Classes fail to pickle in Python 3 when super is referenced when dumping session #300
Description
This is a problematic scenario on Python 3 (tested to be failing with Python 3.5 and 3.6). The following code dumps the main session:
import dill
class A(object):
pass
class B(A):
def __init__(self):
super(B, self).__init__()
dill.dump_session('test4.dump')When this is loaded, it causes an error:
root@c3690280664a:/# python -c 'import dill; dill.load_session("test4.dump")'
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/local/lib/python3.6/site-packages/dill/_dill.py", line 410, in load_session
module = unpickler.load()
File "/usr/local/lib/python3.6/site-packages/dill/_dill.py", line 474, in find_class
return StockUnpickler.find_class(self, module, name)
AttributeError: Can't get attribute 'B' on <module '__main__' (built-in)>
For reference, this is the disassembled pickle output:
root@c3690280664a:/# python -c 'import pickletools; pickletools.dis(open("test4.dump", "rb").read())'
0: \x80 PROTO 3
2: c GLOBAL 'dill._dill _import_module'
29: q BINPUT 0
31: X BINUNICODE '__main__'
44: q BINPUT 1
46: \x85 TUPLE1
47: q BINPUT 2
49: R REDUCE
50: q BINPUT 3
52: } EMPTY_DICT
53: q BINPUT 4
55: ( MARK
56: X BINUNICODE '__name__'
69: q BINPUT 5
71: h BINGET 1
73: X BINUNICODE '__doc__'
85: q BINPUT 6
87: N NONE
88: X BINUNICODE '__package__'
104: q BINPUT 7
106: N NONE
107: X BINUNICODE '__spec__'
120: q BINPUT 8
122: N NONE
123: X BINUNICODE '__annotations__'
143: q BINPUT 9
145: } EMPTY_DICT
146: q BINPUT 10
148: X BINUNICODE '__file__'
161: q BINPUT 11
163: X BINUNICODE '1.py'
172: q BINPUT 12
174: X BINUNICODE '__cached__'
189: q BINPUT 13
191: N NONE
192: X BINUNICODE 'dill'
201: q BINPUT 14
203: h BINGET 0
205: h BINGET 14
207: \x85 TUPLE1
208: q BINPUT 15
210: R REDUCE
211: q BINPUT 16
213: X BINUNICODE 'A'
219: q BINPUT 17
221: c GLOBAL 'dill._dill _create_type'
246: q BINPUT 18
248: ( MARK
249: c GLOBAL 'dill._dill _load_type'
272: q BINPUT 19
274: X BINUNICODE 'type'
283: q BINPUT 20
285: \x85 TUPLE1
286: q BINPUT 21
288: R REDUCE
289: q BINPUT 22
291: h BINGET 17
293: h BINGET 19
295: X BINUNICODE 'object'
306: q BINPUT 23
308: \x85 TUPLE1
309: q BINPUT 24
311: R REDUCE
312: q BINPUT 25
314: \x85 TUPLE1
315: q BINPUT 26
317: } EMPTY_DICT
318: q BINPUT 27
320: ( MARK
321: X BINUNICODE '__module__'
336: q BINPUT 28
338: h BINGET 1
340: h BINGET 6
342: N NONE
343: u SETITEMS (MARK at 320)
344: t TUPLE (MARK at 248)
345: q BINPUT 29
347: R REDUCE
348: q BINPUT 30
350: X BINUNICODE 'B'
356: q BINPUT 31
358: h BINGET 18
360: ( MARK
361: h BINGET 22
363: h BINGET 31
365: h BINGET 30
367: \x85 TUPLE1
368: q BINPUT 32
370: } EMPTY_DICT
371: q BINPUT 33
373: ( MARK
374: h BINGET 28
376: h BINGET 1
378: X BINUNICODE '__init__'
391: q BINPUT 34
393: c GLOBAL 'dill._dill _create_function'
422: q BINPUT 35
424: ( MARK
425: h BINGET 19
427: X BINUNICODE 'CodeType'
440: q BINPUT 36
442: \x85 TUPLE1
443: q BINPUT 37
445: R REDUCE
446: q BINPUT 38
448: ( MARK
449: K BININT1 1
451: K BININT1 0
453: K BININT1 1
455: K BININT1 3
457: K BININT1 3
459: C SHORT_BINBYTES b't\x00t\x01|\x00\x83\x02j\x02\x83\x00\x01\x00d\x00S\x00'
479: q BINPUT 39
481: N NONE
482: \x85 TUPLE1
483: q BINPUT 40
485: X BINUNICODE 'super'
495: q BINPUT 41
497: h BINGET 31
499: h BINGET 34
501: \x87 TUPLE3
502: q BINPUT 42
504: X BINUNICODE 'self'
513: q BINPUT 43
515: \x85 TUPLE1
516: q BINPUT 44
518: X BINUNICODE '1.py'
527: q BINPUT 45
529: h BINGET 34
531: K BININT1 6
533: C SHORT_BINBYTES b'\x00\x01'
537: q BINPUT 46
539: X BINUNICODE '__class__'
553: q BINPUT 47
555: \x85 TUPLE1
556: q BINPUT 48
558: ) EMPTY_TUPLE
559: t TUPLE (MARK at 448)
560: q BINPUT 49
562: R REDUCE
563: q BINPUT 50
565: c GLOBAL '__builtin__ __main__'
587: h BINGET 34
589: N NONE
590: c GLOBAL 'dill._dill _create_cell'
615: q BINPUT 51
617: c GLOBAL '__main__ B'
629: q BINPUT 52
631: \x85 TUPLE1
632: q BINPUT 53
634: R REDUCE
635: q BINPUT 54
637: \x85 TUPLE1
638: q BINPUT 55
640: } EMPTY_DICT
641: q BINPUT 56
643: t TUPLE (MARK at 424)
644: q BINPUT 57
646: R REDUCE
647: q BINPUT 58
649: h BINGET 6
651: N NONE
652: u SETITEMS (MARK at 373)
653: t TUPLE (MARK at 360)
654: q BINPUT 59
656: R REDUCE
657: 0 POP
658: h BINGET 52
660: u SETITEMS (MARK at 55)
661: b BUILD
662: . STOP
highest protocol among opcodes = 3
CC: @aaltay, @tvalentyn, @markflyhigh