Controlling gnuplot via subprocess.Popen

James Stroud jstroud at
Wed Apr 25 23:27:06 CEST 2007

Peter Beattie wrote:
> I am trying to plot something in gnuplot 4.2 using co-ordinates a Python
> 2.5 program computes. Here's what I'm doing:
> py> from subprocess import *
> py> plot = Popen("c:/progs/gp/bin/wgnuplot.exe", stdin=PIPE)
> py> plot.stdin.write("plot x*x")
> The first command dutifully opens gnuplot, but the second doesn't do
> anything. Could someone favour me with an explanation as to the whyness?

Why re-invent the wheel? Not trying to be pedantic, but usually the 
google search

      "python %s" % thing_im_working_on

will yield lucrative results that far exceed anything you can create in 
a reasonable amount of time. For example, "python gnuplot" first hit is:

And speaking from experience, it works beautifully.


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