How to run a Python script from another Python script in the cross-platform way?

Question

Here is the problem...

I'm writing very small plugin for Blender, I have 10 python scripts, they parsing different file formats by using command-line, and I have a Main Python script to run all other scripts with proper commands...

for example, "Main.py" include:

txt2cfg.py -inFile -outFile...
ma2lxo.py -inFile -outFile...

Blender already include Python, so I can run "Main.py" from Blender, But I need it to work with both PC and MAC, and also doesn't require Python installation, so I can't use:

execfile(' txt2cfg.py -inFile -outFile ')
os.system(' ma2lxo.py -inFile -outFile ')
or even import subprocess

because they required Python installation in order to run *.py files.

Sorry for language

Thanks

"and also doesn't require Python installation". Bad idea. Just install Python. Life is much simpler. — S.Lott
– S.Lott, Commented Aug 31, 2011 at 20:13
If you can't push anyone to install the platform, how can you push anyone to run your application? — S.Lott
– S.Lott, Commented Aug 31, 2011 at 20:21
As friendly as possible means simple, right? That means Python is required and your main script simply does import to incorporate the 10 other processes. That's simple. — S.Lott
– S.Lott, Commented Aug 31, 2011 at 20:25

Dunes · Accepted Answer · 2011-08-31 20:11:55Z

4

If you really need to execute a python script in a new process and you don't know where the interpreter you want is located then use the sys module to help out.

import sys
import subprocess

subprocess.Popen((sys.executable, "script.py"))

Though importing the module (dynamically if need be) and then running its main method in another script is probably a better idea.

answered Aug 31, 2011 at 20:11

Dunes

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S.Lott · Accepted Answer · 2011-08-31 20:27:36Z

3

for example, "Main.py" include:

txt2cfg.py -inFile -outFile... ma2lxo.py -inFile -outFile...

Two things.

Each other script needs a main() function and a "main-import switch". See http://docs.python.org/tutorial/modules.html#executing-modules-as-scripts for hints on how this must look.

Import and execute the other scripts.

import txt2cfg
import ma2lxo
txt2cfg.main( inFile, outFile )
ma2lxo.main( inFile, outFile )

This is the simplest way to do things.

answered Aug 31, 2011 at 20:27

S.Lott

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Sunjay Varma · Accepted Answer · 2011-08-31 19:58:31Z

1

Two options:

Use py2exe to bundle the interpreter with the scripts.
Import the modules and call the functions automatically.

answered Aug 31, 2011 at 19:58

Sunjay Varma

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2 Comments

Sunjay Varma Over a year ago

Haha sorry! But you could use py2exe and py2app!

Sunjay Varma Over a year ago

Yup! No problem! Although I haven't used it much, it is possible that py2app might require you to have a mac then compile on that. FYI

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