Command:

login as root: su - root
connect gpio 17 pin and GND pin
echo 17 > /sys/class/gpio/export
echo out > /sys/class/gpio/direction
echo 1 > /sys/class/gpio/value # LED bright
echo 0 > /sys/class/gpio/value # LED dim
echo 17 > /sys/class/gpio/unexport

WiringPi

gpio mode 0 out
gpio write 0 1
gpio write 0 0

WiringPi-python

sudo get-apt install python-dev python-pip
sudo pip install wiringpi
or 
sudo esay_install-2.7 wiringpi
blink.py
import wiringpi
io = wiringpi.GPIO(wiringpi.WPI_MODE_SYS)  
io.pinMode(17,io.OUTPUT)
io.digitalWrite(18,io.HIGH)  # Turn on light
io.digitalWrite(18,io.LOW)  # Turn off

Reference
https://github.com/Gadgetoid/WiringPi2-Python
http://wiringpi.com/