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subprocess.run(args, *, stdin=None, input=None, stdout=None, stderr=None, capture_output=False, shell=False, cwd=None, timeout=None, check=False, encoding=None, errors=None, text=None, env=None, universal_newlines=None)

# Execute the command ls -l /dev/null
>>> subprocess.run(["ls", "-l", "/dev/null"])
crw-rw-rw-  1 root  wheel    3,   2  5  4 13:34 /dev/null
CompletedProcess(args=['ls', '-l', '/dev/null'], returncode=0)

import subprocess
def runcmd(command):
    ret = subprocess.run(command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8", timeout=1)
    if ret.returncode == 0:
        print("success:", ret)
    else:
        print("error:", ret)

runcmd(["dir", "/b"])  # Sequence parameters
runcmd("exit 1")  # String parameter

success: CompletedProcess(args=['dir', '/b'], returncode=0, stdout='test.py\n', stderr='')
error: CompletedProcess(args='exit 1', returncode=1, stdout='', stderr='')

class subprocess.Popen(args, bufsize=-1, executable=None, stdin=None, stdout=None, stderr=None, 
preexec_fn=None, close_fds=True, shell=False, cwd=None, env=None, universal_newlines=False, 
startupinfo=None, creationflags=0, restore_signals=True, start_new_session=False, pass_fds=(),
*, encoding=None, errors=None)

>>> import subprocess
>>> p = subprocess.Popen('ls -l', shell=True)
>>> total 164
-rw-r--r--  1 root root   133 Jul  4 16:25 admin-openrc.sh
-rw-r--r--  1 root root   268 Jul 10 15:55 admin-openrc-v3.sh
...
>>> p.returncode
>>> p.wait()
0
>>> p.returncode

import time
import subprocess

def cmd(command):
    subp = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8")
    subp.wait(2)
    if subp.poll() == 0:
        print(subp.communicate()[1])
    else:
        print("Failed")

cmd("java -version")
cmd("exit 1")

java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)

Failed