Python subprocess: wait for command to finish before starting next one?

Question

I\'ve written a Python script that downloads and converts many images, using wget and then ImageMagick via chainedsubprocess calls:

for img in          


        

Answer 1

See Using module 'subprocess' with timeout

Not sure if this is the proper way of doing it, but this is how I accomplish this:

import subprocess
from threading import Thread

def call_subprocess(cmd):
    proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = proc.communicate()
    if err:
        print err

thread = Thread(target=call_subprocess, args=[cmd])
thread.start()
thread.join() # waits for completion.