input: Write a function `print_even_numbers(my_list)` that accepts a list of integers and prints only the even numbers from the list.
  
  assert print_even_numbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])==None
  assert print_even_numbers([11, 13, 15, 17])==None
  assert print_even_numbers([2, 4, 6, 8, 10])==None
  assert print_even_numbers([])==None
output: def print_even_numbers(my_list):
      for num in my_list:
          if num % 2 == 0:
              print(num)