input: 
  def countEvenNum(list):
      """
      Identifies the number of even numbers present in a given list of numbers.
  
      >>> countEvenNum([1, 2, 3, 4, 5])
      2
      >>> countEvenNum([10, 15, 20, 25, 30])
      3
      """
      return len([x for x in list if x % 2 == 0])
  
output:     count = 0
      for num in list:
          if num % 2 == 0:
              count += 1
      return count