php to python inter-process communication with large data by json

Question

my php code:

<?php
$data = array('as', 'df', 'gh');
$result=shell_exec("start test.py ".escapeshellarg(json_encode($data)));
?>

test.py code:

import sys
import json
try:
    print json.loads(sys.argv[1])
except:
    print "ERROR"
print
raw_input()

it's failing to try and showing ERROR. while if change my python code to this:

import sys
try:
    data=sys.argv[1]
except:
    print "ERROR"
print data,
raw_input()

i'm getting the output as: [ as , df , gh ]

as i'm passing a json encoded data, i should be able to decode it with python's json.loads() method. but why it's not working?

Answer 1

don't know how it's working. but able to tune the program according to what i want.

php code:

<?php
$data = array('1'=>"as",'2'=>"df",'3'=>"gh");
$result=shell_exec("start test.py ".json_encode(json_encode($data)));
?>

test.py:

import sys
import json

try:
    data=sys.argv[1]
except:
    print "ERROR"

print data
dit=json.loads(data)
print dit
print dit['1']
raw_input()

and got the output as required:

{"1":"as","2":"df","3":"gh"}
{u'1': u'as', u'3': u'gh', u'2': u'df'}
as

someone having a good knowledge in these pls explain.

Answer 2

The problem is the following:

On Windows, escapeshellarg() removes percent signs, replaces double quotes with spaces and adds double quotes around the string.

-> https://secure.php.net/manual/en/function.escapeshellarg.php

I'd recommend using addslashes(...)

exec("test.py " . addslashes(json_encode($json)) . " 2>&1", $output, $exit_code);