Using a Python subprocess call to invoke a Python script

Question

I have a Python script that needs to invoke another Python script in the same directory  I did this   from subprocess import call call  somescript py     I get the following error   call  somescript py   File   usr lib python2 6 subprocess py   line 480  in call return Popen  popenargs    kwargs  wait   File   usr lib python2 6 subprocess py   line 633  in   init   errread  errwrite  File   usr lib python2 6 subprocess py   line 1139  in  execute child  raise child exception OSError   Errno 2  No such file or directory   I have the script somescript py in the same folder though  Am I missing something here

User · Answer

subprocess call expects the same arguments as subprocess Popen - that is a list of strings  the argv in C  rather than a single string   It s quite possible that your child process attempted to run  s  with the parameters  o    m    e

User · Answer

What s wrong with  import sys from os path import dirname  abspath  local dir   abspath dirname   file     sys path append local dir   import somescript   or better still wrap the functionality in a function  e g  baz  then do this   import sys from os path import dirname  abspath  local dir   abspath dirname   file     sys path append local dir   import somescript somescript baz     There seem to be a lot of scripts starting python processes or forking  is that a requirement

User · Answer

Check out this   from subprocess import call  with open  directory of logfile logfile txt    w   as f     call   python    directory of called python file called python file py    stdout f

User · Answer

First  check if somescript py is executable and starts with something along the lines of    usr bin python  If this is done  then you can use subprocess call    somescript py     Or as another answer points out  you could do subprocess call   python    somescript py

User · Answer

The subprocess call is a very literal-minded system call  it can be used for any generic process   hence does not know what to do with a Python script automatically   Try   call   python somescript py     If that doesn t work  you might want to try an absolute path  and or check permissions on your Python script   the typical fun stuff

User · Answer

If you re on Linux Unix you could avoid call   altogether and not execute an entirely new instance of the Python executable and its environment   import os  cpid   os fork   if not cpid      import somescript     os  exit 0   os waitpid cpid  0    For what it s worth

User · Answer

Windows  Unix     Unix will need a shebang and exec attribute to work      usr bin env python   as the first line of script and   chmod u x script py   at command-line or   call  python script py  split      as mentioned previously   Windows should work if you add the shell True parameter to the  call  call

User · Answer

If  somescript py  isn t something you could normally execute directly from the command line  I e      somescript py works   then you can t call it directly using call   Remember that the way Popen works is that the first argument is the program that it executes  and the rest are the arguments passed to that program  In this case  the program is actually python  not your script  So the following will work as you expect   subprocess call   python    somescript py   somescript arg1  somescript val1          This correctly calls the Python interpreter and tells it to execute your script with the given arguments   Note that this is different from the above suggestion   subprocess call   python somescript py      That will try to execute the program called python somscript py  which clearly doesn t exist   call  python somescript py   shell True    Will also work  but using strings as input to call is not cross platform  is dangerous if you aren t the one building the string  and should generally be avoided if at all possible

User · Answer

def main argv       host   argv 0      type   argv 1      val   argv 2       ping   subprocess Popen   python ftp py  s  s  s   host type val   stdout   subprocess PIPE stderr   subprocess PIPE shell True      out   ping communicate   0      output   str out      print output

[python] Using a Python subprocess call to invoke a Python script

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