        self.assertEqual(list(d), list(e))
        d.append(d)
        self.assertIn('...', repr(d))

    def test_print(self):
        d = deque(xrange(200))
        d.append(d)
        test_support.unlink(test_support.TESTFN)
        fo = open(test_support.TESTFN, "wb")
        try:
            print >> fo, d,
            fo.close()
            fo = open(test_support.TESTFN, "rb")
            self.assertEqual(fo.read(), repr(d))
        finally:
            fo.close()
            test_support.unlink(test_support.TESTFN)

    def test_init(self):
        self.assertRaises(TypeError, deque, 'abc', 2, 3);
        self.assertRaises(TypeError, deque, 1);

    def test_hash(self):
        self.assertRaises(TypeError, hash, deque('abc'))

    def test_long_steadystate_queue_popleft(self):
        for size in (0, 1, 2, 100, 1000):
            d = deque(xrange(size))
            append, pop = d.append, d.popleft
            for i in xrange(size, BIG):
                append(i)
                x = pop()
                if x != i - size:
                    self.assertEqual(x, i-size)
            self.assertEqual(list(d), range(BIG-size, BIG))

    def test_long_steadystate_queue_popright(self):
        for size in (0, 1, 2, 100, 1000):
            d = deque(reversed(xrange(size)))
            append, pop = d.appendleft, d.pop
            for i in xrange(size, BIG):
                append(i)
                x = pop()
                if x != i - size:
                    self.assertEqual(x, i-size)
            self.assertEqual(list(reversed(list(d))), range(BIG-size, BIG))

    def test_big_queue_popleft(self):
        pass
        d = deque()
        append, pop = d.append, d.popleft
        for i in xrange(BIG):
            append(i)
        for i in xrange(BIG):
            x = pop()
            if x != i:
                self.assertEqual(x, i)

    def test_big_queue_popright(self):
        d = deque()
        append, pop = d.appendleft, d.pop
        for i in xrange(BIG):
            append(i)
        for i in xrange(BIG):
            x = pop()
            if x != i:
                self.assertEqual(x, i)

    def test_big_stack_right(self):
        d = deque()
        append, pop = d.append, d.pop
        for i in xrange(BIG):
            append(i)
        for i in reversed(xrange(BIG)):
            x = pop()
            if x != i:
                self.assertEqual(x, i)
        self.assertEqual(len(d), 0)

    def test_big_stack_left(self):
        d = deque()
        append, pop = d.appendleft, d.popleft
        for i in xrange(BIG):
            append(i)
        for i in reversed(xrange(BIG)):
            x = pop()
            if x != i:
                self.assertEqual(x, i)
        self.assertEqual(len(d), 0)

    def test_roundtrip_iter_init(self):
        d = deque(xrange(200))
        e = deque(d)
        self.assertNotEqual(id(d), id(e))
        self.assertEqual(list(d), list(e))

    def test_pickle(self):
        d = deque(xrange(200))
        for i in range(pickle.HIGHEST_PROTOCOL + 1):
            s = pickle.dumps(d, i)
            e = pickle.loads(s)
            self.assertNotEqual(id(d), id(e))
            self.assertEqual(list(d), list(e))

##    def test_pickle_recursive(self):
##        d = deque('abc')
##        d.append(d)
##        for i in range(pickle.HIGHEST_PROTOCOL + 1):
##            e = pickle.loads(pickle.dumps(d, i))
##            self.assertNotEqual(id(d), id(e))
##            self.assertEqual(id(e), id(e[-1]))

    def test_deepcopy(self):
        mut = [10]
        d = deque([mut])
        e = copy.deepcopy(d)
        self.assertEqual(list(d), list(e))
        mut[0] = 11
        self.assertNotEqual(id(d), id(e))
        self.assertNotEqual(list(d), list(e))

    def test_copy(self):
        mut = [10]
        d = deque([mut])
        e = copy.copy(d)
        self.assertEqual(list(d), list(e))
        mut[0] = 11
        self.assertNotEqual(id(d), id(e))
        self.assertEqual(list(d), list(e))

    def test_reversed(self):
        for s in ('abcd', xrange(2000)):
            self.assertEqual(list(reversed(deque(s))), list(reversed(s)))

    def test_gc_doesnt_blowup(self):
        import gc
        # This used to assert-fail in deque_traverse() under a debug
        # build, or run wild with a NULL pointer in a release build.
        d = deque()
        for i in xrange(100):
            d.append(1)
            gc.collect()

    def test_container_iterator(self):
        # Bug #3680: tp_traverse was not implemented for deque iterator objects
        class C(object):
            pass
        for i in range(2):
            obj = C()
            ref = weakref.ref(obj)
            if i == 0:
                container = deque([obj, 1])
            else:
                container = reversed(deque([obj, 1]))
            obj.x = iter(container)
            del obj, container
            gc.collect()
            self.assertTrue(ref() is None, "Cycle was not collected")

    check_sizeof = test_support.check_sizeof

    @test_support.cpython_only
    def test_sizeof(self):
        BLOCKLEN = 62
        basesize = test_support.calcobjsize('2P4PlP')
        blocksize = struct.calcsize('2P%dP' % BLOCKLEN)
        self.assertEqual(object.__sizeof__(deque()), basesize)
        check = self.check_sizeof
        check(deque(), basesize + blocksize)
        check(deque('a'), basesize + blocksize)
        check(deque('a' * (BLOCKLEN // 2)), basesize + blocksize)
        check(deque('a' * (BLOCKLEN // 2 + 1)), basesize + 2 * blocksize)
        check(deque('a' * (42 * BLOCKLEN)), basesize + 43 * blocksize)

class TestVariousIteratorArgs(unittest.TestCase):

    def test_constructor(self):
        for s in ("123", "", range(1000), ('do', 1.2), xrange(2000,2200,5)):
            for g in (seq_tests.Sequence, seq_tests.IterFunc,
                      seq_tests.IterGen, seq_tests.IterFuncStop,
                      seq_tests.itermulti, seq_tests.iterfunc):
                self.assertEqual(list(deque(g(s))), list(g(s)))
            self.assertRaises(TypeError, deque, seq_tests.IterNextOnly(s))
            self.assertRaises(TypeError, deque, seq_tests.IterNoNext(s))
            self.assertRaises(ZeroDivisionError, deque, seq_tests.IterGenExc(s))

    def test_iter_with_altered_data(self):
        d = deque('abcdefg')
        it = iter(d)
        d.pop()
        self.assertRaises(RuntimeError, it.next)

    def test_runtime_error_on_empty_deque(self):
        d = deque()
        it = iter(d)
        d.append(10)
        self.assertRaises(RuntimeError, it.next)

class Deque(deque):
    pass

class DequeWithBadIter(deque):
    def __iter__(self):
        raise TypeError

class TestSubclass(unittest.TestCase):

    def test_basics(self):
        d = Deque(xrange(25))
        d.__init__(xrange(200))
        for i in xrange(200, 400):
            d.append(i)
        for i in reversed(xrange(-200, 0)):
            d.appendleft(i)
        self.assertEqual(list(d), range(-200, 400))
        self.assertEqual(len(d), 600)

        left = [d.popleft() for i in xrange(250)]
        self.assertEqual(left, range(-200, 50))
        self.assertEqual(list(d), range(50, 400))

        right = [d.pop() for i in xrange(250)]
        right.reverse()
        self.assertEqual(right, range(150, 400))
        self.assertEqual(list(d), range(50, 150))

        d.clear()
        self.assertEqual(len(d), 0)

    def test_copy_pickle(self):

        d = Deque('abc')

        e = d.__copy__()
        self.assertEqual(type(d), type(e))
        self.assertEqual(list(d), list(e))

        e = Deque(d)
        self.assertEqual(type(d), type(e))
        self.assertEqual(list(d), list(e))

        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            s = pickle.dumps(d, proto)
            e = pickle.loads(s)
            self.assertNotEqual(id(d), id(e))
            self.assertEqual(type(d), type(e))
            self.assertEqual(list(d), list(e))

        d = Deque('abcde', maxlen=4)

        e = d.__copy__()
        self.assertEqual(type(d), type(e))
        self.assertEqual(list(d), list(e))

        e = Deque(d)
        self.assertEqual(type(d), type(e))
        self.assertEqual(list(d), list(e))

        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            s = pickle.dumps(d, proto)
            e = pickle.loads(s)
            self.assertNotEqual(id(d), id(e))
            self.assertEqual(type(d), type(e))
            self.assertEqual(list(d), list(e))

##    def test_pickle(self):
##        d = Deque('abc')
##        d.append(d)
##
##        e = pickle.loads(pickle.dumps(d))
##        self.assertNotEqual(id(d), id(e))
##        self.assertEqual(type(d), type(e))
##        dd = d.pop()
##        ee = e.pop()
##        self.assertEqual(id(e), id(ee))
##        self.assertEqual(d, e)
##
##        d.x = d
##        e = pickle.loads(pickle.dumps(d))
##        self.assertEqual(id(e), id(e.x))
##
##        d = DequeWithBadIter('abc')
##        self.assertRaises(TypeError, pickle.dumps, d)

    def test_weakref(self):
        d = deque('gallahad')
        p = weakref.proxy(d)
        self.assertEqual(str(p), str(d))
        d = None
        self.assertRaises(ReferenceError, str, p)

    def test_strange_subclass(self):
        class X(deque):
            def __iter__(self):
                return iter([])
        d1 = X([1,2,3])
        d2 = X([4,5,6])
        d1 == d2   # not clear if this is supposed to be True or False,
                   # but it used to give a SystemError


class SubclassWithKwargs(deque):
    def __init__(self, newarg=1):
        deque.__init__(self)

class TestSubclassWithKwargs(unittest.TestCase):
    def test_subclass_with_kwargs(self):
        # SF bug #1486663 -- this used to erroneously raise a TypeError
        SubclassWithKwargs(newarg=1)

#==============================================================================

libreftest = """
Example from the Library Reference:  Doc/lib/libcollections.tex

>>> from collections import deque
>>> d = deque('ghi')                 # make a new deque with three items
>>> for elem in d:                   # iterate over the deque's elements
...     print elem.upper()
G
H
I
>>> d.append('j')                    # add a new entry to the right side
>>> d.appendleft('f')                # add a new entry to the left side
>>> d                                # show the representation of the deque
deque(['f', 'g', 'h', 'i', 'j'])
>>> d.pop()                          # return and remove the rightmost item
'j'
>>> d.popleft()                      # return and remove the leftmost item
'f'
>>> list(d)                          # list the contents of the deque
['g', 'h', 'i']
>>> d[0]                             # peek at leftmost item
'g'
>>> d[-1]                            # peek at rightmost item
'i'
>>> list(reversed(d))                # list the contents of a deque in reverse
['i', 'h', 'g']
>>> 'h' in d                         # search the deque
True
>>> d.extend('jkl')                  # add multiple elements at once
>>> d
deque(['g', 'h', 'i', 'j', 'k', 'l'])
>>> d.rotate(1)                      # right rotation
>>> d
deque(['l', 'g', 'h', 'i', 'j', 'k'])
>>> d.rotate(-1)                     # left rotation
>>> d
deque(['g', 'h', 'i', 'j', 'k', 'l'])
>>> deque(reversed(d))               # make a new deque in reverse order
deque(['l', 'k', 'j', 'i', 'h', 'g'])
>>> d.clear()                        # empty the deque
>>> d.pop()                          # cannot pop from an empty deque
Traceback (most recent call last):
  File "<pyshell#6>", line 1, in -toplevel-
    d.pop()
IndexError: pop from an empty deque

>>> d.extendleft('abc')              # extendleft() reverses the input order
>>> d
deque(['c', 'b', 'a'])



>>> def delete_nth(d, n):
...     d.rotate(-n)
...     d.popleft()
...     d.rotate(n)
...
>>> d = deque('abcdef')
>>> delete_nth(d, 2)   # remove the entry at d[2]
>>> d
deque(['a', 'b', 'd', 'e', 'f'])



>>> def roundrobin(*iterables):
...     pending = deque(iter(i) for i in iterables)
...     while pending:
...         task = pending.popleft()
...         try:
...             yield task.next()
...         except StopIteration:
...             continue
...         pending.append(task)
...

>>> for value in roundrobin('abc', 'd', 'efgh'):
...     print value
...
a
d
e
b
f
c
g
h


>>> def maketree(iterable):
...     d = deque(iterable)
...     while len(d) > 1:
...         pair = [d.popleft(), d.popleft()]
...         d.append(pair)
...     return list(d)
...
>>> print maketree('abcdefgh')
[[[['a', 'b'], ['c', 'd']], [['e', 'f'], ['g', 'h']]]]

"""


#==============================================================================

__test__ = {'libreftest' : libreftest}

def test_main(verbose=None):
    import sys
    test_classes = (
        TestBasic,
        TestVariousIteratorArgs,
        TestSubclass,
        TestSubclassWithKwargs,
    )

    test_support.run_unittest(*test_classes)

    # verify reference counting
    if verbose and hasattr(sys, "gettotalrefcount"):
        import gc
        counts = [None] * 5
        for i in xrange(len(counts)):
            test_support.run_unittest(*test_classes)
            gc.collect()
            counts[i] = sys.gettotalrefcount()
        print counts

    # doctests
    from test import test_deque
    test_support.run_doctest(test_deque, verbose)

if __name__ == "__main__":
    test_main(verbose=True)