input: Write a function to identify the number of even numbers present in a given list of numbers. If the list is empty, return 0.
  def countEvenNum(list):
      return len([x for x in list if x % 2 == 0])
  assert countEvenNum([1, 2, 3, 4, 5]) == 2
  assert countEvenNum([2, 4, 6, 8, 10]) == 5
  assert countEvenNum([1, 3, 5, 7, 9]) == 0
  assert countEvenNum([]) == 0
output: def countEvenNum(list):
      return len([x for x in list if x % 2 == 0])