New submission from Serhiy Storchaka <storchaka+cpyt...@gmail.com>:
test_clear_pickler_memo tested only the default protocol and fails when bump
the default protocol to 4. For some reasons C implementation writes FRAME
before PROTO when call Pickler.dump() repeatedly.
Python implementation:
b'\x80\x04\x95\x13\x00\x00\x00\x00\x00\x00\x00]\x94(\x8c\x07abcdefg\x94h\x01K,e.'
0: \x80 PROTO 4
2: \x95 FRAME 19
11: ] EMPTY_LIST
12: \x94 MEMOIZE (as 0)
13: ( MARK
14: \x8c SHORT_BINUNICODE 'abcdefg'
23: \x94 MEMOIZE (as 1)
24: h BINGET 1
26: K BININT1 44
28: e APPENDS (MARK at 13)
29: . STOP
highest protocol among opcodes = 4
C implementation:
b'\x95\x15\x00\x00\x00\x00\x00\x00\x00\x80\x04]\x94(\x8c\x07abcdefg\x94h\x01K,e.'
0: \x95 FRAME 21
9: \x80 PROTO 4
11: ] EMPTY_LIST
12: \x94 MEMOIZE (as 0)
13: ( MARK
14: \x8c SHORT_BINUNICODE 'abcdefg'
23: \x94 MEMOIZE (as 1)
24: h BINGET 1
26: K BININT1 44
28: e APPENDS (MARK at 13)
29: . STOP
highest protocol among opcodes = 4
----------
components: Extension Modules
messages: 314847
nosy: alexandre.vassalotti, pitrou, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Repeated Pickler.dump() doesn't reset the state in the C implementation
of pickle
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33209>
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