UpyCraft-micropython: microbit控制RGB

from microbit import *
import random
num = 0 
flag = True

while True:
  if flag == True:
    num += random.randint(1,20)
    if num > 255:
      flag = False
  elif flag == False:
    num -= random.randint(1,20)
    if num < 20:
      flag = True  
  
  pin0.write_analog(num)
  pin1.write_analog(num)
  pin2.write_analog(num)
  print(num)
  sleep(100)
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