Command line failed but works with cli

Configuration
1

Hi I want to run this python script with a command line switch:

import serial
ser = serial.Serial('/dev/ttyS1', 9600)
ser.write(bytearray('5','ascii'))

here is my conf

switch:
  platform: command_line
  switches:
    arest_pin_four:
      command_on: "/usr/bin/python3 --version"
      command_off: "/usr/bin/python3 /home/homeassistant/testSerial.py"

so this is a test but the on command works (easy of course)
but the off fails

[homeassistant.components.switch.command_line] Command failed:/usr/bin/python3 /home/homeassistant/testSerial.py

what is strange is that the command works in shell interface (with the user homeassistant): /usr/bin/python3 /home/homeassistant/testSerial.py

2

How did you install Home Assistant - Hassbian, Docker, Hass.io, Synology, something else?

3

I’ve intalled it on an orange pi with armbian python 3 virtual env.
I’m wondering if it could be that the pyserial lib should installed specifically in the virtual env.
I’m looking to the doc actually

4

Yes, you’ll need any library you’re using installed in the venv