Linuxcnc and Python

hello
I did a serial communication with python, it works!
but i dont know how to make it interact with the linuxcnc
how do I get it to work with linuxcnc?

example:

to enter the MDI "m3 sxxx"
take the value of "s" should be passed to the python
python and make communication with the VFD

#! /usr/bin/python
import linuxcnc
import minimalmodbus

vfd_sinus = minimalmodbus.Instrument('/dev/ttyS0', 1)
s = linuxcnc.stat()
s.poll()

#spindle speed

if s.spindle_speed < 0:
set_rpm = ((s.spindle_speed**-1)/0.30)
else :
set_rpm = (s.spindle_speed/0.30)

vfd_sinus.write_register(4, set_rpm, 0)

# on/off spindle

onoff = vfd_sinus.read_register(5, 0)
bin_onoff = bin(onoff)
spindle_cmd = s.mcodes[2]
if spindle_cmd == 3 :
set_onoff = int(bin_onoff[2:12] + '0' + '1'+ '0', 2)
if spindle_cmd == 4 :
set_onoff = int(bin_onoff[2:12] + '1' + '0'+ '0', 2)
if spindle_cmd == 5 :
set_onoff = int(bin_onoff[2:12] + '0' + '0'+ '1', 2)

vfd_sinus.write_register(5, set_onoff, 0)

can do so:
minimod_EMC.py

=================
to HAL file :
loadusr python minimod_EMC.py
ps tried it with arduino