input: Write a function to create a Python script that adds two numbers together and prints the result.
  def add(a, b):
      sum = a + b
      print(sum)
  
  assert add(5,7) == None # Since the function prints the result, it returns None
  assert add(10,3) == None
  assert add(-1,1) == None
  assert add(0,0) == None
output: def add(a, b):
      sum = a + b
      print(sum)