TCL5947 from python - NOT working

gistfile1.py

#!/usr/bin/env python3

import time
#import spidev
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)

class GPIOOutput:
  def __init__(self, pin):
    self.pin = pin
    GPIO.setup(pin, GPIO.OUT)
    self.low()
    print("just used %d as output" % pin)

  def high(self):
    GPIO.output(self.pin, GPIO.HIGH)
    time.sleep(0.001)

  def low(self):
    GPIO.output(self.pin, GPIO.LOW)
    time.sleep(0.001)

  def __del__(self):
    if GPIO:
        GPIO.cleanup()


# spi = spidev.SpiDev()
# spi.open(0, 0)
#latch = GPIOOutput(17)

def bitbang():
    latch = GPIOOutput(17)
    clock = GPIOOutput(11)
    data = GPIOOutput(10)

    while True:
        try:
            latch.low()

            intensity = 1337
            for output in range(0,24):
                for bit in range(11,-1, -1):
                    clock.low()

                    if intensity & (1 << bit):
                        data.high()
                    else:
                        data.low()

                    clock.high()
            clock.low()

            latch.high()
            latch.low()
        except (KeyboardInterrupt, SystemExit):
            break


def loop():
    while True:
        try:
            latch.low()

            intensity = 1337
            bytes = []
            for output in range(0,24):
                lsb, msb = intensity & 0xFF, (intensity & 0xFF00) >> 8
                bytes.append(msb)
                bytes.append(lsb)
            spi.writebytes(bytes)

            latch.high()
            time.sleep(0.1)
            latch.low()
            time.sleep(0.3)
        except (KeyboardInterrupt, SystemExit):
            spi.close()
            break
    

if __name__ == '__main__':
    # loop()
    bitbang()