Calling a python script from another python script with arguments does not work

Question

I am well aware that there are multiple threads dealing with this problem because I used them in an attempt to self-teach me how to do it. However, for me it does not work and I wondered if someone could help me find my error.

So I got one program (let's call it prog1) that calls a script for every string-variable like this:

os.system(r'C:\Users\user\docs\bla\script.py %s'%variable)

In script.py I now just wanted to test if this call worked by disabling all code but just doing:

def main(string):
    print(string)
    root

if __name__ == "__main__":
    print('I got executed')
    main(sys.argv[1])

The Problem is, if I execute prog1 nothing happens. No errer - so it runs through and the console pops up for a Brief second. However, nothing happens - no string is printed. If I execute script.py directly it works though.

EDIT: I got it to execute without error with the subprocess package by using:

subprocess.call(r'C:\...\script.py' %s' %variable,shell = True)

However, the problem stays the same - nothing happens. Or well, I noticed now that in the Background a Windows window pops up asking me with which program I want to execute files with the ending '.py' but this is not helping me, because I want to execute in console :(

You should use the subprocess module, it allows you to pass on arguments. — Chuk Ultima
– Chuk Ultima, Commented Jul 16, 2018 at 12:00

Chuk Ultima · Accepted Answer · 2018-07-16 12:18:06Z

1

Try using the subprocess module, it allows for more flexible parametres and other configuration changes :

import subprocess
subprocess.check_call(["python.exe", r"C:\Users\user\docs\bla\script.py", variable])

And when executed :

subprocess.check_call(["python", r"C:\Users\user\docs\bla\script.py", "Blue"])

I got executed

Blue

More information about the subprocess : https://docs.python.org/2/library/subprocess.html

edited Jul 16, 2018 at 12:18

answered Jul 16, 2018 at 12:02

Chuk Ultima

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7 Comments

Blue Over a year ago

Thank you for the quick Response, however this results now in the following error: OSError: [WinError 193] %1 is not a valid Win32 application

Chuk Ultima Over a year ago

My bad, went too fast. You need to add python as your first argument to your subprocess call.

Blue Over a year ago

ok, I really feel stupid now, but this does not execute as well for me, it gives the following error: TypeError: bufsize must be an integer

Blue Over a year ago

my bad, I forgot the brackets [...] - with this brackets it does not give an error anymore but it is stuck in an endless loop - it is never terminating - I think I nearly got every possible error there is by now xD

Chuk Ultima Over a year ago

I executed your exact code except for the root part. I don't know what meaning it holds without more context but I bet that causes your loop.

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