Read Launchpad Mini signals

main.py

import os
from subprocess import *
import re

proc = Popen('amidi -p hw:1 --dump', shell=True, stdout=PIPE)

def create_grid(size):
    grid = []
    for i in range(0, size):
        newarr = []
        for j in range(0, size):
            newarr.append(0)
        grid.append(newarr)
    return grid

grid = create_grid(9)

def show_grid():
    for i in range(0, len(grid)):
        row = "|"
        for j in range(0, len(grid[i])):
            row += str(grid[i][j]) + "|"

        print row

show_grid()

regex = "([A-Z0-9]+)\s?([A-Z0-9])([A-Z0-9])\s?([A-Z0-9]+)"
tester = re.compile(regex)

while True:
    data = proc.stdout.readline()
    if len(data) > 0:
        print data
        if tester.match(data):
            matches = re.search(regex, data)
            t = matches.group(1)
            
            if t == "90":
                row = int(matches.group(2))
                col = int(matches.group(3))
                act = matches.group(4)
                if act == "7F":
                    act = 1
                else:
                    act = 0

                grid[row][col] = act
                os.system('clear')
                show_grid()