Execute system command method in Python environment

Method 1:os.system>>>import os>>>os.system (' ls ') anaconda-ks.cfg  django-1.2.7   install.log.syslog  ptyprocess-0.5.1    server1.py      Public      Document a.py         docker         mysite            pycharm-2016.3.2    server.py     Templates      Download client1.py     docker-1.7.1  paramiko-2.1.1        pycharm-license.txt    setuptools-2.0     Video       Music client.py     install.log   pexpect-4.2.1        pycrypto-2.6.1    spawn-0.1     Pictures       Desktop 0>>> SquareFA 2:os.popen>>>import os>>>tmp = os.popen (' ls ') >>>tmp.readlines () anaconda-ks.cfg  django-1.2.7  install.log.syslog  ptyprocess-0.5.1     server1.py     Public      Document a.py          docker        mysite            pycharm-2016.3.2    server.py      Templates      Download client1.py     docker-1.7.1   paramiko-2.1.1       pycharm-license.txt     setuptools-2.0     Video      Music client.py      install.log   pexpect-4.2.1       pycrypto-2.6.1     spawn-0.1     Pictures     Desktop 0>>> Method 3:subprocess>>> import subprocess>>>  subprocess.call ((' ls '), shell=true) Anaconda-ks.cfg  django-1.2.7  install.log.syslog   ptyprocess-0.5.1    server1.py     Public       Document a.py         docker         mysite           pycharm-2016.3.2     server.py     templates      Download client1.py      docker-1.7.1  paramiko-2.1.1        pycharm-license.txt    setuptools-2.0     Video      Music client.py     install.log   pexpect-4.2.1        pycrypto-2.6.1    spawn-0.1     Pictures      Desktop 0>>>>>>p =  Subprocess. Popen (' ls ', shell=true,stdout=subprocess. Pipe,stderr=subprocess. STDOUT) >>>p.stdout.readlines (): [' anaconda-ks.cfg\n ',  ' a.py\n ',  ' client1.py\n ',  ' client.py\n ',  ' django-1.2.7\n ',  ' docker\n ',  "docker-1.7.1\n ',  ' install.log\n ',  ' install.log.syslog\n ',  ' mysite\n ',  ' paramiko-2.1.1\n ',  ' pexpect-4.2.1\n ',  ' ptyprocess-0.5.1\n ',  ' pycharm-2016.3.2\n ',  ' pycharm-license.txt\n ',  ' pycrypto-2.6.1\n ',  ' server1.py\n ',  ' server.py\n ',  ' setuptools-2.0\n ',  ' spawn-0.1\n ',  ' \xe5\x85\xac\xe5\x85\xb1 \xe7\x9a\x84\n ',  ' \xe6\xa8\xa1\xe6\x9d\xbf\n ',  ' \xe8\xa7\x86\xe9\xa2\x91\n ',  ' \xe5\x9b\xbe\xe7\ x89\x87\n ',  ' \xe6\x96\x87\xe6\xa1\xa3\n ',  ' \xe4\xb8\x8b\xe8\xbd\xbd\n ',  ' \xe9\x9f\xb3\xe4\xb9\ x90\n ',  ' \xe6\xa1\x8c\xe9\x9d\xa2\n '] method 4:commands>>>import coMmands>>>commands.getoutput (' date ') >>> ' 2017\xe5\xb9\xb4 05\xe6\x9c\x88 08\xe6\x97\ XA5 \XE6\X98\X9F\XE6\X9C\X9F\XE4\XB8\X80 18:26:25 CST ' >>>commands.getstatusoutput (' Date ') >>> (0,  ' 2017\xe5\xb9\xb4 05\xe6\x9c\x88 08\xe6\x97\xa5 \xe6\x98\x9f\xe6\x9c \X9F\XE4\XB8\X80 18:27:24 CST ')

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Execute system command method in Python environment