use call method

subprocess.call('echo $USER',shell=True) 

Altarnetivly:

var = subprocess.check_output('echo $USER',shell=True) # .rstrip('\n') print var 

use call method

subprocess.call('echo $USER',shell=True) 

Altarnetivly:

var = subprocess.check_output('echo $USER',shell=True) # .rstrip('\n') print var 

Also with subprocess.Popen()

process = subprocess.Popen("echo $USER",shell=True,stdout=subprocess.PIPE) print process.communicate()[0], 

use call method

subprocess.call('echo $USER',shell=True) 

use call method

subprocess.call('echo $USER',shell=True) 

Altarnetivly:

var = subprocess.check_output('echo $USER',shell=True) # .rstrip('\n') print var