Python script to disable built-in Synaptics trackpad, and set up Apple Magic Trackpad the way I like it

setup_magic.py

#!/usr/bin/env python
# vim: set fileencoding=utf-8 :

import sys
import os
import re
import subprocess

def turn_off_tp(tp_id):
    subprocess.check_call(["xinput", "--disable", tp_id])

def set_midbutton():
    subprocess.check_call(["synclient", "EmulateMidButtonTime=100"])

def set_speed():
    subprocess.check_call(["synclient", "MinSpeed=1.65"])
    subprocess.check_call(["synclient", "MaxSpeed=6.95"])
    subprocess.check_call(["synclient", "AccelFactor=0.04"])

def set_coasting():
    subprocess.check_call(["synclient", "CoastingSpeed=3"])
    subprocess.check_call(["synclient", "CoastingFriction=12"])

def set_tap():
    subprocess.check_call(["synclient", "TapButton1=1"])
    subprocess.check_call(["synclient", "TapButton2=3"])
    subprocess.check_call(["synclient", "TapButton3=0"])

def set_hysteresis():
    subprocess.check_call(["synclient", "HorizHysteresis=125"])
    subprocess.check_call(["synclient", "VertHysteresis=125"])


def main():
    xinput_out = subprocess.check_output("xinput").split("\n")
    master_pointer_pat = re.compile(r"XTEST\ pointer")
    builtin_nipple_pat = re.compile(r"↳\ TPPS")
    builtin_tp_pat = re.compile(r"↳\ SynPS")
    #magic_tp_pat = re.compile(r"Apple.*Trackpad")
    ### Ubuntu 14.04 doesn't identify this as an Apple, the name is just blank
    slave_pointer_pat = re.compile(r"slave\ \ pointer")
    dev_id_pat = re.compile(r"id=(\d+)")
    master_pointer = False
    synps = False
    nipple = False
    magictp = False
    master_pointer_dev_id = None
    synps_dev_id = None
    nipple_dev_id = None
    magictp_dev_id = None
    for l in xinput_out:
        if master_pointer_pat.search(l):
            master_pointer = True
            master_pointer_dev_id = dev_id_pat.search(l).group(1)
            continue
        if builtin_nipple_pat.search(l):
            nipple = True
            nipple_dev_id = dev_id_pat.search(l).group(1)
            continue
        if builtin_tp_pat.search(l):
            synps = True
            synps_dev_id = dev_id_pat.search(l).group(1)
            continue
        if slave_pointer_pat.search(l):
            foo_dev_id = dev_id_pat.search(l).group(1)
            if foo_dev_id != master_pointer_dev_id and foo_dev_id != nipple_dev_id and foo_dev_id != synps_dev_id:
                magictp = True
                magictp_dev_id = foo_dev_id
                break

    if synps and magictp:
        # turn off built-in only if both built-in and magic
        # trackpad are found
        print("Turning off built-in touchpad (id=%d)" % (int(synps_dev_id)))
        turn_off_tp(synps_dev_id)
            
        set_midbutton()
        set_speed()
        set_coasting()
        set_tap()
        set_hysteresis()


if __name__ == "__main__":
    main()