Basic GPIO Start | Python Fiddle

#initialize
import time
import RPI.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)
GPIO.setup(23, GPIO.OUT) # Stepo
GPIO.setup(24, GPIO.OUT) # Direction
input_value = GPIO.input(11) # GPIO.HIGH == 1 and GPIO.LOW == 0
int filterValue = 0; # 0 is initialized value
filterWheelIndex = (“startlocation”,“wavelength1”,”wavelenght2”,”wavelength3”)
#print  “Filter Value currently at:”, filterWheelIndex(filterValue)
startLocation()

def startLocation():
	 if input_value == 1:
		print “Intial location found”
		filterValue = 1 # Filter #1 location.
		print  “Filter Value currently at:”, filterWheelIndex(filterValue)
		return 1;
	elif input_value == 0:
		print “Continue Turning”
	else:
		print “Should never hit else” # elif can be replaced with else. assuming no mistakes

def incrementLocation():
	clockwiseRotation():
	filterValue = filterValue +1; # can change to include wavelengths based on filterValue number value
	print “Filter Value currently at:”, filterWheelIndex(filterValue)

def clockwiseRotation():
	GPIO.output(24, GPIO.LOW)
int i = 0
	for 425 >= i:
		if 425 > i:
			GPIO.output(23, GPIO.HIGH)
			time.sleep(2)
			GPIO.output(23,GPIO.LOW)
			time.sleep(2)
			print “step number #”, i 
i = i + 1
		else:
			print “step number #”, i
			return 1

def decrementLocation():
	counterclockwiseRotation ():
	filterValue = filterValue - 1; # can change to include wavelengths based on filterValue number value
	print “Filter Value currently at:”, filterWheelIndex(filterValue)

def counterclockwiseRotation():
	GPIO.output(24, GPIO.HIGH)
int i = 0
	for 425 >= i:
		if 425 > i:
			GPIO.output(23, GPIO.HIGH)
			time.sleep(2)
			GPIO.output(23,GPIO.LOW)
			time.sleep(2)
			print “step number #”, i 
i = i + 1
		else:
			print “step number #”, i
			return 1

Python Fiddle

Python Cloud IDE