แก้ AttributeError: 'module' object has no attribute 'setmode' ใน GPIO

sudo easy_install -U RPi.GPIO
or

Discovered the problem:
Some guides online instruct you do download version 0.1.0 of the GPIO library which does not have the setup function. You must use a more recent version of the library.

RPi.GPIO-0.1.0.tar.gz

I have downloaded version 0.5.x and it works correctly.

RPi.GPIO-0.5.3a.tar.gz

Download from here https://pypi.python.org/pypi/RPi.GPIO
or Download from here http://code.google.com/p/raspberry-gpio-python/downloads/list

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Installation Instructions
Extract the script

tar -zxvf RPi.GPIO-0.5.3a.tar.gz
cd RPi.GPIO-0.5.3a
sudo python setup.py install