Python object model, as well as :term:`database metadata` that describes
real SQL tables that exist, or will exist, in a particular database::
+ >>> from typing import List
>>> from typing import Optional
>>> from sqlalchemy import ForeignKey
>>> from sqlalchemy import String
... name: Mapped[str] = mapped_column(String(30))
... fullname: Mapped[Optional[str]]
...
- ... addresses: Mapped[list["Address"]] = relationship(
+ ... addresses: Mapped[List["Address"]] = relationship(
... back_populates="user", cascade="all, delete-orphan"
... )
...