Program getting stuck when using subprocess.Popen() or subprocess.check_call()

Question

I want to run a program from python and find its memory usage. To do so I am using:

l=[\'./a.out\',\'<\',\'in.txt\',\'>\',\'out.txt\']
p=subprocess.Popen(l         


        

Answer 1

You are using shell redirection characters in your call, but when you use subprocess, and set shell=False, you have to handle those pipes manually. You seem to be passing those redirection characters directly as arguments to the a.out program. Try running this in your shell:

./a.out '<' in.txt '>' out.txt

See if a.out terminates then as well.