Using files as stdin and stdout for subprocess

Question

How do I replicate the following batch command using python subprocess module?

myprogram < myinput.in > myoutput.out 

In other words, how do I run myprogram using the contents of myinput.in as the standard input and myoutput.out as standard output?

Answer 1

The following should work:

myinput = open('myinput.in') myoutput = open('myoutput.out', 'w') p = subprocess.Popen('myprogram.exe', stdin=myinput, stdout=myoutput) p.wait() myoutput.flush()