running bash script from python file

Question

I have a bash script which changes the path on my command line, This one,

#!/usr/bin/env python
cd /mnt/vvc/username/deployment/

I have a python script which i wish to run after the path changes to the desired path,

The script,

#!/usr/bin/env python
import subprocess
import os
subprocess.call(['/home/username/new_file.sh'])

for folder in os.listdir(''):
print ('deploy_predict'+' '+folder)

I get this

 File "/home/username/new_file.sh", line 2
 cd /mnt/vvc/username/deployment/
                                ^
SyntaxError: invalid syntax

Any suggestions on how can i fix this?thanks in advance

Your script's syntax might be bash syntax, but you're telling your OS to run it using /usr/bin/env python (meaning: to run it interpreted as Python). I'd change the line #!/usr/bin/env python to #!/bin/bash — Savir
– Savir, Commented Jan 4, 2018 at 5:26
@BorrajaX Thanks,The error is gone,but the script doesn't change the path,on the command line it is still in the home directory — Ryan
– Ryan, Commented Jan 4, 2018 at 5:29
Subprocess spawns a different process than the terminal you're on (a brand new process). So you do cd in the spawned process, not in your terminal (not in your parent process) You can maybe understand it as if it opened another terminal? (dunno if that may confuse you more, though) — Savir
– Savir, Commented Jan 4, 2018 at 5:31
A little confused,but how do i get it to change path on my terminal using this script? — Ryan
– Ryan, Commented Jan 4, 2018 at 5:33
I really doubt that's what you wanna do... In any case, that'd depend on which terminal you're using and if it offers some kind of method to externally changing the directory. What is it you want to exaclty do? Usually, you cd in your spawned process, run whatever you need to run and capture its output — Savir
– Savir, Commented Jan 4, 2018 at 5:35

Zoe - Save the data dump · Accepted Answer · 2019-04-29 16:23:36Z

3

You need to explicitly tell subprocess which shell to run the sh file with. Probably one of the following:

subprocess.call(['sh', '/home/username/new_file.sh'])

subprocess.call(['bash', '/home/username/new_file.sh'])

However, this will not change the python program's working directory as the command is run in a separate context.

You want to do this to change the python program's working directory as it runs:

os.chdir('/mnt/vvc/username/deployment/')

But that's not really great practice. Probably better to just pass the path into os.listdir, and not change working directories:

os.listdir('/mnt/vvc/username/deployment/')

edited Apr 29, 2019 at 16:23

Zoe - Save the data dump

28.4k22 gold badges130 silver badges163 bronze badges

answered Jan 4, 2018 at 5:29

Daniel Centore

3,3491 gold badge21 silver badges42 bronze badges

Sign up to request clarification or add additional context in comments.

9 Comments

Ryan Over a year ago

Thanks Daniel, the error dissapears but it doesn't change path on the command line

Daniel Centore Over a year ago

You can't change the python program's working directory like that. The command executes in an external context. Just pass in the directory to os.listdir('/mnt/vvc/username/deployment/') and get rid of all that subprocess stuff.

Daniel Centore Over a year ago

Or you can use os.chdir('/mnt/vvc/username/deployment/') to change the python working directory

Ryan Over a year ago

But i have to run a file called deploy_predict on the terminal after the path change which takes in folder as the argument,if i do os.listdir,i wont be able to run it,

Daniel Centore Over a year ago

You need to update your original question with info about this deploy_predict nonsense, I have no idea what you're trying to get across.

|

Collectives™ on Stack Overflow

running bash script from python file

1 Answer 1

9 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

9 Comments

Your Answer

Sign up or log in

Post as a guest

Related