This file is indexed.

/usr/lib/python3.7/test/test_copy.py is in libpython3.7-testsuite 3.7.0~b3-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
"""Unit tests for the copy module."""

import copy
import copyreg
import weakref
import abc
from operator import le, lt, ge, gt, eq, ne

import unittest

order_comparisons = le, lt, ge, gt
equality_comparisons = eq, ne
comparisons = order_comparisons + equality_comparisons

class TestCopy(unittest.TestCase):

    # Attempt full line coverage of copy.py from top to bottom

    def test_exceptions(self):
        self.assertIs(copy.Error, copy.error)
        self.assertTrue(issubclass(copy.Error, Exception))

    # The copy() method

    def test_copy_basic(self):
        x = 42
        y = copy.copy(x)
        self.assertEqual(x, y)

    def test_copy_copy(self):
        class C(object):
            def __init__(self, foo):
                self.foo = foo
            def __copy__(self):
                return C(self.foo)
        x = C(42)
        y = copy.copy(x)
        self.assertEqual(y.__class__, x.__class__)
        self.assertEqual(y.foo, x.foo)

    def test_copy_registry(self):
        class C(object):
            def __new__(cls, foo):
                obj = object.__new__(cls)
                obj.foo = foo
                return obj
        def pickle_C(obj):
            return (C, (obj.foo,))
        x = C(42)
        self.assertRaises(TypeError, copy.copy, x)
        copyreg.pickle(C, pickle_C, C)
        y = copy.copy(x)

    def test_copy_reduce_ex(self):
        class C(object):
            def __reduce_ex__(self, proto):
                c.append(1)
                return ""
            def __reduce__(self):
                self.fail("shouldn't call this")
        c = []
        x = C()
        y = copy.copy(x)
        self.assertIs(y, x)
        self.assertEqual(c, [1])

    def test_copy_reduce(self):
        class C(object):
            def __reduce__(self):
                c.append(1)
                return ""
        c = []
        x = C()
        y = copy.copy(x)
        self.assertIs(y, x)
        self.assertEqual(c, [1])

    def test_copy_cant(self):
        class C(object):
            def __getattribute__(self, name):
                if name.startswith("__reduce"):
                    raise AttributeError(name)
                return object.__getattribute__(self, name)
        x = C()
        self.assertRaises(copy.Error, copy.copy, x)

    # Type-specific _copy_xxx() methods

    def test_copy_atomic(self):
        class Classic:
            pass
        class NewStyle(object):
            pass
        def f():
            pass
        class WithMetaclass(metaclass=abc.ABCMeta):
            pass
        tests = [None, ..., NotImplemented,
                 42, 2**100, 3.14, True, False, 1j,
                 "hello", "hello\u1234", f.__code__,
                 b"world", bytes(range(256)), range(10), slice(1, 10, 2),
                 NewStyle, Classic, max, WithMetaclass]
        for x in tests:
            self.assertIs(copy.copy(x), x)

    def test_copy_list(self):
        x = [1, 2, 3]
        y = copy.copy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        x = []
        y = copy.copy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)

    def test_copy_tuple(self):
        x = (1, 2, 3)
        self.assertIs(copy.copy(x), x)
        x = ()
        self.assertIs(copy.copy(x), x)
        x = (1, 2, 3, [])
        self.assertIs(copy.copy(x), x)

    def test_copy_dict(self):
        x = {"foo": 1, "bar": 2}
        y = copy.copy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        x = {}
        y = copy.copy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)

    def test_copy_set(self):
        x = {1, 2, 3}
        y = copy.copy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        x = set()
        y = copy.copy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)

    def test_copy_frozenset(self):
        x = frozenset({1, 2, 3})
        self.assertIs(copy.copy(x), x)
        x = frozenset()
        self.assertIs(copy.copy(x), x)

    def test_copy_bytearray(self):
        x = bytearray(b'abc')
        y = copy.copy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        x = bytearray()
        y = copy.copy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)

    def test_copy_inst_vanilla(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __eq__(self, other):
                return self.foo == other.foo
        x = C(42)
        self.assertEqual(copy.copy(x), x)

    def test_copy_inst_copy(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __copy__(self):
                return C(self.foo)
            def __eq__(self, other):
                return self.foo == other.foo
        x = C(42)
        self.assertEqual(copy.copy(x), x)

    def test_copy_inst_getinitargs(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __getinitargs__(self):
                return (self.foo,)
            def __eq__(self, other):
                return self.foo == other.foo
        x = C(42)
        self.assertEqual(copy.copy(x), x)

    def test_copy_inst_getnewargs(self):
        class C(int):
            def __new__(cls, foo):
                self = int.__new__(cls)
                self.foo = foo
                return self
            def __getnewargs__(self):
                return self.foo,
            def __eq__(self, other):
                return self.foo == other.foo
        x = C(42)
        y = copy.copy(x)
        self.assertIsInstance(y, C)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertEqual(y.foo, x.foo)

    def test_copy_inst_getnewargs_ex(self):
        class C(int):
            def __new__(cls, *, foo):
                self = int.__new__(cls)
                self.foo = foo
                return self
            def __getnewargs_ex__(self):
                return (), {'foo': self.foo}
            def __eq__(self, other):
                return self.foo == other.foo
        x = C(foo=42)
        y = copy.copy(x)
        self.assertIsInstance(y, C)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertEqual(y.foo, x.foo)

    def test_copy_inst_getstate(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __getstate__(self):
                return {"foo": self.foo}
            def __eq__(self, other):
                return self.foo == other.foo
        x = C(42)
        self.assertEqual(copy.copy(x), x)

    def test_copy_inst_setstate(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __setstate__(self, state):
                self.foo = state["foo"]
            def __eq__(self, other):
                return self.foo == other.foo
        x = C(42)
        self.assertEqual(copy.copy(x), x)

    def test_copy_inst_getstate_setstate(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __getstate__(self):
                return self.foo
            def __setstate__(self, state):
                self.foo = state
            def __eq__(self, other):
                return self.foo == other.foo
        x = C(42)
        self.assertEqual(copy.copy(x), x)
        # State with boolean value is false (issue #25718)
        x = C(0.0)
        self.assertEqual(copy.copy(x), x)

    # The deepcopy() method

    def test_deepcopy_basic(self):
        x = 42
        y = copy.deepcopy(x)
        self.assertEqual(y, x)

    def test_deepcopy_memo(self):
        # Tests of reflexive objects are under type-specific sections below.
        # This tests only repetitions of objects.
        x = []
        x = [x, x]
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertIsNot(y[0], x[0])
        self.assertIs(y[0], y[1])

    def test_deepcopy_issubclass(self):
        # XXX Note: there's no way to test the TypeError coming out of
        # issubclass() -- this can only happen when an extension
        # module defines a "type" that doesn't formally inherit from
        # type.
        class Meta(type):
            pass
        class C(metaclass=Meta):
            pass
        self.assertEqual(copy.deepcopy(C), C)

    def test_deepcopy_deepcopy(self):
        class C(object):
            def __init__(self, foo):
                self.foo = foo
            def __deepcopy__(self, memo=None):
                return C(self.foo)
        x = C(42)
        y = copy.deepcopy(x)
        self.assertEqual(y.__class__, x.__class__)
        self.assertEqual(y.foo, x.foo)

    def test_deepcopy_registry(self):
        class C(object):
            def __new__(cls, foo):
                obj = object.__new__(cls)
                obj.foo = foo
                return obj
        def pickle_C(obj):
            return (C, (obj.foo,))
        x = C(42)
        self.assertRaises(TypeError, copy.deepcopy, x)
        copyreg.pickle(C, pickle_C, C)
        y = copy.deepcopy(x)

    def test_deepcopy_reduce_ex(self):
        class C(object):
            def __reduce_ex__(self, proto):
                c.append(1)
                return ""
            def __reduce__(self):
                self.fail("shouldn't call this")
        c = []
        x = C()
        y = copy.deepcopy(x)
        self.assertIs(y, x)
        self.assertEqual(c, [1])

    def test_deepcopy_reduce(self):
        class C(object):
            def __reduce__(self):
                c.append(1)
                return ""
        c = []
        x = C()
        y = copy.deepcopy(x)
        self.assertIs(y, x)
        self.assertEqual(c, [1])

    def test_deepcopy_cant(self):
        class C(object):
            def __getattribute__(self, name):
                if name.startswith("__reduce"):
                    raise AttributeError(name)
                return object.__getattribute__(self, name)
        x = C()
        self.assertRaises(copy.Error, copy.deepcopy, x)

    # Type-specific _deepcopy_xxx() methods

    def test_deepcopy_atomic(self):
        class Classic:
            pass
        class NewStyle(object):
            pass
        def f():
            pass
        tests = [None, 42, 2**100, 3.14, True, False, 1j,
                 "hello", "hello\u1234", f.__code__,
                 NewStyle, Classic, max]
        for x in tests:
            self.assertIs(copy.deepcopy(x), x)

    def test_deepcopy_list(self):
        x = [[1, 2], 3]
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(x, y)
        self.assertIsNot(x[0], y[0])

    def test_deepcopy_reflexive_list(self):
        x = []
        x.append(x)
        y = copy.deepcopy(x)
        for op in comparisons:
            self.assertRaises(RecursionError, op, y, x)
        self.assertIsNot(y, x)
        self.assertIs(y[0], y)
        self.assertEqual(len(y), 1)

    def test_deepcopy_empty_tuple(self):
        x = ()
        y = copy.deepcopy(x)
        self.assertIs(x, y)

    def test_deepcopy_tuple(self):
        x = ([1, 2], 3)
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(x, y)
        self.assertIsNot(x[0], y[0])

    def test_deepcopy_tuple_of_immutables(self):
        x = ((1, 2), 3)
        y = copy.deepcopy(x)
        self.assertIs(x, y)

    def test_deepcopy_reflexive_tuple(self):
        x = ([],)
        x[0].append(x)
        y = copy.deepcopy(x)
        for op in comparisons:
            self.assertRaises(RecursionError, op, y, x)
        self.assertIsNot(y, x)
        self.assertIsNot(y[0], x[0])
        self.assertIs(y[0][0], y)

    def test_deepcopy_dict(self):
        x = {"foo": [1, 2], "bar": 3}
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(x, y)
        self.assertIsNot(x["foo"], y["foo"])

    def test_deepcopy_reflexive_dict(self):
        x = {}
        x['foo'] = x
        y = copy.deepcopy(x)
        for op in order_comparisons:
            self.assertRaises(TypeError, op, y, x)
        for op in equality_comparisons:
            self.assertRaises(RecursionError, op, y, x)
        self.assertIsNot(y, x)
        self.assertIs(y['foo'], y)
        self.assertEqual(len(y), 1)

    def test_deepcopy_keepalive(self):
        memo = {}
        x = []
        y = copy.deepcopy(x, memo)
        self.assertIs(memo[id(memo)][0], x)

    def test_deepcopy_dont_memo_immutable(self):
        memo = {}
        x = [1, 2, 3, 4]
        y = copy.deepcopy(x, memo)
        self.assertEqual(y, x)
        # There's the entry for the new list, and the keep alive.
        self.assertEqual(len(memo), 2)

        memo = {}
        x = [(1, 2)]
        y = copy.deepcopy(x, memo)
        self.assertEqual(y, x)
        # Tuples with immutable contents are immutable for deepcopy.
        self.assertEqual(len(memo), 2)

    def test_deepcopy_inst_vanilla(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __eq__(self, other):
                return self.foo == other.foo
        x = C([42])
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y.foo, x.foo)

    def test_deepcopy_inst_deepcopy(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __deepcopy__(self, memo):
                return C(copy.deepcopy(self.foo, memo))
            def __eq__(self, other):
                return self.foo == other.foo
        x = C([42])
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertIsNot(y.foo, x.foo)

    def test_deepcopy_inst_getinitargs(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __getinitargs__(self):
                return (self.foo,)
            def __eq__(self, other):
                return self.foo == other.foo
        x = C([42])
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertIsNot(y.foo, x.foo)

    def test_deepcopy_inst_getnewargs(self):
        class C(int):
            def __new__(cls, foo):
                self = int.__new__(cls)
                self.foo = foo
                return self
            def __getnewargs__(self):
                return self.foo,
            def __eq__(self, other):
                return self.foo == other.foo
        x = C([42])
        y = copy.deepcopy(x)
        self.assertIsInstance(y, C)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertEqual(y.foo, x.foo)
        self.assertIsNot(y.foo, x.foo)

    def test_deepcopy_inst_getnewargs_ex(self):
        class C(int):
            def __new__(cls, *, foo):
                self = int.__new__(cls)
                self.foo = foo
                return self
            def __getnewargs_ex__(self):
                return (), {'foo': self.foo}
            def __eq__(self, other):
                return self.foo == other.foo
        x = C(foo=[42])
        y = copy.deepcopy(x)
        self.assertIsInstance(y, C)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertEqual(y.foo, x.foo)
        self.assertIsNot(y.foo, x.foo)

    def test_deepcopy_inst_getstate(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __getstate__(self):
                return {"foo": self.foo}
            def __eq__(self, other):
                return self.foo == other.foo
        x = C([42])
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertIsNot(y.foo, x.foo)

    def test_deepcopy_inst_setstate(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __setstate__(self, state):
                self.foo = state["foo"]
            def __eq__(self, other):
                return self.foo == other.foo
        x = C([42])
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertIsNot(y.foo, x.foo)

    def test_deepcopy_inst_getstate_setstate(self):
        class C:
            def __init__(self, foo):
                self.foo = foo
            def __getstate__(self):
                return self.foo
            def __setstate__(self, state):
                self.foo = state
            def __eq__(self, other):
                return self.foo == other.foo
        x = C([42])
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertIsNot(y.foo, x.foo)
        # State with boolean value is false (issue #25718)
        x = C([])
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y, x)
        self.assertIsNot(y.foo, x.foo)

    def test_deepcopy_reflexive_inst(self):
        class C:
            pass
        x = C()
        x.foo = x
        y = copy.deepcopy(x)
        self.assertIsNot(y, x)
        self.assertIs(y.foo, y)

    def test_deepcopy_range(self):
        class I(int):
            pass
        x = range(I(10))
        y = copy.deepcopy(x)
        self.assertIsNot(y, x)
        self.assertEqual(y, x)
        self.assertIsNot(y.stop, x.stop)
        self.assertEqual(y.stop, x.stop)
        self.assertIsInstance(y.stop, I)

    # _reconstruct()

    def test_reconstruct_string(self):
        class C(object):
            def __reduce__(self):
                return ""
        x = C()
        y = copy.copy(x)
        self.assertIs(y, x)
        y = copy.deepcopy(x)
        self.assertIs(y, x)

    def test_reconstruct_nostate(self):
        class C(object):
            def __reduce__(self):
                return (C, ())
        x = C()
        x.foo = 42
        y = copy.copy(x)
        self.assertIs(y.__class__, x.__class__)
        y = copy.deepcopy(x)
        self.assertIs(y.__class__, x.__class__)

    def test_reconstruct_state(self):
        class C(object):
            def __reduce__(self):
                return (C, (), self.__dict__)
            def __eq__(self, other):
                return self.__dict__ == other.__dict__
        x = C()
        x.foo = [42]
        y = copy.copy(x)
        self.assertEqual(y, x)
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y.foo, x.foo)

    def test_reconstruct_state_setstate(self):
        class C(object):
            def __reduce__(self):
                return (C, (), self.__dict__)
            def __setstate__(self, state):
                self.__dict__.update(state)
            def __eq__(self, other):
                return self.__dict__ == other.__dict__
        x = C()
        x.foo = [42]
        y = copy.copy(x)
        self.assertEqual(y, x)
        y = copy.deepcopy(x)
        self.assertEqual(y, x)
        self.assertIsNot(y.foo, x.foo)

    def test_reconstruct_reflexive(self):
        class C(object):
            pass
        x = C()
        x.foo = x
        y = copy.deepcopy(x)
        self.assertIsNot(y, x)
        self.assertIs(y.foo, y)

    # Additions for Python 2.3 and pickle protocol 2

    def test_reduce_4tuple(self):
        class C(list):
            def __reduce__(self):
                return (C, (), self.__dict__, iter(self))
            def __eq__(self, other):
                return (list(self) == list(other) and
                        self.__dict__ == other.__dict__)
        x = C([[1, 2], 3])
        y = copy.copy(x)
        self.assertEqual(x, y)
        self.assertIsNot(x, y)
        self.assertIs(x[0], y[0])
        y = copy.deepcopy(x)
        self.assertEqual(x, y)
        self.assertIsNot(x, y)
        self.assertIsNot(x[0], y[0])

    def test_reduce_5tuple(self):
        class C(dict):
            def __reduce__(self):
                return (C, (), self.__dict__, None, self.items())
            def __eq__(self, other):
                return (dict(self) == dict(other) and
                        self.__dict__ == other.__dict__)
        x = C([("foo", [1, 2]), ("bar", 3)])
        y = copy.copy(x)
        self.assertEqual(x, y)
        self.assertIsNot(x, y)
        self.assertIs(x["foo"], y["foo"])
        y = copy.deepcopy(x)
        self.assertEqual(x, y)
        self.assertIsNot(x, y)
        self.assertIsNot(x["foo"], y["foo"])

    def test_copy_slots(self):
        class C(object):
            __slots__ = ["foo"]
        x = C()
        x.foo = [42]
        y = copy.copy(x)
        self.assertIs(x.foo, y.foo)

    def test_deepcopy_slots(self):
        class C(object):
            __slots__ = ["foo"]
        x = C()
        x.foo = [42]
        y = copy.deepcopy(x)
        self.assertEqual(x.foo, y.foo)
        self.assertIsNot(x.foo, y.foo)

    def test_deepcopy_dict_subclass(self):
        class C(dict):
            def __init__(self, d=None):
                if not d:
                    d = {}
                self._keys = list(d.keys())
                super().__init__(d)
            def __setitem__(self, key, item):
                super().__setitem__(key, item)
                if key not in self._keys:
                    self._keys.append(key)
        x = C(d={'foo':0})
        y = copy.deepcopy(x)
        self.assertEqual(x, y)
        self.assertEqual(x._keys, y._keys)
        self.assertIsNot(x, y)
        x['bar'] = 1
        self.assertNotEqual(x, y)
        self.assertNotEqual(x._keys, y._keys)

    def test_copy_list_subclass(self):
        class C(list):
            pass
        x = C([[1, 2], 3])
        x.foo = [4, 5]
        y = copy.copy(x)
        self.assertEqual(list(x), list(y))
        self.assertEqual(x.foo, y.foo)
        self.assertIs(x[0], y[0])
        self.assertIs(x.foo, y.foo)

    def test_deepcopy_list_subclass(self):
        class C(list):
            pass
        x = C([[1, 2], 3])
        x.foo = [4, 5]
        y = copy.deepcopy(x)
        self.assertEqual(list(x), list(y))
        self.assertEqual(x.foo, y.foo)
        self.assertIsNot(x[0], y[0])
        self.assertIsNot(x.foo, y.foo)

    def test_copy_tuple_subclass(self):
        class C(tuple):
            pass
        x = C([1, 2, 3])
        self.assertEqual(tuple(x), (1, 2, 3))
        y = copy.copy(x)
        self.assertEqual(tuple(y), (1, 2, 3))

    def test_deepcopy_tuple_subclass(self):
        class C(tuple):
            pass
        x = C([[1, 2], 3])
        self.assertEqual(tuple(x), ([1, 2], 3))
        y = copy.deepcopy(x)
        self.assertEqual(tuple(y), ([1, 2], 3))
        self.assertIsNot(x, y)
        self.assertIsNot(x[0], y[0])

    def test_getstate_exc(self):
        class EvilState(object):
            def __getstate__(self):
                raise ValueError("ain't got no stickin' state")
        self.assertRaises(ValueError, copy.copy, EvilState())

    def test_copy_function(self):
        self.assertEqual(copy.copy(global_foo), global_foo)
        def foo(x, y): return x+y
        self.assertEqual(copy.copy(foo), foo)
        bar = lambda: None
        self.assertEqual(copy.copy(bar), bar)

    def test_deepcopy_function(self):
        self.assertEqual(copy.deepcopy(global_foo), global_foo)
        def foo(x, y): return x+y
        self.assertEqual(copy.deepcopy(foo), foo)
        bar = lambda: None
        self.assertEqual(copy.deepcopy(bar), bar)

    def _check_weakref(self, _copy):
        class C(object):
            pass
        obj = C()
        x = weakref.ref(obj)
        y = _copy(x)
        self.assertIs(y, x)
        del obj
        y = _copy(x)
        self.assertIs(y, x)

    def test_copy_weakref(self):
        self._check_weakref(copy.copy)

    def test_deepcopy_weakref(self):
        self._check_weakref(copy.deepcopy)

    def _check_copy_weakdict(self, _dicttype):
        class C(object):
            pass
        a, b, c, d = [C() for i in range(4)]
        u = _dicttype()
        u[a] = b
        u[c] = d
        v = copy.copy(u)
        self.assertIsNot(v, u)
        self.assertEqual(v, u)
        self.assertEqual(v[a], b)
        self.assertEqual(v[c], d)
        self.assertEqual(len(v), 2)
        del c, d
        self.assertEqual(len(v), 1)
        x, y = C(), C()
        # The underlying containers are decoupled
        v[x] = y
        self.assertNotIn(x, u)

    def test_copy_weakkeydict(self):
        self._check_copy_weakdict(weakref.WeakKeyDictionary)

    def test_copy_weakvaluedict(self):
        self._check_copy_weakdict(weakref.WeakValueDictionary)

    def test_deepcopy_weakkeydict(self):
        class C(object):
            def __init__(self, i):
                self.i = i
        a, b, c, d = [C(i) for i in range(4)]
        u = weakref.WeakKeyDictionary()
        u[a] = b
        u[c] = d
        # Keys aren't copied, values are
        v = copy.deepcopy(u)
        self.assertNotEqual(v, u)
        self.assertEqual(len(v), 2)
        self.assertIsNot(v[a], b)
        self.assertIsNot(v[c], d)
        self.assertEqual(v[a].i, b.i)
        self.assertEqual(v[c].i, d.i)
        del c
        self.assertEqual(len(v), 1)

    def test_deepcopy_weakvaluedict(self):
        class C(object):
            def __init__(self, i):
                self.i = i
        a, b, c, d = [C(i) for i in range(4)]
        u = weakref.WeakValueDictionary()
        u[a] = b
        u[c] = d
        # Keys are copied, values aren't
        v = copy.deepcopy(u)
        self.assertNotEqual(v, u)
        self.assertEqual(len(v), 2)
        (x, y), (z, t) = sorted(v.items(), key=lambda pair: pair[0].i)
        self.assertIsNot(x, a)
        self.assertEqual(x.i, a.i)
        self.assertIs(y, b)
        self.assertIsNot(z, c)
        self.assertEqual(z.i, c.i)
        self.assertIs(t, d)
        del x, y, z, t
        del d
        self.assertEqual(len(v), 1)

    def test_deepcopy_bound_method(self):
        class Foo(object):
            def m(self):
                pass
        f = Foo()
        f.b = f.m
        g = copy.deepcopy(f)
        self.assertEqual(g.m, g.b)
        self.assertIs(g.b.__self__, g)
        g.b()


def global_foo(x, y): return x+y

if __name__ == "__main__":
    unittest.main()