[Gnuplot-info] strange behavior on calling gnuplot from cgi script written in python

[Steve C. <sc...@ja...>]

Am trying to use gnuplot as a subprocess to a CGI script written in
python (similar to the perl script on p. 241 of "Gnuplot in Action").

The python script itself follows the pattern of the python script on
p.230-231, that is

gp = os.popen( ' /usr/bin/gnuplot', 'w')
... plotting commands
gp.close()

The cgi script produces a 500 error.

But, if I comment out the gp.close() command, it works perfectly, and
produces the graph I want.  What is going on here?