threads and subprocess.call

[snippsat]

Using call or run it will not run subprocesses in parallel.
Popen release so it run in parallel.
Here a test.
Running this it wait 20-sec then do ping one bye one.

from subprocess import Popen, call, run

# ping -c 4 google.com ## Linux
commands = [
    'sleep 20',
    'ping -n 4 google.com',
    'ping -n 4 cnn.com'
]
# Try run in parallel
processes = [call(cmd, shell=True) for cmd in commands]

'''
for p in processes:
    p.wait()'''

Now you see that ping and sleep start in parallel all at once.

from subprocess import Popen, call, run

# ping -c 4 google.com ## Linux
commands = [
    'sleep 20',
    'ping -n 4 google.com',
    'ping -n 4 cnn.com'
]
# Try run in parallel
processes = [Popen(cmd, shell=True) for cmd in commands]

'''
for p in processes:
    p.wait()'''