How to use interrupts with Python on the Raspberry Pi and RPi.GPIO

Install RPi.GPIO version 0.5.1a for multiple threaded callback interrupts

If you need to, you can install 0.5.1a or later with
sudo apt-get update
sudo apt-get dist-upgrade (This will update all your Raspbian packages and may take up to an hour)

or, from the command line prompt (this will only update RPi.GPIO)…
wget http://raspberry-gpio-python.googlecode.com/files/python-rpi.gpio_0.5.1a-1_armhf.deb
wget http://raspberry-gpio-python.googlecode.com/files/python3-rpi.gpio_0.5.1a-1_armhf.deb
sudo dpkg -i python-rpi.gpio_0.5.1a-1_armhf.deb
sudo dpkg -i python3-rpi.gpio_0.5.1a-1_armhf.deb

http://raspi.tv/2013/how-to-use-interrupts-with-python-on-the-raspberry-pi-and-rpi-gpio-part-3