Serhiy Storchaka added the comment:
Here is a minimal reproducer. Results:
pickle.dumps('spam', 2)
0: \x80 PROTO 2
2: U SHORT_BINSTRING 'spam'
8: q BINPUT 0
10: . STOP
highest protocol among opcodes = 2
pickle.dumps('spam1'[:-1], 2)
0: \x80 PROTO 2
2: U SHORT_BINSTRING 'spam'
8: q BINPUT 0
10: . STOP
highest protocol among opcodes = 2
cPickle.dumps('spam', 2)
0: \x80 PROTO 2
2: U SHORT_BINSTRING 'spam'
8: q BINPUT 1
10: . STOP
highest protocol among opcodes = 2
cPickle.dumps('spam1'[:-1], 2)
0: \x80 PROTO 2
2: U SHORT_BINSTRING 'spam'
8: . STOP
highest protocol among opcodes = 2
The difference between 3rd and 4th examples is "BINPUT 1". In the last case the
string has refcount=1 and BINPUT doesn't emitted due to optimization. Note that
Python implementation emits BINPUT with different number.
----------
Added file: http://bugs.python.org/file29108/cPickletest2.py
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12596>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
