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Running operating system commands from your Python program

As from Python 2.6, os.popen and friends are deprecated methods and you should use the subprocess module for subprocesses. So that's the way to go if you want to run operating system commands. New example showing this - [here]

Starting with:
from subprocess import *

I can run a process and allow its output to to stdout via the call utility:

stuff0 = call("ls")

I can run a process and capture its output to a variable (2 examples):

stuff1 = Popen(["ls"], stdout=PIPE).communicate()[0]
stuff2 = Popen(["ls","-l"], stdout=PIPE).communicate()[0]


And I can open a process that I can then read back from it (2 more examples):

pingalong = Popen("ping -q -c2 192.168.200.134", shell=True, stdout=PIPE).stdout
pingalot = Popen(["ping","-q","-c2","192.168.200.115"], stdout=PIPE).stdout


Note the use of shell=True to push the incoming command through the shell, rather than have to split up the command and parameters yourself.



(written 2010-05-14, updated 2010-05-15)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Y108 - Python - String Handling
  [4659] Prining a pound sign from Python AND running from the command line at the same time - (2016-03-03)
  [4595] Python formatting update - including named completions - (2015-12-10)
  [4593] Command line parameter handling in Python via the argparse module - (2015-12-08)
  [4360] Python - comparison of old and new string formatters - (2014-12-22)
  [4307] Identifying and clearing denial of service attacks on your Apache server - (2014-09-27)
  [4213] Formatting options in Python - (2013-11-16)
  [4152] Why are bus fares so high? - (2013-08-18)
  [4027] Collections in Python - list tuple dict and string. - (2013-03-04)
  [3886] Formatting output - why we need to, and first Python example - (2012-10-09)
  [3796] Backquote, backtic, str and repr in Python - conversion object to string - (2012-07-05)
  [3469] Teaching dilemma - old tricks and techniques, or recent enhancements? - (2011-10-08)
  [3468] Python string formatting - the move from % to str.format - (2011-10-08)
  [3349] Formatting output in Python through str.format - (2011-07-07)
  [3218] Matching a license plate or product code - Regular Expressions - (2011-03-28)
  [3090] Matching to a string - what if it matches in many possible ways? - (2010-12-17)
  [2814] Python - splitting and joining strings - (2010-06-16)
  [2780] Formatted Printing in Python - (2010-05-25)
  [2721] Regular Expressions in Python - (2010-04-14)
  [2692] Flexible search and replace in Python - (2010-03-25)
  [2406] Pound Sign in Python Program - (2009-09-15)
  [2284] Strings as collections in Python - (2009-07-12)
  [1876] Python Regular Expressions - (2008-11-08)
  [1608] Underlining in Perl and Python - the x and * operator in use - (2008-04-12)
  [1517] Python - formatting objects - (2008-01-24)
  [1195] Regular Express Primer - (2007-05-20)
  [1110] Python - two different splits - (2007-03-15)
  [970] String duplication - x in Perl, * in Python and Ruby - (2006-12-07)
  [954] Splitting Pythons in Bradford - (2006-11-29)
  [943] Matching within multiline strings, and ignoring case in regular expressions - (2006-11-25)
  [903] Pieces of Python - (2006-10-23)
  [773] Breaking bread - (2006-06-22)
  [560] The fencepost problem - (2006-01-10)
  [496] Python printf - (2005-11-15)
  [463] Splitting the difference - (2005-10-13)
  [324] The backtick operator in Python and Perl - (2005-05-25)

Y115 - Additional Python Facilities
  [4709] Some gems from Intermediate Python - (2016-10-30)
  [4536] Json load from URL, recursive display, Python 3.4 - (2015-10-14)
  [4451] Running an operating system command from your Python program - the new way with the subprocess module - (2015-03-06)
  [4439] Json is the new marshall, pickle and cPickle / Python - (2015-02-22)
  [4298] Python - an interesting application - (2014-09-18)
  [4211] Handling JSON in Python (and a csv, marshall and pickle comparison) - (2013-11-16)
  [4085] JSON from Python - first principles, easy example - (2013-05-13)
  [3442] A demonstration of how many Python facilities work together - (2011-09-16)
  [3089] Python regular expressions - repeating, splitting, lookahead and lookbehind - (2010-12-17)
  [2790] Joining a MySQL table from within a Python program - (2010-06-02)
  [2786] Factory methods and SqLite in use in a Python teaching example - (2010-05-29)
  [2764] Python decorators - your own, staticmethod and classmethod - (2010-05-14)
  [2746] Model - View - Controller demo, Sqlite - Python 3 - Qt4 - (2010-04-29)
  [2745] Connecting Python to sqlite and MySQL databases - (2010-04-28)
  [2655] Python - what is going on around me? - (2010-02-28)
  [2462] Python - how it saves on compile time - (2009-10-20)
  [2435] Serialization - storing and reloading objects - (2009-10-04)
  [2407] Testing code in Python - doctest, unittest and others - (2009-09-16)
  [1337] A series of tyre damages - (2007-09-08)
  [1336] Ignore case in Regular Expression - (2007-09-08)
  [1305] Regular expressions made easy - building from components - (2007-08-16)
  [1149] Turning objects into something you can store - Pickling (Python) - (2007-04-15)
  [1136] Buffering output - why it is done and issues raised in Tcl, Perl, Python and PHP - (2007-04-06)
  [1043] Sending an email from Python - (2007-01-18)
  [901] Python - listing out the contents of all variables - (2006-10-21)
  [753] Python 3000 - the next generation - (2006-06-09)
  [672] Keeping your regular expressions simple - (2006-04-05)
  [663] Python to MySQL - (2006-03-31)
  [239] What and why for the epoch - (2005-03-08)
  [208] Examples - Gadfly, NI Number, and Tcl to C interface - (2005-02-10)
  [183] The elegance of Python - (2005-01-19)

Y303 - Python Network Programming
  [4087] Python network programming - new FTP and socket level examples - (2013-05-14)
  [2695] TCP v UDP / Client v Server - Python examples - (2010-03-25)
  [2694] Multiple processes (forking) in Python - (2010-03-25)
  [2368] Python - fresh examples of all the fundamentals - (2009-08-20)
  [2365] Counting Words in Python via the web - (2009-08-18)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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Your website and articles are one of the best I have seen in on the internet. Thank you so much for putting forth these write-ups of so many complex Python topics in a very easy to understand manner. [#3589]

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