Hi,
this snippet is causing troubles:
---
import struct
import numpy
a=numpy.arange(10).astype('H')
b=struct.pack("<10H",*a)
---
(The module struct simply packs and unpacks data in byte-blobs).
It works OK with python2.4, but gives problems with python2.5.
On my laptop (linux x86_64 on intel core 2 duo) I got this warning:
---
a.py:5: DeprecationWarning: struct integer overflow masking is deprecated
b=struct.pack("<10H",*a)
---
On another workstation (linux i686 on intel core 2, so a 32 bit OS on 64 bit
architecture) I got warning plus an _error_, when using python2.5 (python2.4
works flawlessly):
---
a.py:5: DeprecationWarning: struct integer overflow masking is deprecated
b=struct.pack("<10H",*a)
Traceback (most recent call last):
File "a.py", line 5, in <module>
b=struct.pack("<10H",*a)
File "/usr/lib/python2.5/struct.py", line 63, in pack
return o.pack(*args)
SystemError: ../Objects/longobject.c:322: bad argument to internal function
---
Both computers are ubuntu gutsy 7.10, updated.
Details:
python, 2.5.1-1ubuntu2
numpy, 1:1.0.3-1ubuntu2
Same versions on both machines.
I did some little test _without_ numpy and the struct module seems not
having
problems. Is this a numpy bug?
Note: If you remove "<" from the struct format string then it seems to work
ok.
Regards,
Emanuele
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