NodeJS python-shell i

Question

i want to run a python script via nodejs with python-shell to simply turn a led via my raspberry pi on. The script works pretty well, but i cant run it via the nodejs

my NodeJS:

var PythonShell = require('python-shell');

PythonShell.run('ledtest.py', function (err) {
        if (err) throw err;
        console.log('finished');
});

my PythonScript:

import serial
import time

s = serial.Serial('/dev/ttyACM0', 9600)
s.close()
s.open()
time.sleep(5)


s.write("1")
time.sleep(2)
s.write("0")

error

  events.js:160
        throw er; // Unhandled 'error' event
          ^

    Error: spawn python ENOENT
        at exports._errnoException (util.js:953:11)
        at Process.ChildProcess._handle.onexit 
(internal/child_process.js:182:32)
        at onErrorNT (internal/child_process.js:348:16)
        at _combinedTickCallback (internal/process/next_tick.js:74:11)
        at process._tickCallback (internal/process/next_tick.js:98:9)
        at Function.Module.runMain (module.js:577:11)
        at startup (node.js:160:18)
        at node.js:449:3

thanks for suggestions

my python architecture is 32 bit and nodejs is arm. maybe this could be the course? — Domagalla
– Domagalla, Commented May 23, 2016 at 14:15
Python comes installed on most raspberry pi OS's so I highly doubt you have 32bit installed since that would fail to even install since the Pi has an ARM processor — OneCricketeer
– OneCricketeer, Commented May 23, 2016 at 14:45
@Domagalla: Are you running the Node.js script on the Raspberry Pi? I am unable to reproduce your problem. I am using a Raspberry Pi with Raspbian 7.8, node v0.10.41, and python-shell 0.4.0. I also have a USB-to-Serial converter so that I can run your script. My only change is to use /dev/ttyUSB0. — user3657941
– user3657941, Commented May 23, 2016 at 16:53
yes i am running on raspberry pi but using ArchLinux. the usb port is the right one to me as well. now i elude the problem while directly communicate with the gpios via nodejs — Domagalla
– Domagalla, Commented May 23, 2016 at 19:29

kovac · Accepted Answer · 2018-04-20 07:06:09Z

1

You need to provide some options like the python path and directory containing your script. I would write your NodeJS script like:

var PythonShell = require('python-shell');

const options = {
    mode: 'text',
    pythonPath: '/path/to/python',
    pythonOptions: ['-u'],
    scriptPath: '/directory/containing/python/script',
  };

PythonShell.run('ledtest.py', function (err) {
        if (err) throw err;
        console.log('finished');
});

You can get the python path from your Python3 shell like:

import sys
print(sys.executable)

More information on python-shell options can be found here

answered Apr 20, 2018 at 7:06

kovac

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