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Created on 2010-02-25 18:22 by codingrobot, last changed 2022-04-11 14:56 by admin. This issue is now closed.
| Files | ||||
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| File name | Uploaded | Description | Edit | |
| struct_test.py | codingrobot, 2010-02-25 18:49 | simple test | ||
| Messages (4) | |||
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| msg100096 - (view) | Author: Nick (codingrobot) | Date: 2010-02-25 18:22 | |
the code I'm trying to execute (block is long enough):
unpack("2IB2I", block)
executing this raises an exception:
struct.error: unpack requires a bytes argument of length 20
Setting native byte-order with '@' causes the same error.
Specifying the correct byte-order either with '>' or '<', or
native with '=' helps and unpack expects the correct number (17) of bytes.
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| msg100097 - (view) | Author: Brian Curtin (brian.curtin) *  |
Date: 2010-02-25 18:26 | |
Can you provide a complete test case or example? |
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| msg100098 - (view) | Author: Nick (codingrobot) | Date: 2010-02-25 18:49 | |
tested on macosx 10.6.2 64-bit and debian amd64 with both python2.6 and python3.1 the output is always the same: b'\x01\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00' 20 (1, 1, 2, 1, 1) (1, 1, 2, 16777216, 16777216) (1, 1, 2, 16777216, 16777216) ------------------ b'\x01\x00\x00\x00\x01\x00\x00\x00\x02\x01\x00\x00\x00\x01\x00\x00\x00' 17 (1, 1, 2, 1, 1) (1, 1, 2, 1, 1) |
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| msg100101 - (view) | Author: Amaury Forgeot d'Arc (amaury.forgeotdarc) * |
Date: 2010-02-25 20:21 | |
It's not about byte ordering. '@' and '=' also change the alignment! The documentation says it well: - '@' (or no marker) uses the 'native' alignment, which (on every platform I know) aligns 4-bytes ints to multiple of 4 bytes. - '=' uses the 'standard' alignment which is: "no alignment is required for any type" |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:56:58 | admin | set | github: 52267 |
| 2010-02-25 20:21:50 | amaury.forgeotdarc | set | status: open -> closed nosy: + amaury.forgeotdarc messages: + msg100101 resolution: not a bug |
| 2010-02-25 18:49:15 | codingrobot | set | files:
+ struct_test.py messages: + msg100098 |
| 2010-02-25 18:26:17 | brian.curtin | set | nosy:
+ brian.curtin messages: + msg100097 stage: test needed |
| 2010-02-25 18:22:28 | codingrobot | create | |