sbt <[email protected]> added the comment:
> I don't really know that much about pickle, but Antoine mentioned that
> 'bytearray'
> works fine going from 3.2 to 2.7. Given that, can't we just compose 'bytes'
> with
> 'bytearray'?
Yes, although it would only work for 2.6 and 2.7.
codecs.encode() seems to be available back to 2.4 and codecs.latin_1_encode()
back to at least 2.0. They also produce more compact pickles, particularly
codecs.latin_1_encode().
>>> class Bytes(bytes):
... def __reduce__(self):
... return latin_1_encode, (latin_1_decode(self),)
...
[70922 refs]
>>> pickletools.dis(pickle.dumps(Bytes(b'abc'), 2))
0: \x80 PROTO 2
2: c GLOBAL '_codecs latin_1_encode'
26: q BINPUT 0
28: X BINUNICODE 'abc'
36: q BINPUT 1
38: K BININT1 3
40: \x86 TUPLE2
41: q BINPUT 2
43: \x85 TUPLE1
44: q BINPUT 3
46: R REDUCE
47: q BINPUT 4
49: . STOP
highest protocol among opcodes = 2
Only worry is that codecs.latin_1_encode.__module__ is '_codecs', and _codecs
is undocumented.
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<http://bugs.python.org/issue13505>
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