input: Write a function to identify the number of even numbers present in a given list of numbers. The function should return the count of even numbers. If the given list is empty, it should return 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
  assert countEvenNum([-2, -4, 0, 2, 4])==5
output: def countEvenNum(nums):
      return sum(1 for x in nums if x % 2 == 0)