input: from typing import List
  
  def generate_even_numbers() -> List[int]:
      """ Generate a list of even numbers from 1 to 20 using list comprehension.
      >>> generate_even_numbers()
      [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
      """
output:     return [i for i in range(1, 21) if i % 2 == 0]