RPi motor drive

"""
RPi   - L273D
Pin 3 - Enable1
Pin 5 - Input1
Pin 7 - Input2
      - Output1 - Motor -VE
      - Output2 - Motor +VE
"""
import RPi.GPIO as GPIO

sef setup():
    GPIO.setmode(GPIO.BOARD)
    GPIO.setup(5,GPIO.OUT)
    GPIO.setup(7,GPIO.OUT)
    GPIO.setup(3,GPIO.OUT)

def forward():
    GPIO.output(5,False)
    GPIO.output(7,True)

def backward():
    GPIO.output(5,True)
    GPIO.output(7,False)

def enable():
    GPIO.output(3,True)

def disable():    
    GPIO.output(3,False)