input: from typing import List
  
  
  def countEvenNum(num_list: List[int]) -> int:
      """ Counts the number of even numbers in a given list of integers.
      >>> countEvenNum([1, 2, 3, 4, 5])
      2
      >>> countEvenNum([11, 12, 13, 14, 15])
      2
      """
      return len([x for x in num_list if x % 2 == 0])
output:     return len([x for x in num_list if x % 2 == 0])