I wanted to show you RPIO, an extension of RPi.GPIO with interrupt handling, which I've just uploaded to pypi. This is an example which handles events on 3 gpio pins, each with different edge detection:

import RPIO


def do_something(gpio_id, value):
    print("New value for GPIO %s: %s" % (gpio_id, value))

RPIO.add_interrupt_callback(17, do_something, edge='rising')
RPIO.add_interrupt_callback(18, do_something, edge='falling')

RPIO.add_interrupt_callback(19, do_something, edge='both', threaded_callback=True)
RPIO.wait_for_interrupts()

Besides the new interrupt methods, you can use RPIO just as RPi.GPIO. Note that RPIO uses the BCM gpio numbering scheme by default.

import RPIO


# set up GPIO output channel
RPIO.setup(17, RPIO.OUT)

# set gpio 17 to high
RPIO.output(17, RPIO.HIGH)

# set up output channel with an initial state
RPIO.setup(18, RPIO.OUT, initial=RPIO.LOW)


# set up input channel with pull-up control
#   (pull_up_down be PUD_OFF, PUD_UP or PUD_DOWN, default PUD_OFF)
RPIO.setup(19, RPIO.IN, pull_up_down=RPIO.PUD_UP)

# read input from gpio 19

input_value = RPIO.input(19)

# to change to BOARD GPIO numbering
RPIO.setmode(RPIO.BOARD)

# to reset every channel that has been set up by this program to INPUT with no pullup/pulldown and no event detection

RPIO.cleanup()

The source code is quite compact and works with Python 2.x and 3.x. Easiest way to get RPIO is with pip or easy_install:

sudo pip install RPIO

The source code is published under the MIT license.