Nov-29-2019, 08:44 AM
Hi everyone
this is Pedro and this is my first post. I am trying to write a script to make graphs with xmgrace (graphics program) under linux. There are serveral modules available on the net but none of them work with python 3.
In general terms what I want to do is to launch a process that receives input through a descriptor, in my case the command is 'xmgrace -dpipe <descriptor>'. I wrote the code below that works fine in python 2 but does nothing in python 3.
Any ideas of what's wrong?
Thank you in advance
this is Pedro and this is my first post. I am trying to write a script to make graphs with xmgrace (graphics program) under linux. There are serveral modules available on the net but none of them work with python 3.
In general terms what I want to do is to launch a process that receives input through a descriptor, in my case the command is 'xmgrace -dpipe <descriptor>'. I wrote the code below that works fine in python 2 but does nothing in python 3.
Any ideas of what's wrong?
Thank you in advance
import os
cmd=('xmgrace','-noask','-dpipe',)
fr,fw=os.pipe()
cmd=cmd+(repr(fr),)
pid=os.fork()
if pid==0:
for i in range(64):
if i not in (fr,0,1,2):
try:
os.close(i)
except OSError:
pass
os.execvp('xmgrace',cmd)
else:
os.close(fr)
pipe=os.fdopen(fw,'w',1)
pipe.write('title "test"\n')
pipe.flush()