input: Write a function that prints "Hello World!" five times.
  def print_hello_world():
      for x in range(5):
          print("Hello World!")
  assert print_hello_world() is None
  assert print_hello_world() is None
  assert print_hello_world() is None
  assert print_hello_world() is None
  assert print_hello_world() is None
output: def print_hello_world():
      for x in range(5):
          print("Hello World!")