I'm trying to use Python to automate a process that involves calling a Fortran executable and submitting some user inputs. I've spent a few hours reading through similar questions and trying different things, but haven't had any luck. Here is a minimal example to show what I tried last
#!/usr/bin/python
import subprocess
# Calling executable
ps = subprocess.Popen('fortranExecutable',shell=True,stdin=subprocess.PIPE)
ps.communicate('argument 1')
ps.communicate('argument 2')
However, when I try to run this, I get the following error:
File "gridGen.py", line 216, in <module>
ps.communicate(outputName)
File "/opt/apps/python/epd/7.2.2/lib/python2.7/subprocess.py", line 737, in communicate
self.stdin.write(input)
ValueError: I/O operation on closed file
Any suggestions or pointers are greatly appreciated.
EDIT:
When I call the Fortran executable, it asks for user input as follows:
fortranExecutable
Enter name of input file: 'this is where I want to put argument 1'
Enter name of output file: 'this is where I want to put argument 2'
Somehow, I need to run the executable, wait until it asks for user input and then supply that input.