Installing Lightweight Python
I'd like to install python on an embedded system. It's a powerful x86- based computer with the only limitation of having a small-size flash ROM as its secondary storage. So there is no hard drive and the system is booted from the flash memory. The operating system, BusyBox (a flavor of Linux), and other applications occupy most of the flash memory. As the subject implies, Python isn't already installed on the box. I tried to compile/install python on a Linux box which roughly took 60MB of the memory. The maximum amount of Flash memory I'm permitted to use is about 10-20 MB. Is there a light-weight implementation of python which I could use? Is there a way to remove unnecessary modules? BTW, + I'm supposed to write a web management interface for this system (using python). + I know how to use Google! + I'm a newbie, so please be gentle :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing Lightweight Python
Well, I tried to run Python with -v option. It seems that python26.zip is partially loaded but can't be used, because zlib is "unavailable". n...@nima-desktop:~/py$ ./bin/*python -v* Could not find platform independent libraries Could not find platform dependent libraries Consider setting $PYTHONHOME to [:] # installing zipimport hook import zipimport # builtin # installed zipimport hook *# zipimport: found 2509 names in /home/nima/py/lib/python26.zip* # zipimport: *zlib UNAVAILABLE* 'import site' failed; traceback: *zipimport.ZipImportError: can't decompress data; zlib not available # zipimport: zlib UNAVAILABLE* Python 2.6.5 (r265:79063, May 17 2010, 18:36:54) [GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> sys.path ['', '/home/nima/py/lib/python26.zip', '/home/nima/py/lib/python2.6/', '/home/nima/py/lib/python2.6/plat-linux2', '/home/nima/py/lib/python2.6/lib-tk', '/home/nima/py/lib/python2.6/lib-old', '/home/nima/py/lib/lib-dynload'] -- *Yours sincerely, Nima Mohammadi* -- http://mail.python.org/mailman/listinfo/python-list
Drawing Multigraphs
Hi there, Is it possible to draw an (undirected) multigraph using a python library? I need to write a program that finds an Eulerian circuit in a graph (which might obviously be a multigraph). As the output of the program, I should draw the graph and print out the solution. I asked my question at NetworkX discussion group. They told me that matplotlib, which provides drawing routines for NetworkX, doesn't show multiple edges and I have to pass the graph to another graph drawing package (if there is one!). * I've used the Fleury's algorithm to solve the problem. -- Yours sincerely, Nima Mohammadi -- http://mail.python.org/mailman/listinfo/python-list
Re: Drawing Multigraphs
2010/6/1 geremy condra > > We use Dot in Graphine, and it works well. It's also very easy to > output to. > Graphine is a flexible, easy-to-use graph library for Python 3. I always knew a day would come when I'd need to use Python 3. And I've been so stupid thinking I could run away from this everlasting misery! Can you give me an example of drawing a simple graph by Graphine? I'm gonna use PyQt as GUI. Doesn't Qt provide any facility for drawing a graph? BTW, I just found this page: http://nodebox.net/code/index.php/Graphing Has anyone tried it out? -- Yours sincerely, Nima Mohammadi -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing Lightweight Python
Thanks Geremy :) The majority of installed files (56MB of data) reside in /lib/ python2.6/. So far, I took these steps to make it as compact as possible: 1. I deleted /lib/python2.6/test directory. This reduced the size by 20MB. 2. I deleted .py files (cause the corresponding pyc ones are there). This reduced the size by 9MB. 3. I deleted the /lib/libpython2.6.a which was 6MB. * By far the python runs flawlessly. 4. I zip up the /lib/python2.6/ as python26.zip and place it in the / lib/ directory. Then I delete the /lib/python2.6/ directory. By running python, I get this output, though /lib/python26.zip is in the sys.path variable. n...@nima-desktop:~/py$ ./bin/python Could not find platform independent libraries Could not find platform dependent libraries Consider setting $PYTHONHOME to [:] 'import site' failed; use -v for traceback Python 2.6.5 (r265:79063, May 17 2010, 18:36:54) [GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> sys.path ['', '/home/nima/py/lib/python26.zip', '/home/nima/py/lib/python2.6/', '/home/nima/py/lib/python2.6/plat-linux2', '/home/nima/py/lib/ python2.6/lib-tk', '/home/nima/py/lib/python2.6/lib-old', '/home/nima/ py/lib/lib-dynload'] On May 17, 9:00 pm, geremy condra wrote: > I'm not an expert, but there are probably a large-ish number of modules > you could remove without much sacrifice on your part. Looking at the > module list and just picking the platform-dependent ones: > > * _winreg > * aepack > * aetools > * aetypes > * AL > * al > * applesingle > * autoGIL > * buildtools > * Carbon > * cd > * cfmfile > * chunk > * colorpicker > * etc > * etc > * etc > > You could also probably remove things like 2to3, tabnanny, etc, > and I doubt tkinter is doing you much good. > > I also recall someone at pycon talking about importing modules > from a .zip archive. I'm not sure how easy/hard that is, but you > may want to look at PEP 302. > > Geremy Condra Yours sincerely, Nima Mohammadi -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing Lightweight Python
Well, I tried to run Python with -v option. It seems that python26.zip is partially loaded but can't be used, because zlib is "unavailable". n...@nima-desktop:~/py$ ./bin/python -v Could not find platform independent libraries Could not find platform dependent libraries Consider setting $PYTHONHOME to [:] # installing zipimport hook import zipimport # builtin # installed zipimport hook # zipimport: found 2509 names in /home/nima/py/lib/python26.zip # zipimport: zlib UNAVAILABLE 'import site' failed; traceback: zipimport.ZipImportError: can't decompress data; zlib not available # zipimport: zlib UNAVAILABLE Python 2.6.5 (r265:79063, May 17 2010, 18:36:54) [GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> sys.path ['', '/home/nima/py/lib/python26.zip', '/home/nima/py/lib/python2.6/', '/home/nima/py/lib/python2.6/plat-linux2', '/home/nima/py/lib/ python2.6/lib-tk', '/home/nima/py/lib/python2.6/lib-old', '/home/nima/ py/lib/lib-dynload'] -- Yours sincerely, Nima Mohammadi -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing Lightweight Python
On May 18, 12:30 am, geremy condra wrote: > On Mon, May 17, 2010 at 1:05 PM, Nima wrote: > > Well, I tried to run Python with -v option. It seems that python26.zip is > > partially loaded but can't be used, because zlib is "unavailable". > > is the zlib module among the files you've compressed? > > Geremy Condra zlib.so is a shared library which is in the /lib/python2.6/lib- dynload/ directory. In PEP 273 is noted that: > Any files may be present in the zip archive, but only files > *.py and *.py[co] are available for import. Zip import of > dynamic modules (*.pyd, *.so) is disallowed. http://www.python.org/dev/peps/pep-0273/ -- Yours sincerely, Nima Mohammadi -- http://mail.python.org/mailman/listinfo/python-list
Re: Installing Lightweight Python
On May 18, 1:04 am, Nima Mohammadi wrote: > On May 18, 12:30 am, geremy condra wrote: > > > On Mon, May 17, 2010 at 1:05 PM, Nima wrote: > > > Well, I tried to run Python with -v option. It seems that python26.zip is > > > partially loaded but can't be used, because zlib is "unavailable". > > > is the zlib module among the files you've compressed? > > > Geremy Condra > > zlib.so is a shared library which is in the /lib/python2.6/lib- > dynload/ directory. > In PEP 273 is noted that: > > > Any files may be present in the zip archive, but only files > > *.py and *.py[co] are available for import. Zip import of > > dynamic modules (*.pyd, *.so) is disallowed. > > http://www.python.org/dev/peps/pep-0273/ > > -- > Yours sincerely, > Nima Mohammadi The problem is solved! I just needed to make a directory named "python2.6" in the /lib/ directory and copy the lib-dynload/ directory in it. Thanks for your precious help, Geremy :) Does anyone have the list of essentials modules to run python? -- http://mail.python.org/mailman/listinfo/python-list
