import os, subprocess xys = [[1,2],[3,4]] msg = '\n'.join([str(x) + ',' + str(y) for x, y in xys]) os.popen('command', 'w').write(msg) os.popen2('command')[0].write(msg)
p = subprocess.Popen('command', stdin=subprocess.PIPE) p.stdin.write(msg) help(subprocess) help(os.popen) help(os.popen3) Chris Hieronymus wrote: > Hi, > > I have a bunch of x-y data contained in an array. I would like to > plot the data using an > external program (psxy in GMT). The plotting program takes x-y > couples as standard > input. How do I get the data into the system call? I used to do > things in csh and awk, > i.e., something like > > awk '{<some manipulations here>; print $1, $2}' filename | psxy <some > options> >! output.ps > > The reason I'm trying to use python is because the manipulations are > getting too cumbersome > in awk. Now I have all the manipulations done in python, but I'm > missing that last step. > > I've tried various things with os.system, popen, and subprocess, but > so far without success. > Does anyone know how to do this? > > chris > > > ------------------------------------------------------------------------ > ------------------------------------------- > Christoph > Hieronymus > [EMAIL PROTECTED] > Associate > Professor > phone: (+46) 18-471 2383 > Uppsala > University > fax: (+46) 18-501 110 > Dept. of Earth Sciences (Geophysics) > Villavägen 16 > SE-752 36 Uppsala, Sweden -- http://mail.python.org/mailman/listinfo/python-list