Custom M code in Python example?

#!/bin/bash

# M109 in your G code program will run the Linux commands in this
# shell script "batch" file, passing the P and Q variables as command
# line arguments.

# M code to set EXTRUDER 0 temperature and wait until temperature has been reached

echo "Usage: M109 Pn - where n is the temperature"

# give the command line arguments descriptive names
P=$1
#Q=$2

TOLERANCE=0.5

PV=$(halcmd gets ext0-PV)

halcmd sets ext0-SP $P

#bash cannot do floating point comparison

SP=$(echo "($P-$TOLERANCE)"| bc -l)
delta=`echo "scale=3; ($PV < $SP)"| bc -l`


while [ "$delta" != "0" ]
do
  PV=$(halcmd gets ext0-PV)
  delta=`echo "scale=3; ($PV < $SP)"| bc -l`
  sleep 1
done

echo "Temperature reached"

# if a M1nn command exits with nonzero status,
# the gcode program exits.  So always exit 0.
exit 0 ;# 0 for success

#!/usr/bin/env python
import sys
import hal

tempcomp = hal.component("_dummy_")
value = hal.get_value("ext0-PV")
print value

variable = sys.argv[1]
print variable
hal.set_p('ext0-PV', '%s'%variable)

#!/usr/bin/env python2

# Note! Change the above python2 to python is not using Arch Linux

# M code to set EXTRUDER 0 temperature
# M104 in your G code program will run the python code in this file, 
# passing the P and Q variables as command line arguments.

import sys
import hal

h = hal.component("M104")

print "Usage: M104 Pn - where n is the Extruder temperature"

P = sys.argv[1]
Q = sys.argv[2]

print P
print Q

h.newpin("PV", hal.HAL_FLOAT, hal.HAL_IO)
hal.connect("M104.PV", "BLtouch-SP")
hal.set_p("M104.PV", "%s"%P)

# spiPRU command outputs

	net bed-heater-SP => 	spiPRU.SP.0
	net ext0-heater-SP  => 	spiPRU.SP.1
	net ext0-cooling-SP => 	spiPRU.SP.2
	net BLtouch-SP => 	spiPRU.SP.3

h.newpin("PV", hal.HAL_FLOAT, hal.HAL_IN)
hal.connect("M104.PV", "BLtouch-SP")
h['PV'] = P

h.newpin("PV", hal.HAL_FLOAT, hal.HAL_IN)
msg=Popen('halcmd net BLtouch-SP M104.PV', shell=True, stdout=PIPE).stdout.read()
h['PV'] = P