input: Write a python function to create a new 'User' instance and a new 'Post' instance associated with that user in Django.
  assert create_user_and_post('Alice', 30, 'My first post', 'This is the content') == ('Alice', 'My first post')
  assert create_user_and_post('Bob', 25, 'Bob's post', 'Content of Bob's post') == ('Bob', 'Bob's post')
  assert create_user_and_post('Charlie', 22, 'Hello World', 'Hello content') == ('Charlie', 'Hello World')
output: def create_user_and_post(username, age, post_title, post_content):
      from django.contrib.auth.models import User
      from myapp.models import Post  # Assuming the Post model is defined in an app named 'myapp'
  
      # Create a new User instance
      user = User.objects.create(username=username, age=age)
  
      # Create a new Post instance associated with the user
      post = Post.objects.create(user=user, title=post_title, content=post_content)
  
      return (user.username, post.title)