code: def get_random_range(a, b, randfunc=None):
      
      range_ = b - a - 1
      bits = size(range_)
      value = get_random_integer(bits, randfunc)
      while value > range_:
          value = get_random_integer(bits, randfunc)
      return a + value
docs: getRandomRange(a:int, b:int, randfunc:callable):long
      Return a random number n so that a <= n < b.
  
      If randfunc is omitted, then Random.new().read is used.
  
      This function is for internal use only and may be renamed or removed in
      the future.