Subprocess changing directory

Question

I want to execute a script inside a subdirectory superdirectory  I need to be inside this sub super-directory first   I can t get subprocess to enter my subdirectory   tducin localhost   Projekty tests ve  python Python 2 7 4  default  Sep 26 2013  03 20 26    GCC 4 7 3  on linux2 Type  help    copyright    credits  or  license  for more information   gt  gt  gt  import subprocess  gt  gt  gt  import os  gt  gt  gt  os getcwd     home tducin Projekty tests ve   gt  gt  gt  subprocess call   cd       Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt    File   usr lib python2 7 subprocess py   line 524  in call     return Popen  popenargs    kwargs  wait     File   usr lib python2 7 subprocess py   line 711  in   init       errread  errwrite    File   usr lib python2 7 subprocess py   line 1308  in  execute child     raise child exception OSError   Errno 2  No such file or directory   Python throws OSError and I don t know why  It doesn t matter whether I try to go into an existing subdir or go one directory up  as above  - I always end up with the same error

User · Answer

You want to use an absolute path to the executable, and use the cwd kwarg of Popen to set the working directory. See the docs.

If cwd is not None, the child’s current directory will be changed to cwd before it is executed. Note that this directory is not considered when searching the executable, so you can’t specify the program’s path relative to cwd.

User · Answer

If you need to change directory  run a command and get the std output as well   import os import logging as log from subprocess import check output  CalledProcessError  STDOUT log basicConfig level log DEBUG   def cmd std output cd dir path  cmd       cmd to list   cmd split          try          if cd dir path              os chdir os path abspath cd dir path           output   check output cmd to list  stderr STDOUT  decode           return output     except CalledProcessError as e          log error  e      format e     def get last commit cc cluster        cd dir path     repos cc manager cc cluster      cmd    git log --name-status HEAD   HEAD --date iso      result   cmd std output cd dir path  cmd      return result  log debug  Output      format get last commit cc cluster        Output   commit 3b3daaaaaaaa2bb0fc4f1953af149fa3921e nAuthor  user1 lt user1 email com gt  nDate    2020-04-23 09 58 49  0200 n n

User · Answer

Another option based on this answer  https   stackoverflow com a 29269316 451710  This allows you to execute multiple commands  e g cd  in the same process   import subprocess  commands       pwd cd some-directory pwd cd another-directory pwd      process   subprocess Popen   bin bash   stdin subprocess PIPE  stdout subprocess PIPE  out  err   process communicate commands encode  utf-8    print out decode  utf-8

User · Answer

If you want to have cd functionality  assuming shell True  and still want to change the directory in terms of the Python script  this code will allow  cd  commands to work   import subprocess import os  def cd cmd        cmd is expected to be something like  cd  place       cmd   cmd      amp  amp  pwd    add the pwd command to run after  this will get our directory after running cd     p   subprocess Popen cmd  shell True  stdout subprocess PIPE  stderr subprocess PIPE  universal newlines True    run our new command     out   p stdout read       err   p stderr read         read our output     if out                print out          os chdir out 0 len out  - 1     if we did get a directory  go to there while ignoring the newline      if err                print err    if that directory doesn t exist  bash sh whatever env will complain for us  so we can just use that     return

User · Answer

subprocess call and other methods in the subprocess module have a cwd parameter   This parameter determines the working directory where you want to execute your process   So you can do something like this   subprocess call  ls   shell True  cwd  path to wanted dir      Check out docs subprocess popen-constructor

User · Answer

I guess these days you would do   import subprocess  subprocess run   pwd    cwd  sub-dir

User · Answer

To run your command as a subprocess in a different directory  pass cwd parameter  as suggested in  wim s answer   import subprocess  subprocess check call   your command    arg 1    arg 2    cwd working dir    A child process can t change its parent s working directory  normally   Running cd    in a child shell process using subprocess won t change your parent Python script s working directory i e   the code example in  glglgl s answer is wrong  cd is a shell builtin  not a separate executable   it can change the directory only in the same process

User · Answer

just use os chdir Example   gt  gt  gt  import os  gt  gt  gt  import subprocess  gt  gt  gt    Lets Just Say WE want To List The User Folders  gt  gt  gt  os chdir  quot  home  quot    gt  gt  gt  subprocess run  quot ls quot   user1 user2 user3 user4

User · Answer

What your code tries to do is call a program named cd     What you want is call a command named cd   But cd is a shell internal  So you can only call it as  subprocess call  cd      shell True    pointless code  See text below    But it is pointless to do so  As no process can change another process s working directory  again  at least on a UNIX-like OS  but as well on Windows   this call will have the subshell change its dir and exit immediately   What you want can be achieved with os chdir   or with the subprocess named parameter cwd which changes the working directory immediately before executing a subprocess   For example  to execute ls in the root directory  you either can do  wd   os getcwd   os chdir      subprocess Popen  ls   os chdir wd    or simply  subprocess Popen  ls   cwd

[python] Subprocess changing directory

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