input: 
  def rewrite_with_comprehensions(numbers: List[int]) -> List[int]:
      """ Convert a traditional for-loop append approach to a list comprehension.
      >>> rewrite_with_comprehensions([i for i in range(1,21)])
      [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
      """
      return [i for i in numbers if i % 2 == 0]
  
output:     return [i for i in numbers if i % 2 == 0]