Subject Attribute Inheritance¶

When an EncEntry is added to a Book its subject attribute is set to the same as the Book’s.

If an EncEntry already has a subject an error is raised.

apples_book = Book(title="Apples", subject="Fruit")

red_apples = EncEntry(
    parent=apples_book,
    number=0,
    name="Red Apples",
    text="You can eat red apples.",
)

red_apples.subject == "Fruit"