What is the best way to call a script from another script

Question

I have a script named test1 py which is not in a module  It just has code that should execute when the script itself is run  There are no functions  classes  methods  etc  I have another script which runs as a service  I want to call test1 py from the script running as a service  For example  File test1 py  print  quot I am a test quot  print  quot see  I do nothing productive  quot   File service py    Lots of stuff here test1 py   do whatever is in test1 py  I m aware of one method which is opening the file  reading the contents  and basically evaluating it  I m assuming there s a better way of doing this  Or at least I hope so

User · Answer

Another way   File test1 py   print  test1 py    File service py   import subprocess  subprocess call  test1 py   shell True    The advantage to this method is that you don t have to edit an existing Python script to put all its code into a subroutine   Documentation  Python 2  Python 3

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Use import test1 for the 1st use - it will execute the script  For later invocations  treat the script as an imported module  and call the reload test1  method   When reload module  is executed   Python modules    code is recompiled and the module-level code reexecuted  defining a new set of objects which are bound to names in the module   s dictionary  The init function of extension modules is not called   A simple check of sys modules can be used to invoke the appropriate action  To keep referring to the script name as a string   test1    use the  import    builtin  import sys if sys modules has key  test1        reload sys modules  test1    else        import    test1

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Add this to your python script  import os os system  quot exec  path to another script quot    This executes that command as if it were typed into the shell

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If you want test1 py to remain executable with the same functionality as when it s called inside service py  then do something like   test1 py  def main        print  I am a test      print  see  I do nothing productive    if   name         main         main     service py  import test1   lots of stuff here test1 main     do whatever is in test1 py

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I prefer runpy      usr bin env python   coding  utf-8  import runpy  runpy run path path name  script-01 py   runpy run path path name  script-02 py   runpy run path path name  script-03 py

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As it s already mentioned  runpy is a nice way to run other scripts or modules from current script    By the way  it s quite common for a tracer or debugger to do this  and under such circumstances methods like importing the file directly or running the file in a subprocess usually do not work   It also needs attention to use exec to run the code  You have to provide proper run globals to avoid import error or some other issues  Refer to runpy  run code for details

User · Answer

You should not be doing this   Instead  do   test1 py    def print test          print  I am a test        print  see  I do nothing productive     service py   near the top from test1 import print test  lots of stuff here print test

User · Answer

import os  os system  python myOtherScript py arg1 arg2 arg3       Using os you can make calls directly to your terminal  If you want to be even more specific you can concatenate your input string with local variables  ie   command    python myOtherScript py     sys argv 1          sys argv 2  os system command

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This is an example with subprocess library   import subprocess  python version    3  path to run        py name      main   py     args    f python python version    f  path to run  py name       Avaible in python3 args     python    format python version          format path to run  py name    res   subprocess Popen args  stdout subprocess PIPE  output  error    res communicate    if not error       print output  else      print error

User · Answer

This is possible in Python 2 using  execfile  test2 py     See the documentation for the handling of namespaces  if important in your case   In Python 3  this is possible using  thanks to  fantastory   exec open  test2 py   read      However  you should consider using a different approach  your idea  from what I can see  doesn t look very clean

User · Answer

Why not just import test1  Every python script is a module  A better way would be to have a function e g  main run in test1 py  import test1 and run test1 main    Or you can execute test1 py as a subprocess

User · Answer

This process is somewhat un-orthodox  but would work across all python versions   Suppose you want to execute a script named  recommend py  inside an  if  condition  then use   if condition         import recommend   The technique is different  but works

User · Answer

The usual way to do this is something like the following   test1 py  def some func        print  in test 1  unproductive   if   name         main           test1 py executed as script       do something     some func     service py  import test1  def service func        print  service func   if   name         main           service py executed as script       do something     service func       test1 some func

[python] What is the best way to call a script from another script?

File test1.py:

File service.py:

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