Executing Python script from Laravel 4 Controller

Question

I'm trying to execute a Python script from my Controller. In my controllers directory I created a folder called pythonScripts in which I have placed my script. From my controller function I am getting data from the database, in json format, and passing it to python to create a network and then do some analysis on the network using networkx. The problem is that i'm unable to execute the script. The following is my code for runing the script.

$output = array();
exec("/pythonScripts/createNetwork.py '{$connections}' ", $output);
return json_encode($output);

Where $connections is JSON data about a users connections with other users.

In the python script, at the moment, I'm only printing out whatever is passed in to see if the script is being executed but in return I get an empty array []. The following is my python script.

import json
import networkx as nx 
import sys
from networkx.readwrite import json_graph


def main():
    userJSONData = sys.argv[1] #the JSON format of user data will be passed into this script.
    print userJSONData


if __name__ == '__main__':
    main()

I can't tell if the script is executing ... any help?

unrelated: to parse json data: data = json.loads(sys.argv[1]) — jfs
– jfs, Commented May 5, 2014 at 10:25

Antonio Carlos Ribeiro · Accepted Answer · 2014-05-05 12:19:40Z

3

You must get the return value from your script execution to check if it was successful (== 0) and if your script is not executable, you must also call python:

exec("/usr/bin/python /pythonScripts/createNetwork.py '{$connections}'", $output, $return);

if ($return) {
    throw new \Exception("Error executing command - error code: $return");
}

var_dump($output);

edited May 5, 2014 at 12:19

answered May 4, 2014 at 23:39

Antonio Carlos Ribeiro

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8 Comments

Haseeb Over a year ago

Thanks, I get the following in firebug. "type":"Exception","message":"Error executing command - error code: 127

Haseeb Over a year ago

And now my exec() looks the same as yours. exec("python /pythonScripts/createNetwork.py '{$connections}' ", $output, $return);

Haseeb Over a year ago

So apparently code 127 means command not found ... why is it giving this??

Haseeb Over a year ago

Thanks @Antonio, for the answer. It wasn't the python path that I had to tell the script, apparently I had to specify the exact path of the script. It works now. Thanks again.

Antonio Carlos Ribeiro Over a year ago

You can keep it "relative" by using app_path().'/controllers/pythonScript/script.py'

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