Created on 2011-08-12 16:26 by pitrou, last changed 2011-08-13 21:50 by rhettinger. This issue is now closed.
| Messages (3) | |||
|---|---|---|---|
| msg141971 - (view) | Author: Antoine Pitrou (pitrou) *  |
Date: 2011-08-12 16:26 | |
On a 64-bit Linux machine (where C `long` is 64 bits):
>>> len(pickle.dumps(2**30))
8
>>> len(pickle.dumps(2**31))
16
>>> len(pickle.dumps(2**62))
25
>>> len(pickle.dumps(2**63))
14
This is because the old text protocol is used when the integer can fit in a C long but not in 4 bytes:
>>> pickletools.dis(pickle.dumps(2**62))
0: \x80 PROTO 3
2: L LONG 4611686018427387904
24: . STOP
highest protocol among opcodes = 2
>>> pickletools.dis(pickle.dumps(2**63))
0: \x80 PROTO 3
2: \x8a LONG1 9223372036854775808
13: . STOP
highest protocol among opcodes = 2
|
|||
| msg142032 - (view) | Author: Roundup Robot (python-dev) | Date: 2011-08-13 18:19 | |
New changeset 8e824e09924a by Antoine Pitrou in branch 'default': Issue #12744: Fix inefficient representation of integers http://hg.python.org/cpython/rev/8e824e09924a |
|||
| msg142040 - (view) | Author: Raymond Hettinger (rhettinger) * |
Date: 2011-08-13 21:50 | |
Nice. |
|||
| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2011-08-13 21:50:57 | rhettinger | set | nosy:
+ rhettinger messages: + msg142040 |
| 2011-08-13 18:19:54 | pitrou | set | status: open -> closed resolution: fixed stage: needs patch -> resolved |
| 2011-08-13 18:19:40 | python-dev | set | nosy:
+ python-dev messages: + msg142032 |
| 2011-08-13 16:41:58 | pitrou | set | nosy:
+ alexandre.vassalotti |
| 2011-08-12 16:39:08 | meador.inge | set | stage: needs patch |
| 2011-08-12 16:28:48 | meador.inge | set | nosy:
+ meador.inge |
| 2011-08-12 16:26:23 | pitrou | create | |