stw <sil...@googlemail.com> added the comment:
Thanks for the nod to the pickletools module. The structure of the streams do
change between python 2.6 and 2.7, at least for files created with cPickle. You
can see this from the file sizes that I quoted in my previous post. Below are
some snippets of the disassemblies of pickle files generated using make_file.py:
pickle, python 2.6 and 2.7:
0: \x80 PROTO 2
2: } EMPTY_DICT
3: q BINPUT 0
5: ( MARK
6: U SHORT_BINSTRING 'ArLLX'
13: q BINPUT 1
15: \x85 TUPLE1
16: q BINPUT 2
18: K BININT1 0
...
cPickle, python 2.6:
0: \x80 PROTO 2
2: } EMPTY_DICT
3: q BINPUT 1
5: ( MARK
6: U SHORT_BINSTRING 'XYoGB'
13: \x85 TUPLE1
14: q BINPUT 2
16: K BININT1 0
...
cPickle, python 2.7:
0: \x80 PROTO 2
2: } EMPTY_DICT
3: q BINPUT 1
5: ( MARK
6: U SHORT_BINSTRING 'QGgRa'
13: \x85 TUPLE1
14: K BININT1 1
...
As you can see, pickle memoizes both the string and the tuple. cPickle2.6 just
memoizes the tuple, while cPickle2.7 doesn't memoize either. It therefore seems
that the problem is somehow related to the memo...
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<http://bugs.python.org/issue14775>
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