input: Write a python function to generate a random RGB color.
  assert isinstance(random_rgb(), tuple)
  assert len(random_rgb()) == 3
  assert all(0 <= c <= 255 for c in random_rgb())
output: import random
  
  def random_rgb():
      return (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))