How to execute a command prompt command from python

Question

I tried something like this  but with no effect   command    cmd exe  proc   subprocess Popen command  stdin   subprocess PIPE  stdout   subprocess PIPE  proc stdin write  dir c

User · Answer

how about simply   import os os system  dir c

User · Answer

Try   import os  os popen  Your command here

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Try adding a call to proc stdin flush   after writing to the pipe and see if things start behaving more as you expect  Explicitly flushing the pipe means you don t need to worry about exactly how the buffering is set up   Also  don t forget to include a   n  at the end of your command or your child shell will sit there at the prompt waiting for completion of the command entry   I wrote about using Popen to manipulate an external shell instance in more detail at  Running three commands in the same process with Python  As was the case in that question  this trick can be valuable if you need to maintain shell state across multiple out-of-process invocations on a Windows machine

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From Python you can do directly using below code import subprocess proc   subprocess check output  C  Windows System32 cmd exe  k  windir  System32  reg exe ADD HKLM SOFTWARE Microsoft Windows CurrentVersion Policies System  v EnableLUA  t REG DWORD  d 0  f   stderr subprocess STDOUT shell True      print str proc    in first parameter just executed User Account setting you may customize with yours

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Using   and  quot  at the same time works great for me  Windows 10  python 3  import os os system   quot some cmd command here quot     for example to open my web browser I can use this  os system   quot C  Program Files  x86  Google Chrome Application chrome exe quot      Edit  for an easier way to open your browser I can use this  import webbrowser webbrowser open  website or leave it alone if you only want to open the  browser

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Why do you want to call cmd exe   cmd exe is a command line  shell   If you want to change directory  use os chdir  C       Try not to call external commands if Python can provide it  In fact  most operating system commands are provide through the os module  and sys   I suggest you take a look at os module documentation to see the various methods available

User · Answer

It s very simple  You need just two lines of code with just using the built-in function and also it takes the input and runs forever until you stop it  Also that  cmd  in quotes  leave it and don t change it  Here is the code  import os os system  cmd    Now just run this code and see the whole windows command prompt in your python project

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Taking some inspiration from Daren Thomas s answer  and edit   try this   proc   subprocess Popen  dir C      shell True  stdin subprocess PIPE  stdout subprocess PIPE  out  err   proc communicate     out will now contain the text output   They key nugget here is that the subprocess module already provides you shell integration with shell True  so you don t need to call cmd exe directly   As a reminder  if you re in Python 3  this is going to be bytes  so you may want to do out decode   to convert to a string

User · Answer

You probably want to try something like this   command    cmd exe  C dir C      I don t think you can pipe into cmd exe    If you are coming from a unix background  well  cmd exe has some ugly warts   EDIT  According to Sven Marnach  you can pipe to cmd exe  I tried following in a python shell    gt  gt  gt  import subprocess  gt  gt  gt  proc   subprocess Popen  cmd exe   stdin   subprocess PIPE  stdout   subprocess PIPE   gt  gt  gt  stdout  stderr   proc communicate  dir c       gt  gt  gt  stdout  Microsoft Windows  Version 6 1 7600  r nCopyright  c  2009 Microsoft Corporatio n   All rights reserved  r n r nC   Python25 gt More      As you can see  you still have a bit of work to do  only the first line is returned   but you might be able to get this to work

[python] How to execute a command prompt command from python

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