Freezing with no error codes using non-standard library

Question

I'm doing some work with a MIDI controller called the Novation Launchpad that has a python module available to import and use.

My code keeps getting stuck on the line LP = launchpad.Launchpad(). So here is how I've attempted to de-bug:

import launchpad
print "I've started"
LP = launchpad.Launchpad()
LP.Open()
print "I worked!"

The programme never prints I've worked so I know my issue is in the creation of the Launchpad instance.

Using a friends laptop we've had no issues. I've had intermittent issues with it working and not working and really don't even know where to start looking!

Answer 1

So, after finding a programme that would run with those commands, it became clear quickly that I hadn't initiated pygame and pygame.midi.

import pygame, pygame.midi, launchpad

pygame.init()
pygame.midi.init()
print "I've started"
LP = launchpad.Launchpad()
LP.Open()
print "I've worked"

Will run just fine.