Run python script with args in javascript with exec

Question

I have inputs such as latitude, longitude and frequency. I would like to run this command on a JS file :

exec(`python test.py '{"latitude":${latitude},"longitude":${longitude},"frequency":${frequency}}'`, (error, stdout, stderr) => { .... })

But when I run I have the following error :

error: Command failed: python test.py '{"latitude":48.118097,"longitude":-1.636503,"frequency":2.4}'
Traceback (most recent call last):
  File "test.py", line 16, in <module>
    data=json.loads(sys.argv[1])
  File "C:\Users\****\AppData\Local\Programs\Python\Python38\lib\json\__init__.py", line 357, in loads
    return _default_decoder.decode(s)
  File "C:\Users\****\AppData\Local\Programs\Python\Python38\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Users\****\AppData\Local\Programs\Python\Python38\lib\json\decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

And my python script begin with

import sys
import json
data=json.loads(sys.argv[1])

Moreover if I just run my python script without args, and write random data directly in the python script, it works. So I think it's a problem of the args written in the exec command.

Can you please help me.

When I run the python script with my JS file I can't see the print of my python script. — Mo0nKizz
– Mo0nKizz, Commented Feb 19, 2020 at 21:39
I think this is because sys.argv[1] is already a string, so that string will now also contain the leading and trailing apostrophe. Try changing your test.py script to use data=json.loads(sys.argv[1].replace("'", "")) instead. — Matt Pitkin
– Matt Pitkin, Commented Feb 19, 2020 at 22:16

Barmar · Accepted Answer · 2020-02-19 22:05:51Z

1

Maybe add double quotes?

python test.py '\"{"latitude":48.118097,"longitude":-1.636503,"frequency":2.4}\"'

edited Feb 19, 2020 at 22:05

Barmar

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answered Feb 19, 2020 at 21:39

xana

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