Question

How do you specify what directory the python module subprocess uses to execute commands? I want to run a C program and process it’s output in Python in near realtime.

I want to excute the command (this runs my makefile for my C program:

make run_pci

In:

/home/ecorbett/hello_world_pthread

I also want to process the output from the C program in Python. I’m new to Python so example code would be greatly appreciated!

Thanks,
Edward

Answer 1

Use the cwd argument to Popen, call, check_call or check_output. E.g.

subprocess.check_output(["make", "run_pci"],
                        cwd="/home/ecorbett/hello_world_pthread")

Edit: ok, now I understand what you mean by “near realtime”. Try

p = subprocess.Popen(["make", "run_pci"],
                     stdout=subprocess.PIPE,
                     cwd="/home/ecorbett/hello_world_pthread")
for ln in p.stdout:
    # do processing