[Python-talk] struct pack

[bruce.labitt at autoliv.com]

Is there a way to use struct.pack on an array? or a list?

# CME
from struct import pack, unpack
from numpy import array, random

anum = random.normal(0., 0.1, 10)       # make array of 10 random numbers
fmt = '!'+str(anum.size)+'d'            # code as 10 doubles, network 
order

apackt = pack( fmt, anum )              # <== pseudo-code, but that is my 
intent...
apack = array(apackt)                   # convert returned tuple to an 
array


One gets the error, "error: pack requires exactly 10 arguments"

Is there a way to do this besides processing each element and 
concatenating all the resultant strings?  I would imagine this to be quite 
slow for 308 x 32K byte strings = 1 FFT

I did not understand the Section 8.3.1 Struct Objects. 
http://docs.python.org/library/struct.html

Can someone provide a simple example (somewhat like above) that uses 
struct objects?

Supposedly using struct objects is faster.  If I have to process every 
element, it could be useful.

Thanks!
Bruce

Bruce Labitt
Autoliv Electronics
1011B Pawtucket Blvd, PO Box 1858
Lowell, MA  01853

Email: bruce.labitt at autoliv.com. 
Tel:  (978) 674-6526
Fax: (978) 674-6581 

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