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Created on 2018-01-24 10:52 by Róbert Lexmann, last changed 2022-04-11 14:58 by admin. This issue is now closed.
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| msg310584 - (view) | Author: Róbert Lexmann (Róbert Lexmann) | Date: 2018-01-24 10:52 | |
struct.pack('id',a,b) returns 16 bytes, should return 4+8=12 bytes. struct.calcsize('id') also returns 16.
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| msg310585 - (view) | Author: Christian Heimes (christian.heimes) *  |
Date: 2018-01-24 11:00 | |
It's not a bug. Please read the section about padding.
>>> struct.calcsize('id')
16
>>> struct.calcsize('>id')
12
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| msg310589 - (view) | Author: Róbert Lexmann (Róbert Lexmann) | Date: 2018-01-24 13:04 | |
Thanks for a fast response. If I may ask, what is it good for to encode 'id' in 16 bytes and 'di' in 12? Rob On 01/24/2018 12:00 PM, Christian Heimes wrote: > Christian Heimes <lists@cheimes.de> added the comment: > > It's not a bug. Please read the section about padding. > >>>> struct.calcsize('id') > 16 >>>> struct.calcsize('>id') > 12 > > ---------- > nosy: +christian.heimes > resolution: -> not a bug > stage: -> resolved > status: open -> closed > > _______________________________________ > Python tracker <report@bugs.python.org> > <https://bugs.python.org/issue32648> > _______________________________________ |
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| msg310590 - (view) | Author: Christian Heimes (christian.heimes) * |
Date: 2018-01-24 13:18 | |
Hardware restrictions, some CPUs require types to be aligned in certain ways. Doubles must be aligned by multiple of 8 bytes. Please read https://en.wikipedia.org/wiki/Data_structure_alignment and use the Python users mailing list for further questions. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:57 | admin | set | github: 76829 |
| 2018-01-24 13:18:46 | christian.heimes | set | messages: + msg310590 |
| 2018-01-24 13:04:15 | Róbert Lexmann | set | messages: + msg310589 |
| 2018-01-24 11:00:51 | christian.heimes | set | status: open -> closed nosy: + christian.heimes messages: + msg310585 resolution: not a bug stage: resolved |
| 2018-01-24 10:52:36 | Róbert Lexmann | create | |