Originally Posted by caco3

Hi all

I am looking to speed up some very time consuming math functions used in python.
Basically I have to run a math function 1000 of time:

Code:

a=a+b*c

In python it takes several seconds to perform on my N900.

Now I had a look on ShedSkin as mentioned above.
(BTW: There got recently a new version released, 0.6)

I can generate a module on my Ubuntu PC and it works well (havent tested the speed). But how do I get it working on Maemo?
C usually has to be compile for a specific architecture, how is it on ShedSkin? How do I compile it for our ARM?

If I used the library compiled on the PC and import it in python on my N900, I get this error:

Code:

>>> from simple_module import func1, func2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: ./simple_module.so: cannot open shared object file: No such file or directory

Even I am in the correct directory:

Code:

> ls -l
-rw-r--r--    1 root     root         1023 Nov 17 06:45 Makefile
-rw-r--r--    1 root     root         2855 Nov 17 06:45 simple_module.cpp
-rw-r--r--    1 root     root          441 Nov 17 06:45 simple_module.hpp
-rw-r--r--    1 root     root          188 Nov 17 06:45 simple_module.py
-rwxr-xr-x    1 root     root      1491856 Nov 17 06:46 simple_module.so

I use the example from http://code.google.com/p/shedskin/do...orial-0.6.html

Or do you know a better way of speeding up basic python code?

Thank you for your help

Originally Posted by caco3

Thank you, this makes actually sense
I am now going to install the SDK.

Some question I have:
Is it ok to put the created library *.so into the same folder of my python application (/opt/Appname/) or should it go to /usr/libs/?
And do I also just include it into my tar.gz file I upload to maemo.org for packaging?

Originally Posted by caco3

Thank you for your quick help.
I installed the SDK and could run it, also Yephyr works.
I made the hello example in http://wiki.maemo.org/Packaging and it works.
But now I do not know how I have to continue to build a c library for python instead a stand alone application.
I tried to install (compile) Shedskin, but it fails as I have not enough rights. even when I do it as fakreroot, it tells me that I have not enough rights:
[CODE]
[sbox-FREMANTLE_X86: ~/MyDocs/shedskin-0.6] > fakeroot
sh-2.05b#
sh-2.05b# cd MyDocs/shedskin-0.6/
sh-2.05b# python setup.py install
/scratchbox/tools/lib/python2.3/distutils/dist.py:227: UserWarning: Unknown distribution option: 'package_data'
warnings.warn(msg)
running install
running build
running build_py
running build_scripts
running install_lib
creating /scratchbox/tools/lib/python2.3/site-packages/shedskin
error: could not create '/scratchbox/tools/lib/python2.3/site-packages/shedskin': Permission denied

sh-2.05b# whoami
root
[/CODE

I guess there is also a (better) way than using shedskin, but I am confused with all the information I find in the internet.

Originally Posted by caco3

Ok, I was now able to install shedskin on my SDK. I had to chmod some directories with my main root account. fakeroot in scratchbox was not able to do it.

Shedskin now got successful installed, but when I want to use it, I get this error:

Code:

sh-2.05b# shedskin test
Traceback (most recent call last):
  File "/scratchbox/tools/bin/shedskin", line 2, in ?
    import shedskin
  File "/scratchbox/tools/lib/python2.3/site-packages/shedskin/__init__.py", line 10, in ?
    import infer, cpp, annotate
  File "/scratchbox/tools/lib/python2.3/site-packages/shedskin/infer.py", line 39, in ?
    from shared import *
  File "/scratchbox/tools/lib/python2.3/site-packages/shedskin/shared.py", line 524, in ?
    errormsgs = set()
NameError: name 'set' is not defined

It seems that python2.3 is used, but it does not support the "set" command.
How do I upgrade the python version? I am a bit surprised that it is still 2.3.

@epage: Do you know how I could make a python module with c directly? I do not really care with which tools I have to do it, it just has to work.